Geek Stuff

Brooke Clarke 2013 - 2021

Background
Theremin
Electronic Goldfish in a Bowl
Fireflies in a Jar
Butterfly on a string
Zendulum
Mova Globe
Plasma Globe
Drinking Bird
Magnetic Levitating Lamp
    500g Magnetic Levitation module
Metal Earth Monarch
    Tools for Metal Earth
Electrically Operated Coin Box Device aka Thing Magic Hand
Diamond Tester
Chess Sets & Board Games
Links

Background

There are some thing's I'm find interesting but that I'm not going to spend my life pursuing.

Theremin

The Theremin (Wiki)  is an electrical musical instrument played by using one hand to control the pitch and the other to control the volume.  Since both controls depend on the capacitance between the hand and instrument sensing antenna, any body movement other than the hand will be heard.  So you will notice that the performer is holding very still except for the hand movements. Pamelia Kurstin plays the theremin (TED, YouTube)

Although I would like get a full size theremin, they are priced way too high for what use I'd make of it.  So when a "toy" theremin showed up at http://www.thinkgeek.com I waited till they were back in stock and got one.

The theremin was originally the product of Russian government-sponsored research into proximity sensors by Lev Sergeevich Termen (Wiki).
1661058 Method of and Apparatus for the Generation of Sounds, L.S. Theremin (M.J. Goldberg and Son, G.M.B.H Germany), Feb 28, 1928, 84/674; 84/711; 331/37; 331/40; 331/55; 331/65; 331/181; 340/384.72; 984/383

1658953 Signaling Apparatus, L.S. Theremin, Feb 14, 1928,
340/562; 236/74.00R; 236/DIG.11; 246/2.00R; 246/63.00R; 246/249; 307/652; 331/176; 334/6; 336/30; 336/75; 340/590; 340/592; 361/1; 361/161; 361/181; 361/282; 455/120- any movement in a room will set off the alarm

2047912 Timing System, L Theremin, Jul 14, 1936,  307/2; 368/52; 968/827 - synchronous clock run on DC

Also see my Music web page.

Book: Theremin: ETHER MUSIC AND ESPIONAGE by Albert Glinsky, ISBN-13: 978-0252072758
Also see my music web page for other references.

Fig 1 Kit as received
Theremin

Fig 2 magazine all about Theremins (Japanese?)
Theremin



Electronic Goldfish in a Bowl

Runs on 3 AA batteries or an external wall wart.
Electronic Goldfish in a Bowl

Fireflies in a Jar

The jar has frosted glass and as the LEDs inside dim and brighten it appears that there's movement.

Butterfly on a string (Solar Wobble Butterfly)

From a distance it looks like a real butterfly when near a plant.  Can add a AA battery, but it's not required.  Not sure why you'd want to use one.
The plastic stakes are very fragile, i.e. they will break if you try to force them into the ground.  You need to have a hole first then insert the stake.

Butterfly on a string (Solar Wobble Butterfly)

Zendulum

A Zen Pendulum.  A magnetic ball generates an electric current when it passes over a coil that triggers the discharge of a capacitor giving it a small kick to keep it going.
Powered by a small solar cell or by a mini USB jack.  The black acrylic plastic has been laser cut, a neat idea.

The solar cell is an assembly made by Solarbotics who made this kit.  It has a printed circuit board on the back intended for one of their other kits.
The other kits use one of the MN1381 voltage triggers (MSE solar cell combo), like the MSE2 Powerful bundle kit.  The solar cell charges a big capacitor and when the cap voltage reaches the trigger point the 1381 grounds a terminal transferring the storage cap power to the load, which can be a small motor.

This works using the idea from an old patent "Novelty Electric Motor" from 1974, see Joule Thief web page and scroll down for other examples.

There are a couple of errors in the instructions.
Step 8 - use the 1/2" screws, not the 1/4".
Step 10 - save the left over double sided tape, it will be used to stick the solar cell to it's mount.

By turning off the switch and letting the ball come to a stop as pictured in the photo below a "+" mark can be made on the top.
Now, after moving the "+" mark 90 so it's facing forward the switch can be turned on and the ball given a slight nudge.
After running for a number of cycles and switch is turned off.
The "+" mark is either at or near the top.

