The Lifetime and Decay Modes of Negative K Mesons Page: 51 of 55
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Ionization-Data Microscope and Tabulator
Since ionization determinations constitute a large part of the
measurements taken in emulsion work, it is desirable to improve the
speed, objectivity, and ease of making them. The apparatus described
here was built for this purpose, and has proved to be of great value
in this work . It consists of a specially modified microscope and an
electronic data tabulator, and borrows heavily from a device described
by Baroni and Castagnoli. Z5
A constant-speed reversible electric motor drives the x movement
of the microscope stage through gears at 40 and 200/min. To aid in
alignment of tracks with the x movement, a rotator with vacuum hold-
down for the plate is mounted on the condenser frame, permitting a 60-
deg rotation of the plate about the optic axis. Vacuum hold-downs on the
stage also are provided so that the plate may be fixed to it without risk
of disturbing the aligment.
The tabulator is a transistorized modification of the circuit used
by Baroni and Castagnoli. 25 On one traversal of the track, it
tabulates upon the operation of one push button, the total number of
gaps, the number of gaps greater than a preset length, and the
integrated gap length. The tabulator is turned on by a foot switch
simultaneously with an electric clock, which indicates the total time,
or length of track scanned. The push button is depressed as the beginning
of a gap crosses a line on the reticle and released at the end of a ;lap.
This avitch operates a second clock which integrates gap length, a
counter which totals gaps and through a variable RC circuit, the
long-gap counter. The instrument is shown in Fig. 16.
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Nickols, N. A. The Lifetime and Decay Modes of Negative K Mesons, thesis or dissertation, September 1, 1959; United States. (https://digital.library.unt.edu/ark:/67531/metadc1015953/m1/51/: accessed April 25, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.