Edgerton Lab Notebook 07, Page 03:
May 04, 1936
- Page start date:
- May 04, 1936
- Content type:
- diagram,notes
- Transcription:
- [p. 3]
May 1 1936
H. E. Edgerton
The tube shown on the opposite page does not run consistently with the cable [?] spark from the strobotron oscillator (1/4" spark). The tube was opened and put on the pump again, sealed off this time at 4 cm of argon. The pressure is still slightly high although operation is satisfactory most of the time. This tube was run all day today (6 hours) and there is very [word crossed out] little sputtering of the cathode.
[labeled diagram] 1:1 sketch of cathode
[labeled diagram] cscl + Al filing pressed in; soca iron; nickel; nickel screen
Another tubeidentical was made this afternoon by Mac Bick [spl?] and I pumped it during supper. I sealed it off with 2 cm of Argon when cold. Works OK in circuit. Started running at 6:45 PM 2 uf 1200± 20 cycles.
May 4 '36 - The tube with 2 cm was put into operation for "Open House" on May 2 [crossed out words] in the morning and it ran until about 6:30 PM at 20 cycles per second. It was used to observe water drops coming from a nozzle, the flow of water set up by a small pump. 2 micro[--?--] at about 1200 volts were used across the tube. Some sputtering this time but it was on the anode due to arc backs [?] cathode spots were in evidence on the anode.
The tube broke when some water was thrown on it by one of the spectators. The a neon tube was put in its place until 10 PM the end of the show.
- Keywords:
- drops & splashes; MIT Open House; neon tube; piddler; water
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