Note:  This electrical circuit has a lot in common with the Joule Thief.

Zendulum top
Zendulum bottom https://youtu.be/PEMa5ySuc5E

An early version of this that used classical pendulum with a magnet on the tip is in Chapter 11 of the book: Junkbots, Bugbots & Bots on WHeels: Building Simple Robots with BEAM Technology by Hrynkiw and Tilden.  This book has a neat idea they call the Miller Solar Engine that uses a microcontroller voltage dropout detector IC to allow a solar cell to charge a capacitor that may have application to the Joule Thief idea of recovering energy.

If the ball is left on the rails and the Sun goes down the ball ends up in the center as pictured above.  The next day when there's light, but not direct Sun the ball and coil act like a loudspeaker and makes a faint beep that can take some time to track down.  This unit is NOT self starting, so even when in direct Sun the ball will not start moving, but just make the faint beep.

Mova Globe (MovaGlobes.com)

Mova Globe
It does turn from room lighting.  So far have not got it under overhead sun.
Maybe in half a year (Now December 2018 so Sun is low in the sky).
A sphere, like a map of Earth, spins inside a clear plastic sphere for ever.  Solar powered, so needs a lot of light to spin.
4.5" Blue with Relief Map on order 2018 December 1.
6937125 Self
                  rotating display spherical device, William W. French,
                  1999-10-18 - 6853283 Frictionless self-powered moving display, William W. French, 1999-10-18 - Original method
6937125 Self
                  rotating display spherical device, William W. French,
                  1999-10-18 -
6937125 Self rotating display spherical device, William W. French, 1999-10-18 -alternate methods

1856514 Electrical top, Loyd L Sheneman, 1932-05-03, 446/259 446/484 310/46 - runs on a grid of squares alternating + and -.

  Bill French YouTube:  Mova Origins, Mova Globe origins and operation
Mova Globe : Internal Mechanism Revealed by Cutting Open -

Media appearances:
Extant (IMDB): Black star map version on same base as mine appears on the desk of  Sam Barton (Camryn Manheim), Episodes 1, 6, 

Plasma Globe

This is the 8" size with a AC line power supply.  There are larger and smaller sizes and some of the smaller ones run from a battery.

Plasma Globe
This still photo does not capture the motion or the effect when a hand is placed on the globe.
Here is a movie showing the motion: https://youtu.be/rKxu1DK-WZQ


The Wiki page shows a Tesla patent  but Bill Parker is the inventor of this device.
454622 System Of Electric Lighting, N. Tesla, 1891-06-23 - >= 15 kHz & >=29kV AC drive
514170 Incandescent electric light, N. Tesla, 1894-02-06 - insulates the wire inside the globe, only the ball is exposed

The Parker patents are all for a hemispherical dome, but the actual product is close to a spherical globe.

 
4963792 Self
                  contained gas discharge device, William P. Parker,
                  Lahive & Cockfield, 1990-10-16 Plasma Globe
4963792 Self
                  contained gas discharge device, William P. Parker,
                  Lahive & Cockfield, 1990-10-16 Plasma Globe 4963792 Self contained gas discharge device, William P. Parker, Lahive & Cockfield, 1990-10-16
4754199 Self
                  contained gas discharge device, William P. Parker,
                  Lahive & Cockfield, 1988-06-28 Plasma Globe
                  gasses
4754199 Self contained gas discharge device, William P. Parker, Lahive & Cockfield, 1988-06-28
Table 1 possible gas mixtures


D322489 Decorative gas plasma light display, William P. Parker, Lahive & Cockfield, 1991-12-17

Drinking Bird

The Drinking Bird (Wiki) is something that moves and is energy efficient.  These are on eBay for under $10 including shipping.  "Drinking Bird" are the search terms, maybe "magic".

