Harold "Doc" Edgerton

© Brooke Clarke 2016

Background
Description
Table
People
Patents
Related
Links

Background 

Started this page mainly to add an index to the MIT Edgerton Notebooks web page which has none.
I want to find out about W.W.II aircraft 50kW strobes and about how the flash duration is controlled.
Started shortly after the GR Strobotac web page.

Description

First make a table listing all of them.

Table

There are four naming conventions for the notebooks.  The double letter series, T-n series, the Ln series and the nn series.
The dates can overlap between the different series and even between succssive notebooks in the same series, at this point do not know the meaning of the three series.

I've moved the date range to the left coulmn since that's the order used on the MIT web page.
The link on the date range is for the complete pdf notebook, the series link is to the web page.

Date Range aa
T-n
Ln
nn
Topic
Sep 1927 - Jul 1931
T-1

Hg lamp Stroboscope
Feb 1930 - Jun 1931


03
discovery of thrytron light flashes
when working with synchorous motors
Jul 1931 - Jan 1932 aa


Hg lamp strobe, Interference 76,771, Edgerton v. Miller (1940)
Jul 1931 - Jan 1932 bb



Jan 1932 - Jul 1933
T-3





B1

Germeshausen bk 1
Feb 1932 - Feb 1934

G2
Germeshausen bk 2
Interference 76,771, Edgerton v. Miller (1940)
measure 8uS flash using bromide paper on wheel rim PG13
Mikl drop photos @ 480 fps pg21
Spark Gap strobes pg28 . . .
Development of Hg tubes
Start of bullet photos pg59
Neon, helium & argon gas pg63
Neon Tube Eureka!! pg65

Jun 1933 - Nov 1934
T-4


Oct 1934 - Aug 1935
T-5


Apr 16, 1935 - Jan 23 1937 cc



Aug 1935 - Apr 1936

T-6


Apr 1936 - May 1937



07

Jun 1937 - May 1937



08

Apr 1938 - Jun 1939



09

Jul 1938 - Jul 1939


B1

Jun 1939 - Sep 1940



10
analysis of M1 Grand rifle bolt action pg34
graph of ball and Armor Piercing rounds pg 34b
idea for book "Flash" 1939 pg38
Hummingbird photos
jumprope, cards, back flips
Sep 1940 - Dec 1941



11
Testing strobe on blue background 2000V 112 uF pg3
Testing RCA 929 photo cell & strobe light meter circuits pg5
need to measure separately background & flash levels, meter includes flash firing pg7
Bellows Falls, VT hydro gen testing pg8
boy's portrait setup photograph pg8b
Bellows Falls traces and man w/tie & hands photos pg9
Spiral lamp @ 2kV & 4,000 uF - photo across Charles river pg10
Photo shows MIT chimneys @ 1500 ft. pg11
Details of pg11 photos
photo with streaks & scratches pg13
using a microphone to trigger flash for testing loom pg14
Taking photo @ 200 MPH & 3500 ft for camouflage requires strobe pg15
Loom shuttle thoughts pg16
5000 dozen Kodatron flash tubes sold already
Nov '40 - photos at NCR (4-rotor NCR enigma started in '42) so doing what? pg17
30 Nov '40Photo of football game shoing shadow from Big Strobe pg18
2kV - 112 uF spectrum (relation to camo?) pg 18b, c, 19
notes on tank photos & photo of acrobats pg22
diagram for bullet through plate w/ dual cameras pg23
High speed shutter = motor spins disk with hole pg24
Dec 30 '40 party photo pg25
photo of setup for bullet into plate pg27
Photo of 8" shell 1797 ft/sec pg28
wet Battery Portable speedlight ckt pg29
" camera trip method ckts pg30
 Jan '41 wire in tension trigger pg35
Model 52 Winchester .22 rifle photo (strings?) pg41
another string photo pg42
photo men looking at "Flash" magazine
photo of 9 men pg47
Method of speeding up flash time by doubling voltage, 2kV 4000uF pg48
" photos mounted on truck
Kodatron pricing pg50
Boxing photos pg51
2 photos taken with "portable" pg52
photo of Joe Costa museum exhibit pg53
plug-in strobe lamp safety ckt pg54
photo Ed holding portable battery box pg56
Kodatron Imax vs LOG(C) is linear pg58
Dec 1941 - Aug 1942



