Rit amtmrertpteadntasl
to a short piece of rubber covered wire. A packing gland was provided
in the gage case to insure a pressure tight seal for the initiation
cable.
The potentiometer was set so that bright sunlight would not trigger
‘Me|,ta Menienneees“;
f _prveersscinetid
the circuit.
slety
eetante Peeft
ant
In most instances, a piece of exposed film was wrapped
around the phototube and a cardboard collimator wrapped the tuhe to
further insure that premature triggering would not take place.
After
the gage was started, the fact that the phototube might be blown away
was of no consequence as the hold contact of the advance relay kept
fu ; motor circuit intact.
The gage ran until the advancing drum de-
cv
Jeers gg
aa ot
pronto
pneu,
phototube was mounted on the outside of the gage on connectors attached
|
piessed the limit switch.
i
This limit switch was usually adjusted to
dow the drum nine revolutions or 1 1/2 minutes running time.
a}
B.4 HRESSURE-TIME GAGE, CLOCK TYPE
i,
The clock type pressure-time gage or "C" gage (see Figure C.7) is
essentially the same as the pressure-time gage as used in UPSHOT-
KNOTHOLEby Broject 3.30 (see Reference 1).
It records pressure-time
by the action, of a pressure sensing capsule on a rotating aluminized
glass disk.
e disk is rotated at 5 rpm by a 6 volt vibrating-reed
motor.
sniftetion is accomplished by a 2k hour clock which depresses
@ micro- seittne The~initiation system was modified to permit setting
of start time up tdabproxinately 96 hours prior to shot time by using
two switches connettegd in series.
One consists of a set of contacts
geared to the arm
t of the clock so the contacts close every 96
hours.
The other I8"a
pmteroswitch closed by the pointer arm of the
clock every 24 hours.
former provides a coarse time adjustment;
the latter permits a fi
ime adjustment (7 2 min) and also limits
the running time of th
e to approximately 20 minutes.
Both the
depressor arm and geared-tontgets are adjustable so the starting time
ean be readily set for any va
from 0 to 95 1/2 hours in advance,
B.5
PEAK PRESSURE GAGE
The peak pressure gage was ext} nely simple in construction con-
sisting essentially of six major co donents:
(1)
(2)
Standard Pressure Cap
Gage Plate. A1/2 i
thy
steel plate, 8 1/2 inches
in diameter. A pressure inlet hole 0.252[hohe
in diameter was
drilled through the plate slightly off center
e pressure capsule
was mounted on the plate with capsule inlet
hole in line with the hole
through the plate.
py
(3) Glass Record Blank. The blank weg™a rectangular picce
of glass coated with an aluminized surface (see Figure C.2). The
blank dimensions were 1/2 inch wide and 1 inch Long, in operation the
blank was cemented to the slide.
(4)
Slide and Slide Holder.
This unit pro
mounting
for the glass blank and was mounted beside the capsul i the gnge
plate,
The holder was so mounted that Lhe capsule afus/point rested
on the glass blank,
A screw adjustment was provided
ermit the
moving of the slide with blank assembled, in a lateral direction past
60
a