Fig 1 No adjustments needed.  Just install with head and feet pointing the same way.
Drinking Bird



Fig 2 The head is made of porous material that gets soaked with water
Drinking Bird



250821 Oscillating
                  motor, I. L. Landis, Dec 13, 1861, 60/675

250821 Oscillating motor, I. L. Landis, Dec 13, 1861, 60/675
253868 Motor, A.
                  & A. Iske, 1882-02-21, 60/675
253868 Motor, A.
                  & A. Iske, 1882-02-21, 60/675 253868 Motor, A. & A. Iske, 1882-02-21, 60/675 -
2384168 Activated
                  amusement device, Arthur M Hillery, 1945-09-04,
                  60/641.6; 60/675; 446/304; D21/812; 40/406; 446/87
2384168 Activated amusement device, Arthur M Hillery, 1945-09-04, 60/641.6; 60/675; 446/304; D21/812; 40/406; 446/87 -
2402463 Novelty
                  device, Miles V Sullivan, 1946-06-18, 446/199; 40/406;
                  159/906
2402463 Novelty device, Miles V Sullivan, 1946-06-18, 446/199; 40/406; 159/906


Magnetic Levitating Lamp

With the power off, after plugging in the power pressing the touch switch does nothing.  In order to turn the unit on, the lamp must first be removed, the switch pressed then the lamp slowly brought back to the balance point.
When the power (12 VDC <= 1 Amp) is turned off the lamp jumps up.  That's to say the active magnetic circuit is pressing the lamp down and permanent magnets are pulling it up.

Note the "lamp" uses the new (2019) linear LED "filaments" and it rotates when on.

Fig 1 Mova Globe, Levitating lamp,
Plasma Globe, Novelty Electric Motor,
the Swinging Sticks Kinetic Sculpture is
just off camera to the right.
Magnetic
                  Levitating Lamp


Levitron Arts is the patent holder.

500g Magnetic Levitation module

Patents

3215901 Method and device for maintaining stationary position of a ferromagnetic body freelyfloating in electromagnetic field, Carniol Bohdan, 1965-11-02 - ferromagnetic rotor of an ultra-centrifuge, freely floats in the magnetic field of an elect-romagnet, coils above and below rotor. (but no to have a gap visible)
4585282 Magnetic levitation system, Robert W. Bosley, Levitron Intl, Filed: 1983-07-19, Pub: 1986-04-29 - active circuit Fig 1 coils above and below, but later figures show only bottom coil.
4910633 Magnetic levitation apparatus and method, Louis P. Quinn, 1990-03-20 - a magnet is held by an electromagnet above it, uses a sensor and variable lift adjustment to control gap, low cost, plans on internet, but touchy to get working.
5168183 Levitation system with permanent magnets and coils, Lorne A. R. Whitehead, University of British Columbia, 1992-12-01 - complex
YouTube: Inventing the Gravitron (LEVITRON From-Below Electromagnetic Levitator) -
YouTube: Levitation Arts Levitating Light Bulb - support from below
YouTube: 2017: A MOUSE ODYSSEY - mouse climbs on floating disk (note: www.floatingstuff.com forwards to levitationarts.com)
YouTube: LEVITRON / GRAVITRON Technology From Levitation Arts
5218257 Magnetic levitation self-regulating systems, Oleg Tozoni, Maglev Tech Inc, 1993-06-08 - for trains all PMs
5404062 Magnetic levitation device and method, Edward W. Hones, William G. Hones, Creative Gifts Inc, 1995-04-04 - a PM top is spun over a PM square sheet then, using a non-magnetic lifter plate the top is raised.  It will then hover for a little while.
5883454 Electormagnetic drive method and apparatus for driving a rotationally stabilized magnetically levitated object, Edward W. Hones, William G. Hones, Creative Gifts Inc, 1999-03-16 - spinning top floats for a while
6275127 Solar powered magnetic support for display, William Wallace French, 2001-08-14 -
6373676 Magnetic floatation control system,William Baker JohnSpan Inc (Hewlett-Packard),
7348691 Magnetic levitation apparatus, Harold Davis, Lorne Whitehead, Levitation Arts Inc, Filed: 2003-09-29, Pub: 2008-03-25 - much simpler 39 claims
7505243 Magnetic levitation apparatus, Harold Davis, Lorne A. Whitehead, Levitation Arts Inc, 2009-03-17 - 25 claims
WO2010150207A1 Floating lamp, Eberhard Waffenschmidt, Peter Visser, Philips, 2010-12-29 - floats above base, LED

Metal Earth Monarch

Metal Earth makes laser cut metal "bend the tabs" type 3D model objects.  I got the Monarch to see if the colors shown were part of the kit. (they are)

Assembly Tips

1. Be sure you do not cut metal sheet when opening envelope.
2. It's not clear how to best separate the parts from the sheet. (Flush Cutters)
3. I used a stereo zoom microscope and tweezers to do the assembly.
3. When a box is around some parts assemble these parts into a sub-assembly before any other assembly.
4. When doing a "tab only" bend to attach two parts look for a notch on the non tab part to be sure you have them properly aligned.

