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OCR Page 1 of 5Missellaneous Experiments Conducted in Dr. Flinn's Laboratory,
College of Physicians and Surgeons, 168th Street, New York,
New York, April 25, 1928
by
Dr. F. B. Flinn and Herman Schlundt.
Sensitivaness of the Tulp quartz-fiber electroscone when used as a gamma ray in-
struments The natural drift of the instrument was taken first: Results--
70-65 sub divisions of scale 9' - 54° ° (Schlundt) or 0.00842 d.p.sec.
69-54 "
"
11
"
10'- 6* (Flinn) or 0.00825 d.p.sec.
Average
0.00838 d.p.sec.
Dr. Flinn then seated himself in a chair so that the instrument was
close to the middle of his back. He held in his hand in a vertical position a
standard of 10 micrograms (solution) of radium contained in a sealed glass nearly
3 feet longe The liquid in the tube measures 31 inches, and the tube is 20 mm
external diameter. Readings of the drift were again taken, this time by Schlundt
alone.
66 - 56 divisions in 18' - 13° or 0.00915 d.pesed
Subtracting natural drift
0.00838 11 11 11 we get a net
increase of
0.00077 it
Schlundt then exchanged places with Flinn but he did not hold the radium
standard.
64 *** 59 Divisions in 9' - 3219 = 0.00874 d.p.sec.
The natural drift with no one in chair was then taken.
Flinn
58 - 53 in 9° - 27°9 or 0.00883
Schlundt
57 - 51 in 11* 44°1 or 0.00852 " **
et
Average 0.00867 " If
11
This value subtracted from the drift with Schlundt in chair shows a not increase
of only 0.00007 d.pesec.e a value safely within the limit of experimental error.
The result shows that Schlundt is not radioactive.
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