TEST OF FIRING DEVICES MARK 12 MODEL O AND MARK 15 MODEL O

• Document Type: CREST
• Collection: General CIA Records
• Document Number (FOIA) /ESDN (CREST): CIA-RDP78-03642A002500040020-8
• Release Decision: RIPPUB
• Original Classification: C
• Document Page Count: 6
• Document Creation Date: December 22, 2016
• Document Release Date: August 22, 2011
• Sequence Number: 20
• Publication Date: November 16, 1983
• Content Type: MEMO

Sanitized Copy Approved for Release 2011/08/22 :CIA-RDP78-03642A002500040020-8
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 Sanitized Copy Approved for Release 2011/08/22 :CIA-RDP78-03642A002500040020-8
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 Sanitized Copy Approved for Release 2011/08/22 : CIA-RDP78-03642A002500040020-8 - ~ ~~.~
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of 7 Copies
Subject : Test of F'ir3.ng Devices Mark 12 Model 0 and nark 15 Model 0
Reference; STSGI #7134 DIR #46866
Training Division
s-5034 copy
OPERATIONAL RESEARCH REPORT #21
Pursuant to receipt of cables concerning the unreliability of
Firing Devices Mark 12 and Mark 1K Model 0 it was decided to test
samples from our small stock on hand. These devices, commonly called
Navy Clocks, were designed for underwater use and have been used
sparingly in our training program because of their relatively high
cost and our meager supply.
L, t Num~ 'bars:
Of the Mark 12 firing devices we had a total supply of thirty-one
(31) each, some twenty-five (25) of these being received within the
last six months in our most recent shipment; the remaining six (6) were
left from our initial supply. Test samples taken from the initial
supply were marked Lot #2, while the samples taken from the recent
shipment were marked Lot ~. and Lot #5 respectively.
Of the Mark 15 firing devices we had a total supply of n3.nety-six
(96) each, some seventy-five (75) of these being received with the same
recent shipment of Mark 12 devices. The remaining twenty-one (21) were
left from our initial supply. Test samples taken from the initial sup-
ply were all marked Lot #2, while the samples taken from the recent
shipment were found to be without the usual lot number and naval
inspac?tion stamp.
Page 1 0 =Pages
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...~-
S-50311 - Copy of 'j Copies
r r
.~.~
vi c
e
Fib De__
Mark l2 M d
el 0
,
?
u
,
Test No.
Lot No.
De
1 ~ Set
Time Fl.re
d
Error
1
2
_
~5 seconds
,~
l~..lf. seconds
- .6 seconds
2
2
'j0 seconds
69.0 seconds
-1.0 seconds
3
5
30 seconds
30.1} seconds
~ .1} seconds
~-
~
90 seconds
89.2 seconds
- .8 seconds
Packa in
Both the Mark 12 and Mark 15 devices are individually packaged in
sealed metal containers. This method of packaging has thus far proven
to give the best protection during long term storage in this corrosive
climate. All samples tested appeared to be in excellent condition
upon removal from their containers.
Method of Testing;
All devices tested were attached by a short length of time fuze
to a blasting cap, thus providing safety should a device fire immediately
upon arming. The tests were conducted outdoors, the weather being an
almost continuous rainfall.
The Mark 12 firing devices, which have a maximum delay of 92
seconds, were timed with a stop watch. The Mark 15 devices, having a
maxirnum delay of eleven hours, were timed with a reliable wrist watch.
Tables of Results;
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~a
S-503.
Copy~~
of 7 Copies
F3
~~ Dew Tice Mar lZ M.,odel 0
.
Tew t No.
Lot No.
la~ Se
t
De
i red
Time F
Err, rb?:
_
,
_
r
1
2
6 hours
6 hrs. 5 rains.
~ 5 minutes
2
2
8 hours
8 hrs. 7 wins.
~ 7 minutes
3
2
11 hours
Failed to Fire
- - - - - -
!~
2
22 hours
2 hrs. 1!~ rains.
-16 minutes
5
None
12 hours
1 hr. 22 minx.
- 8 minutes
6
None
!~ hours
3 hrs. 43 mans.
-17 minutes
7
None
1 hour
1~9 minutes
-ll minutes
8
None
6 hours
5 hrs. 53 mina.
- 7 minutes
1. In consideration of the fact that these clockwork devices
are fully wound from the time of manufacture until they are
armed, the relatively small amount of error appears negligible.
2. Failure of the one Mark 15 device set for the maximum delay
of 11 hours cannot be considered indicative because of the
small number of samples tested.
3. While the possibility of premature firing of time delay
devices can never be overlooked, there was no such occurrence
in any of the devices tested.
Recommendations:
1. It is recommended that Firing Devices T?iark 12 Model 0 and
Mark 15 Model 0 be considered satisfactory for use in training
with the stipulation that a sufficient length of time fuze
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s-5o3~+
2.
}~('~~+e;,-~:~?A~-t~-~'r ~ ~ Copy of 7 Copies
be connected between the device and the blasting cap for
safety purposes in the same manner ~ is already suggested
for use with the Firing Device, Delay Type, M-1 (time
pencil).
It is further recommended that Mark 12 and Mark 15 firing
devices be considered satisfactory for operational use
with blasting cap attached in the normal manner. The risk
of premature firing of the device should be accepted by the
agent as a claculated one. The odds are in his favor. The
risk is inherent in both the time pencil and clock devices,
xhile the clock devices appear to be more accurate and
reliable than the time pencils.
Distribution:
Copy #1, #2 - Headquarters ATT:
Copy #3 - Headquarters ATT: FFr~
copy #4 -
Copy #5 -
Copy #6 -
CoPy #7 -
e
Tr_aini~SFi
Page 4 of
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25X1
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