"Betty Boop" (1947 - 1949)
I have never heard of a “Betty Boop”
survey instrument, but that is the name identified on the calibration
curve and the schematic (on the inside of the case). It is almost
certainly a variation of the “Betty Snoop", a high end survey
instrument employing a plastic ion chamber that was developed in WW II..
Although the probe of this particular “Betty Boop” is missing, the
circuit diagram, connector, zero adjust, and calibration ranges indicate
that it was an ion chamber.
The front end of the case has two controls, an on/off switch and a zero adjust, while there are two recessed adjustments on the side, one marked “Feed back” and the other marked “Sen. Adj.”
A metal plate attached to the case reads: “An Instrument Division
Product, Argonne National Laboratory, Mark 2, Model 10, Ser. No. 27,
U.S.A. No. 41129. A hand drawn calibration curve for each of the four
scales is attached to the side of the case and the calibration
date is identified as
Detector: missing, assumed to be ion chamber
Meter scale: 0 – 20 microamperes
Range: 0 – 0.2, 0 – 2.0, 0 – 29, 0 – 200 R/h
Size: 3.5” x 9” x 5.5”
Batteries: one 1.5 volt, three 7.5 volt, one 22.5 volt, one 67.5 volt
Donated by Ryersson Polytechnic Institute courtesy of Herbert Clark.
Copyright 1999, Oak Ridge Associated Universities