12
microscope flash pg03
Aug 1942 - Mar 1943



13
Quartz tubes made by GE for aircraft use
Aeiral photo from 5,000 ft (f3.5, Tri-X, 13.5" lens 1942 pg17
Aerial flash tube 2000 mF, 4000V, 6 sec interval pg18
8V Bat Portable Speed-Lamp pg81
AC line powered Kodatron Speedlamp pg102
 1/30,000 sec, 2kV (similar to the aerial lamp) Pop Science Feb 1941
ground mounted aircraft beacon (6 or 12 radial beams)
Table: Strobotac, Strobolux, Microflash, Kodatron Port, Kodatron, Sea Search, B-25, A-20 & B-24. pg146
flash duration math for EG&G FT14 tube pg149
Apr 1943 - Jan 1944



14
4kV - 4000 uF aircraft flash
Jan 1944 - Feb 1944



15
Timing tests w/ parallel RC ckt in series w/lamp pg34
bomb damage photo pg40
Doodle Bug (Wiki) nearby pg51
K-19B wiring dia pg52, 53
Stonehenge pg57
A-26 flash install dia pg59 & plan pg60
Stonehenge photo from air pg61, 62
Flash tube tests pg64
?? pg64b
Stonehenge flight path? pg64c
K-19B night aerial camera pg71
ckt for 230VAC model 929 photocell pg78
Getting LORAN sets, testing APS-13 tail warning Rx pg79
K-29 camera pg82
weight of D-2 system 540 # pg87
FT-24 tube holdover testing pg99, 100 - 107
D-2intervalometerr calcs pg109
GR VTVM ckt pg113, (light meter w/ 629) - 119
using 1G4 battery tube pg120
photo plane located using APN-7 RADAR transponder & SCR-584 Radar (Wiki) sets pg121
1G4 tube light meter ckt pg122
Jan 4, '44 Construction of Exposure meter pg124 - 132
testing Cent Sci. stroboscope pg133
testing amp tubes for integrating exp meter pg134b
Series inductance fixes holdover problem in FT24 tube pg136
27 Jan '45 Hi-Freq camera for short films pg138
Shutter Tester pg139
Spark Gaps pg143
talk about IR detection of aircraft pg147
Photos: 9kV, 0.3uF, 240 RPM pg149 - 152
Feb 1945 - Mar 1946



16
A26c 2,400uF @ 4000V & rotating mirror movie camera pg1 (Wiki:A26)
rotating shutter camera pg2
example photos of microflash  lamp pg3, 4, 5
D-5 (A-26c) System diagram, 2ea K-19 cameras + FT-17 flash
Rotating mirror camera phototgraphs the GR strobe pg10
A26c strobe failed to fire because it was dark pg16
D-5 ckt dia photocell for triggering K-19 from flash bombs pg18
asks GR to manufacture photocell exp meter pg19
radar screen photos taken from A26c pg28 (is APS-1 a cover story for a K-band radar?) (Wiki: H2S)
Photo inside A26c pg28b
Radar screen photo & flash photo pg30
Gemeshansen coil for starting movie lamp pg31, 33, 34
Exposure meter meas shutter time pg32
1 Jun '45 - add 5% Thorium for pg 16 dark-start problem  pg 34
Testing 929 light meter pg36, 37, 38, 39
FT-20 lamp Light-v-Current plots pg41
Photo of   strobe tube pg43
strobe ckt pg45

Mar 1946 - Jun 1948



17
4V bat -Vibrator (15 sec delay) - 550 V Strobotron pg 143
Jun 1947 - Aug 1947
dd


Storage battery small portable strobe pg23
Jan 1948 - Jul 1948



18

Jun 1948 - Feb 1950



19

Dec 8, 1948 - Apr 8, 1951
ee


Rapamatic high speed camera
Eniwetok (Wiki)
Jun 1949 - Dec 1952
ff



Feb 1950 - Dec 1951



20

Aug 1952 - Oct 1952
gg


Underwater photo experiments
Flash 540V (12*9V) FT-110 lamp pg5
Camera pg22 & pg13
Dec 1951 - Jan 1954



21

Feb 1954 - Apr 1955



22

Apr 1955 - Dec 1956



23

Dec 1956 - Apr 1958



24
Work on Strobotac to come after the GR 631
underwater
Sonar test 15,000' deep pg47
Apr 1958 - May 1960



25

May 1960 - Feb 1962



26

Jan 1961 - Apr 1961
hh



Jan 1962 - Nov 1963



27

Nov 1963 - May 1965



28

May 1965 - Jul 1969



29

Oct 1969 - Jan 1973



30
EG&G SD-100 photo diode
5" sonar tests
Exposure calculations on Wash. dome
Golf swing
Bullet sonic boom shadow Spark Gap photos
Flap shutter in front of f2.5 aerial camera lens (fogging) pg114
Jan 1973 - Aug 1975



