One of our New England treasures (now gone) Jack Naylor had a long personal friendship with Doc and Jack had a wonderful collection of the original prints Doc most loved. Doc was very much the photographer at heart... I spent many an hour talking with Jack and enjoying those prints and the stories behind them, along with all the other beautiful original art in the Naylor Collection. I sure do miss him... Eric Goldstein -- On Mon, Dec 7, 2009 at 9:37 PM, Jim Brick <jim@xxxxxxxxx> wrote: > Anyone interested in everything there is to know about 'Doc' Edgerton, > including the contents of all of his research notebooks, go here: > > http://edgerton-digital-collections.org/ > > I never met 'Doc' but in 1989 I took a book publishing workshop with his > younger brother (sorry - can't remember his first name). > > Every photograph of an American atomic bomb detonation was taken by Doc > Edgerton. > > http://www.anomalies-unlimited.com/Bomb.html > > Jim > > > On Dec 7, 2009, at 5:50 PM, Richard Knoppow wrote: > >> >> ----- Original Message ----- From: <aghalide@xxxxxxx> >> To: <rollei_list@xxxxxxxxxxxxx> >> Sent: Monday, December 07, 2009 4:49 PM >> Subject: [rollei_list] Re: Rolleiflash Disaster >> >> >> Harold Edgerton used flash to produce a stroboscopic effect. He was famous >> for his high-speed stop action photos. The high-speed photography was >> instantaneous. Flash bulbs are not instantaneous. They require what was >> called m or f synchronization. Camera shutters used to offer either x for >> instantaneous for electronic flash, or m or f delay which represented the >> time between when the shutter was fired and when the flash went off. You >> have the possibility of 3 delays for the flash when you click the shutter on >> older cameras. Only x has been retained, and they don't even call it x. >> >> Ed Farber brought the electronic flash to the populace. He used a 510V >> battery to obtain enough voltage to produce the flash. The studio units >> utilizing low voltage battery packs were often very large and heavy and not >> practical. Eventually with the advent of the transistor to produce enought >> voltage the units were smaller and more practical. In some cases too small. >> He invented a high speed electronic flash in a company called Strobo >> Research in Rochester, NY. Which was bought by Graflex and permitted him to >> retire at an early age. rather than use a very large electronic flash to >> produce high speed result, Ed Farber (I edited his column about flash) used >> what I think was a rectifier to take the low voltage from the batteries and >> make it a high voltage. These rectifiers were very large. With the advent of >> the transister in 1959, Multiblitz in Germany did away with the rectifier >> and used transisters to increase the voltage from the battery pack to >> produce a practical hand-held electronic flash unit. >> >> Ed Meyers >> >> Harold Edgerton was one of the inventors of strobe flash. Early strobe >> units were for motion study and used low intensity Neon lamps. The famous >> General Radio Strobotac is an example. AFAIK the first studio strobes were >> made by Kodak under the name Kodatron. These came out sometime around the >> late 1930s. They were very large and heavy lamps which ran on AC. The early >> ones were designed to produce the fastest flash time. They were very noisy >> due to the mechanical stress on the capacitors and other parts by the sudden >> change in energy state. I remember them sounding like pistol shots. Later >> Kodatrons had a resistor in series with the lamp to increase the flash time. >> They still stopped most motion but were quieter and had less problem with >> reciprocity failure effects, a major problem when the exposure times were on >> the order of 1/10,000 sec or less. >> I remember the name Strobo Research but not the trade-name they used. >> The use of high voltage batteries was made necessary by the lack of the kind >> of circuitry needed to generated it from a low voltage source without being >> large and heavy. >> Some early strobe flashes had built in delays to account for the M delay >> in many cameras. One could switch from X (instantaneous) to M as required. >> I believe most of the flash lamps were made by General Electric. >> Edgerton, Germeshousen, and Grier was the name of the company who >> controlled the strobe patents. >> >> -- >> Richard Knoppow >> Los Angeles, CA, USA >> dickburk@xxxxxxxxxxxxx >> --- >> Rollei List >> >> - Post to rollei_list@xxxxxxxxxxxxx >> >> - Subscribe at rollei_list-request@xxxxxxxxxxxxx with 'subscribe' in the >> subject field OR by logging into www.freelists.org >> >> - Unsubscribe at rollei_list-request@xxxxxxxxxxxxx with 'unsubscribe' in >> the subject field OR by logging into www.freelists.org >> >> - Online, searchable archives are available at >> //www.freelists.org/archives/rollei_list >> > > --- > Rollei List > > - Post to rollei_list@xxxxxxxxxxxxx > > - Subscribe at rollei_list-request@xxxxxxxxxxxxx with 'subscribe'in the > subject field OR by logging into www.freelists.org > > - Unsubscribe at rollei_list-request@xxxxxxxxxxxxx with'unsubscribe' in the > subject field OR by logging into www.freelists.org > > - Online, searchable archives are available at > //www.freelists.org/archives/rollei_list > > --- Rollei List - Post to rollei_list@xxxxxxxxxxxxx - Subscribe at rollei_list-request@xxxxxxxxxxxxx with 'subscribe' in the subject field OR by logging into www.freelists.org - Unsubscribe at rollei_list-request@xxxxxxxxxxxxx with 'unsubscribe' in the subject field OR by logging into www.freelists.org - Online, searchable archives are available at //www.freelists.org/archives/rollei_list