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Appendix DO
POSTSHOT PRESSURE-TIME GAGE INSPECTION
Many of the gages were inspected after the shot to obtain information applicable in explaining defects in their recordings.
Thus, by
comparison of gage faults and record defects, a correlation could be
nie
Unfortunately, the number of variable factors affecting the
ages--pressure ranges, combination of faults, orientation, etc.--was
co large to promise a highly reliable correlation, and thus measuregents made during the inspection of the gages were concerned more with
" expressing the faults in relative terms than directly, and were not
made ito a high degree of accuracy.
| [External damage to each gage was recorded in terms of the angles
through which protruding parts were bent, depth and extent of chipping
ani send blasting by flying particles, and burning of exposed flammable
materials pp\the gage.
An i ere ‘inspection was made, first, of the turntable drive
mechanism
a]feteraine the extent of free movement of the turntable
shaft alo
s ais the amount of wobble of the turntable (the
distance its ed de uld be moved in a direction parallel to its axis
of rotation) -t*itny axis perpendicular to the shaft axis, and the
slip in the
:..3%1' >. tetween the motor and turntable (measured as
the angle C.rcanh wh ahhe turntable could be turned with a minimum
of resistance),
(a
(
The capsule was *.% \' * for any residual distortion or leaks
and the stylus armw'.‘'.,°:' ' for parallelism with that radius of
the turntable which ";ough the center of the capsule, and the
stylus was checked to see tHat it was perpendicular to the recording
disc.
Any discrepancies were] recorded.
The capsule was then rdmbved and the amount of damping ard its
condition and the quantity of forei
matter in the orifice was
recorded.
Also, as a triple chee
gage assembly lists, capsule
riumbers were recorded against gag
DES
The traces of the recording fe were then rechecked for
specific defects which could be gtouped
generally as, (1) the case of
no record where either there was no trads|whatsoover or where the
trace disappeared before it reached Lesfen, ‘2) the case of an
inaccurate record in which a record was | oe but did not avrer with
other gages in the same cluster, and (3}
e gase, of a distortnd
record where the trace was instable both as
2] time and amplitude,
By comparison of the notes on gage inspec ten and those on the
recording discs it was generally easy to findit
reason for gage
malfunction.
Where yields were far above thosépredicted, failure to
achieve a record was caused by such large pressures
the cipsules
were permanently distorted and often in such a way so Lift the
stylus away from the disc. Also, the dises often,
ddr) these excess
pressures, and occasionally, under lower pressures,
Sked and rell
78