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the recording disk by use of the optical system of the microscope for
amplification. Readings of the deflections on the records are
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onnel
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usually made to the nearest 1/2 mil or 0.0005 inch, although it is
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possible to read to 0.0001 inch if necessary. Under ideal conditions,
the width of the trace should be 0.2 to 0.3 of a mil. Due to the
variation in the thickness of the aluminized coating and the pressure
Mabe al Te ae me a tne ne te cet
Figure 3.8
Initial portion of st
c overpressure versus time and
total overpressure ver
timefrom the BRL dynanic
pressure gage. Each calibratioh step represents 1 psi.
Shot 3, Station 124.15,
| Ly
of the stylus on the recording disk, idealdoHaitions were not always
obtained,
When the recording is centered on the mi ro
it is possible to read time along the record in
ope turntable,
of degrees of
rotation, ‘The rate of turn of the recordingdi
B/3 rpm. This is
broken down to 1 revolution per 20 sec or 18° rotation per sec. The
39
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