YouTube:
Fascinations Metal Earth Model Kit Basics - TOOLS -
 Fascinations Metal Earth Kit BASICS - tweezers, flush cutters, jewelers screwdriver, needle nose pliers - he says assembly proceeds by part number, but that is not the case for the Monarch.
Q-tip and alcohol to remove finger prints.

Fig 1 Front of package.
Notice you can see metal sheet at top and in triangle notch at bottom left.
This is important when you cut envelope to remove metal sheet.
Metal Earth
              Monarch
Fig 2 Limited instructions.
Metal Earth
                Monarch
Fig 3 Metal sheet
Metal Earth
              Monarch
Fig 4 Assembled.
Metal Earth
                Monarch

Tools for Metal Earth

From the video above.

Fig 1 Tools shown with Metal Earth Dozer (3 sheets)
Tools for
                  Metal Earth
Fig 2
Tools for
                  Metal Earth

Electrically Operated Coin Box Device aka Thing Magic Hand

Found this while searching all the patents in class 446/484 Amusement Devices: Toys/Electric
Also see Money - Coins & Locks Coin Banks  

Photos

Fig 1 US Patent 3243914
Electrically
                  Operated Coin Box Device aka Thing Magic Hand
Fig 2
Electrically
                  Operated Coin Box Device aka Thing Magic Hand
Fig 3
Electrically
                  Operated Coin Box Device aka Thing Magic Hand
Fig 4
Electrically
                  Operated Coin Box Device aka Thing Magic Hand


3243914
3243914
                  Electrically Operated Coin Box Device, Donald B
                  Poynter, April 5, 1966, 446/9 446/484 472/71 194/310
                  472/70 -
3243914
                  Electrically Operated Coin Box Device, Donald B
                  Poynter, April 5, 1966, 446/9 446/484 472/71 194/310
                  472/70 -

3243914 Electrically Operated Coin Box Device, Donald B Poynter, April 5, 1966, 446/9 446/484 472/71 194/310 472/70 -
Grabs coin and drops it into box.  To retrieve coins open lid and dump them out.  You will need something thin to pry lid open.

Packaged in a box marked:  "The Thing from The Adams Family" (Wiki).

Foot (35) shakes box while hand is reaching for coin.

The Poynter Products company was formed later.
3244420 Miniaturized basket-ball backboard, Donald B Poynter, Poynter Products Inc, 1966-04-05, - mount over wastebasket
4300473 Device for moistening the adhesive coating on postage stamps and envelopes, Donald B Poynter, Poynter Products Inc, 1981-11-17, - similar to 3243914 except a wet tongue comes out of the box.
4432542 Joke cigarette lighter, Donald B Poynter, Poynter Products Inc, 1984-02-21, - looks like BIC lighter (Wiki) but shoots out foam spaghetti that can not be stopped.  A one time use item.
5004122 Article dispensing package, Donald B Poynter, Poynter Products Inc, 1991-04-02, - Looks like gumball machine, but is a slice of one and mounts on wall.

There were many more Pouynter Products that were not patented.  eBay: "Poynter"
3512298
3512298 Coin return
                  amusement device, Donald B Poynter, May 19, 1970,
                  446/9 446/484
3512298 Coin return
                  amusement device, Donald B Poynter, May 19, 1970,
                  446/9 446/484

3512298 Coin return amusement device, Donald B Poynter, May 19, 1970, 446/9 446/484 - rejects coin, throws it back
5299671 Coin
                  exchanger, Clifford Garland, Apr 5, 1994, 194/310;
                  446/9; 453/41



5299671 Coin exchanger, Clifford Garland, Apr 5, 1994, 194/310; 446/9; 453/41 - takes in one coin, outputs a different coin

Diamond Tester

First saw this on BigClive.com's YouTube: Inside a diamond tester. (thermal conductivity) - "Diamond Selector II"
eBay title:
"NEW LED V2 Jewelry Diamond Gemstone Gems Tester Selector Tool + Battery w SGV" under $10.
A better choice would be to get both the Diamond and Moissanite tester set of 2 testers for under $15.