31

Aug 1975 - Jan 1978



32

Jan 1978 - Oct 1981



33
Map Long Island
EG&G 259 Sonar, Target in Loch Ness 1976
hair comb on balls photo?
Side Scan proposal at EG&G Feb 2, 1978 pg1
Juggling bowling pins photo pg2
16mm movies of cells (back light by FX6A pg3 - pg5
Photographing an eye, ants pg6
Test of Vincent 26L 18826x5 Shutter - Microflash pg9
MIcroflash golf photos
Underwater camera & Flash pg12
diagram raft, camera & 5 underwater strobes pg13
schematic Nature Photography Flash Unit
3 lamp houses, 70uS pg15
Water Drop system dia pg16
259 side scan testing pg17
Testing silh...underwater camera & rotary side scan pg20
Loch Ness Itinerary pg24
Sound Trigger for Focus pg31
Turbine blade break photo wanted, Reticon underwater use of imaging sytems, Dye Laser'78 pg32
Ocg '78 Lecture on photo of Atom Bombs pg34
Side scan search for 16" ball glass pg35
Output of spark ??? for silhouette underwater camera pg 36
petri dish type photo setup pg37 and photo pg40
Jan '79Writing preface for paperback Electronic Flash-Strobe, Minox FC35 pg42
Silhouette underwater camera volume calcs & FX6A ideas pg43
book "Moments of Vision" pg44
Elapsed Time camera design pg45
Color shadow photo setup pg49
  Condenserdesign for brine shrimp pg51
Test of 10" dia Fresnel Lens for Plankton (FX198 tube) pg52
'79 Plankton Camera drawing pg pg58
" wiring diagram pg59
1/4" plate glass on 4" pipe breaks at 100 psi (200') pg60
Stonehenge photo strobe illuminated pg61b
Newatode worms pg 61f
Test point light source pg62
GR Strobotac & Graflex flash output table pg67
Wiring for underwater camera and flash pg70
Apr '79 Plankton Camera diagram pg71 (maybe same as Graflex flash?)
17.5X Brine shrimp photos pg 73, 74
Vincent Model 26L18A26X5  s/n: 0669 shutter .001 seconds pg78
Shutter used to cut background light, not stop motion.
Golf swing Setup for Vincent test pg79
'79 3 Lamp Flash System wiring dia pg80
Silhoette Strobe wiring dia pg81
planning cavitation photos pg84
Color of Plankton setup pg86
Hydrophone Study pg88
Jan '80 6kc Hydrophone data (Massa was best) pg92
Jan 1978 - Dec 1983



34

Dec 1983 - Jun 1986



35

Jun 1986 - Jan 1990



36
Loch Ness, Sonar, sonogram, (big) water drops

Rapatronic camera (Wiki) polarizing filters + Faraday cell = microsecond exposure times.

People


O'Keefe was an early member of EG&G ( Edgerton, Germeshausen & Grier) and so was involved in the construction and testing of atomic weapons.  [not in book: It turns out the that strobe flash developed by Edgerton for W.W.II night photography uses the same capacitor banks and trigger circuitry as were part of the aerial flash and that company was taken over by the Manhatten Project to get the capacitors and maybe trigger device (Krytron) used on the Fat Man bomb.]  O'Keefe has a clear way to explain the different types of atomic weapons.  Written while the cold war was still going one, so has a bias.  Highly recommended.

Patents

3949349 Dual electroacoustic transducers, Frank Massa, Donald P. Massa, Filed: Apr 13, 1972, Pub: Apr 6, 1976 - has the cone shape (nb30, pg92)

4107659 Intrusion alarm system with improved air turbulence compensation - applicable to outdoor intrusion alarms.

Related

DigitalPhotography101 Digital Photography 101: The Basics
Digital Photography 201 Stacking Images
Digital Photography 202: Close-Up, Macro & Micro
Digital Photography 203: Color Management
Digital Photography 204: Studio Flash
Digital Photography 205: Astrophotography
Digital Photography 206 Micro Photography
Nikon cameras & Related
Photoflash Photoflash Units
Photography
Strobotac, Sonar & Krytron

Sonobuoys - use hydrophones
CRT-1B Sonobuoy

Links

PRC68, Alphanumeric Index of Web pages, Contact, Products for Sale
Page Created Oct 2016