Edgerton Lab Notebook 10, Page 30:
August 14, 1939
- Page start date:
- August 14, 1939
- Content type:
- notes
- Transcription:
- H E Edgerton
Aug 14,1939. Monday
On my trip to Washington Navy yard, a few photographs were taken of specimens breaking in a tensile test. Two methods of synchronizing were used - one a microphone a few inches from the break - the other a contactor which would go together when the specimen parted. I suggested the use of a phonograph pickup on the metal as a very rapid signalizing device.
On Friday Aug 4 I went with Kay and Carl to the Navy Research Lab at Anacostia. Drs Irwin and Kinzer were there and helped to take photographs of 30 cal bullets striking an iron plate.
Commander Roop rode with me to Wilmington Del. Aug 4 after work was finished. Stayed at DuPont Hotel.
Aug 5 morning was spent in American Viscose Co at Marcus Hook. Discussed results of last weeks tests with Haley. Also went over microscope as it comes from the nozzle into the acid bath.
On Sat (Aug 12) I worked with Germushousen on the set up for photographing through microscope. A condense system was tried but could not get image of the 3 mil capillary in the glass jet. Our 9" reflector with a straight tube at the focus was put directly behind the specimen and focused on it. 1 mf at 1000 volts produced amplex exposure with a 40 mm objective with about a 4x enlargement a 25 mm obj was also used giving about an 8x enlargment (?) both above on positive sound recording film
- Keywords:
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