Patents

The key methods are thermal conductivity, electrical resistance/conductivity and optical transmission/absorption/emission.  Some of the electrical conductivity testers use 1,000 VDC with current limiting.

6265884 Electrical conductivity gem tester, Solomon Menashi, David Barrett, Wayne Duderwick, Randolph M. Bogdan, CERES Crystal Industries Inc, 2001-07-24, 324/717; 324/693; 324/71.1; 324/722 - 1,000 VDC limited to 33uA.
Cites:
Publication number  Priority date  Publication date  Assignee  Title
US3944922A1973-10-15  1976-03-16  The Parc-Amber Company Limited  Resistivity measuring heads - semiconductors
US4255962A1978-04-10  1981-03-17  Ceres Corporation  Method and means of rapidly distinguishing a simulated diamond from natural diamond - Thermal conductivity
US4324129A1979-03-28  1982-04-13  Unisearch Limited  Method and means for distinguishing gemstones - gem becomes part of a thermoelectric generator
US4344315A1978-12-29  1982-08-17  Ceres Electronics Corporation  Method and device for distinguishing material by thermal conductivity - Thermal conductivity
US4364677A1978-04-10  1982-12-21  Ceres Electronics Corporation  Method and means of rapidly distnguishing a simulated diamond from natural diamond - Thermal conductivity by heating probe tip then touching the gem and watching how fast the tip cools.
US4488821A1981-03-03  1984-12-18  Ceres Electronics Corporation  Method and means of rapidly distinguishing a simulated diamond from natural diamond
US4616939A1984-05-23  1986-10-14  Meir Gitlis  Apparatus for testing diamonds - enhanced thermal conductivity by using LM339 voltage reference
US4646571A1985-02-11  1987-03-03  Krautkramer- Branson, Incorporated  Method and apparatus for hardness measurement - hardness
US4841764A1987-11-07  1989-06-27  Helmut Fischer  Device for a hardness measuring instrument - hardness
US4898470A1988-07-12  1990-02-06  Eastman Kodak Company  Apparatus and method for testing circular cylindrical or conical surfaces - optical
US4906083A1987-05-21  1990-03-06  Sattler Hans Eberhard  Apparatus for examining gemstones and the like - microscope with dark-field illumination
US5052819A1989-06-12  1991-10-01  Baratta Francis I  Method of and apparatus for nondestructively determining the composition of an unknown material sample - thermal test for grade 8 bolts
US5118181A1989-10-27  1992-06-02  Wellborn Ltd.  Method and apparatus for identifying gemstones, particularly diamonds - UV or IR radiation and measuring the spectrum emitted
US5317275A1992-01-13  1994-05-31  Orbital Sciences Corporation  Conductance measurement circuit with wide dynamic range - aimed at bacteria, but could be used on diamond
US5358596A1992-07-02  1994-10-25  The Board Of Trustees Of The Leland Stanford Junior University  Method and apparatus for growing diamond films - allows growing real diamond on top of fake diamond
US5379102A1991-12-24  1995-01-03  E.R.C. Company Ltd.  System for identifying jewels - bench top system of microscope, and PC
US5450745A1994-07-29  1995-09-19  Flaherty; Frank  Edge strength tester
US5533411A1992-06-25  1996-07-09  Hitachi Construction Machinery Co., Ltd.  Method and apparatus for nondestructive testing of physical characteristics of a specimen using ultrasonic waves
US5536943A1992-05-19  1996-07-16  Gersan Establishment  Method and apparatus for examining an object - optical transmission at 254 & 365nm compared.
US5559436A1994-11-21  1996-09-24  Marion Matthews  Method and apparatus for distinguishing synthetic diamonds from natural diamonds - the diamond (no metal) is placed in an air core inductor and the change in frequency measured.
US5603414A1992-06-03  1997-02-18  Gersan Establishment  Detecting diamonds in a rock sample - X-ray method used for mining not gems
US5620253A1995-07-31  1997-04-15  Lucent Technologies Inc.  Method of determining the thermal resistivity of electrically insulating crystalline materials - uses thermal resistance & optical transmission
US5664884A1995-07-31  1997-09-09  Lucent Technologies Inc.  Apparatus for determining the thermal resistivity of electrically insulating crystalline materials - uses thermal resistance & optical transmission
US5703288A1995-07-19  1997-12-30  Ricoh Company, Ltd.  Thermally-sensitive type flow meter having a high accuracy
US5748317A1997-01-21  1998-05-05  Brown University Research Foundation  Apparatus and method for characterizing thin film and interfaces using an optical heat generator and detector
US5756893A1995-06-14  1998-05-26  Nippondenso Co., Ltd.  Thermal flow meter - heaters and temperature sensing based
US5801819A1994-09-02  1998-09-01  Gersan Establishment  Distinguishing natural from synthetic diamond - UV flash lamp -> phosphorescence measured (long is fake)
US5807523A1996-07-03  1998-09-15  Beckman Instruments, Inc.  Automatic chemistry analyzer -using a nephelometer (Wiki).  My Rabbit Air filter uses one of these.
US5811824A1994-01-25  1998-09-22  Gersan Establishment  Method and an apparatus for testing whether a diamond has a layer of synthetic diamond deposited thereon
US5811817A1996-04-25  1998-09-22  Ravich; Gilbert Norman  Method & apparatus for detecting fracture filled diamonds
US5835200A1990-04-24  1998-11-10  Gersan Establishment  Method and apparatus for examining an object - based on UV transmission
US5835205A1996-02-12  1998-11-10  C3, Inc.  Optical testing system for distinguishing a silicon carbide gemstone from a diamond - based on UV transmission
US5844684A1997-02-28  1998-12-01  Brown University Research Foundation  Optical method for determining the mechanical properties of a material
US5880504A1994-09-07  1999-03-09  Gersan EstablishmentExamining a diamond - max absorption at 415.5 nm
US5955735A *1997-09-29  1999-09-21  C3, Inc.  Apparatus and method for positively identifying synthetic silicon carbide gemstones - using lingt transmission around 350 nm-370 nm

