Edgerton Lab Notebook T-1, Page 32:
April 21, 1930
- Page start date:
- April 21, 1930
- Content type:
- notes
- Transcription:
- Stroboscope-
Previous work to date (Apr. 21, 1940) which I have on loose sheets were today glude into this book on the following pages 33 to 38.
The circuit on page 35 was used successfully as an open house display in the spring of 1929. Mr. Robert V. Kleinschmidt and Mr. Ben B. Folger of Arthur D. Little Inc. came over and I demonstrated the setup to them the week after open house. They were interested in a slow speed stroboscope. I gave them a price which was high because of the difficulties I expected in the construction and test of the device.
The main disadvantage of the circuits on pages 34, 35, 37 is the fact that a contact on a rotating device must carry the entire current which gives the light. The first contact that touches gets a heavy surge of current which raised havoc with the metal by burning. Part of this trouble can be eliminated by inserting a small amount of inductance which cuts off the rapid rise of current. It also tends to make the current oscillatory.
The circuits of pages 33 and 36 are better since the transient is tripped by the switching circuit. Page 33 circuit does not have a holding arc. The high potential from the spark coil may set off the transient by being connected to a tin foil around the cathode outside the glass. A surge of current discharges the condenser and the resistance to the line keeps it from maintaining the [?].
- Keywords:
- Arthur d. Little; stroboscope
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