Cited by:
Publication number  Priority date  Publication date  Assignee  Title
US6439766B1 *2001-02-06  2002-08-27 Oris L. Nelson Diamond detecting apparatus and method
EP1378748A1 *2002-07-05  2004-01-07 Wetenschappelijk en Technisch Onderzoekscentrum voor Diamant Method and device for discriminating between real and fake gemstones based on electrical conductivity measurements
US20050141588A1 *2002-04-19  2005-06-30  Mark Robertson  Method and apparatus for assessing the integrity of a jewellery setting
US20050206388A1 *2003-12-30  2005-09-22  Quint Jonathan B  Battery management system and apparatus with anomaly reporting
US20060087306A1 *2004-10-18  2006-04-27  Boris Zolotar Loginov  Gem tester using electrical photo conductivity
US20060176046A1 *2005-02-07  2006-08-10  Walker Jason A  Power meter for biasing an audio amplifier
US20080078677A1 *2005-11-11  2008-04-03  Chua Yih J  Testing Device For Precious Metals
US20090070236A1 *2005-05-21  2009-03-12  Ehud Cohen  Diamond and Precious Stone Trading Platform with Funding and Delivery Transparency
US20090281928A1 *2003-12-30  2009-11-12  Quint Jonathan B  Battery management system with runtime reserve analysis
US20100138167A1 *2007-04-27  2010-06-03  Panasonic Corporation  Flow rate measurement apparatus, program thereof, flow rate measurement method, and fluid supply system
US20120007619A1 *2010-07-09  2012-01-12  Xiuling Zhu  Multi-functional precious stone testing apparatus and method thereof
US20120049836A1 *2010-06-21  2012-03-01  Kessler Daniel L  Gem Tester
US8833635B1 *2011-07-28  2014-09-16  Us Synthetic Corporation  Method for identifying PCD elements for EDM processing
US20150091593A1 *2011-02-16  2015-04-02  Shenzhen DiKai Industrial Co., Ltd.  Multi-Functional Precious Stone Testing Apparatus and Method Thereof
US9037430B1 *2009-07-07  2015-05-19  Us Synthetic Corporation  Methods and systems for non-destructively testing a polycrystalline diamond element
US20160161420A1 *2011-02-16  2016-06-09  Shenzhen DiKai Industrial Co., Ltd.  Multi-Functional Precious Stone Testing Apparatus and Method Thereof
US9395350B2  2010-06-21  2016-07-19  Sy Kessler Sales, Inc.  Gem tester
US10161878B2  2015-08-12  2018-12-25  Jubilee Diamond Instrument (S) Pte. Ltd.  Diamond identification apparatus
US10228330B2  2016-06-01  2019-03-12  Jubilee Diamond Instrument (S) Pte. Ltd.  Precious stone testing device
8278906 Apparatus for simulating thermal conductivity and electrical resistance of diamonds and their substitutes, Boris Z. Loginov, Leonid Radomyshelsky, Tri Electronics Inc, 2012-10-02, 324/71.1; 324/693; 324/717 - A way to make something that has the thermal and electrical characteristics of diamond, moissanites or cubic Zirconia using common low cost materials.
Cites:
Publication number  Priority date  Publication date  Assignee  Title
US4255962A *1978-04-10  1981-03-17  Ceres Corporation  Method and means of rapidly distinguishing a simulated diamond from natural diamond - Thermal conductivity
US20060087306A1 *2004-10-18  2006-04-27  Boris Zolotar Loginov  Gem tester using electrical photo conductivity
Cited by:
Publication number  Priority date  Publication date  Assignee  Title
US20120049836A1 *2010-06-21  2012-03-01  Kessler Daniel L  Gem Tester
US20150233740A1 *2012-09-17  2015-08-20  Presidium Instruments Pte Ltd. a corporation  Analysis tool member
US9395350B2  2010-06-21  2016-07-19  Sy Kessler Sales, Inc.  Gem tester
US10161878B2  2015-08  122018-12-25  Jubilee Diamond Instrument (S) Pte. Ltd.  Diamond identification apparatus
US10228330B2  2016-06-01  2019-03-12  Jubilee Diamond Instrument (S) Pte. Ltd.  Precious stone testing device

Chess Sets & Board Games

Chess

While I can play chess (Wiki) my skill is so low that I don't know how to specify my rank.
I very much like some chess sets because of the design.  Some of these I've owned in the past.

Wood Chess Set Weighted Pieces Majestic Staunton Ebony/Boxwood 4"+2 Extra Queens


I wanted a set where the Bishop's mouth was more open than on the common Staunton (Wiki) sets.  This one still is not as open as the one shown on the Wiki Page.
From eBay seller houseofchess_store
The King is 4.1" (104mm) tall with a base diameter of 1.79" (45mm) and weights 2.6 oz (74g) [1.79" is 3/4 of 2.4" square, or 80% of a 2.24" square]
Note that the standard height of the king for tournament play is 3-3/4".  House of Staunton: The Leeds Series Luxury Chess Pieces - 3.75" King, MENWLED375
8 * 2-1/4" = 18" + border ~22" overall board size?
The Chess.com web page: Chess Board Dimensions | Basics and Guidelines‎ -

square size should be anywhere from 2 inches to 2.5 inches (World Chess Federation (FIDE): 1.97" to 2.36")
king's height
 should be 3.375 inches to 4.5 inches (World Chess Federation (FIDE): 3.74")
These pieces are weighted to the point that they will stand up if the head is lifted up maybe a inch.  The weight is also attracted to a magnet.
Jaques
                    Cook Staunton Chess Set from Wiki
Photo from web page:
https://en.wikipedia.org/wiki/Staunton_chess_set

Note the open mouth on the Bishop.

Fig 1 King
Wood Chess
                    Set Weighted Pieces Majestic Staunton

Fig 2 Bishop
half open mouth
Wood Chess
                    Set Weighted Pieces Majestic Staunton







Go

 (Wiki) is an interesting game and there are boards made very solid so that when a stone is put down it makes a nice sound also to keep vibrations from moving the stones as someone walks by.  Note the board at the top of the Wiki page.

Backgammon

Links

L & A St. Leger - Automata & Miniatures
Dark Roasted Blend: Weird & Wnderful things -

Back to Brooke's PRC68, Alphanumeric List of Web Pages, Products for Sale,  Electronics, page

page created 7 April 2013.