PROGRESS REPORT OF MK 3 TIMES DELAY

• Document Type: CREST
• Collection: General CIA Records
• Document Number (FOIA) /ESDN (CREST): CIA-RDP78-03642A000700050001-8
• Release Decision: RIPPUB
• Original Classification: C
• Document Page Count: 4
• Document Creation Date: December 22, 2016
• Document Release Date: May 24, 2011
• Sequence Number: 1
• Publication Date: March 18, 1957
• Content Type: REPORT

ILLEGIB
Sanitized Copy Approved for Release 2011/05/24: CIA-RDP78-03642A000700050001-8
CONFIDENTIAL
L ,7c /may
18 March 1957
Dear Joe,
Enclosed is Progress Re ort on the Mark
Time ,~.which,`coTC~ngr.~o our instructions,
sums up the work interrupted due to Don's accident.
We have continued our effort and hope to bring
this work to a satisfactory solution within the
allotted time.
Regards,
CON r- I
DENILAI
Sanitized Copy Approved for Release 2011/05/24: CIA-RDP78-03642A000700050001-8
 Sanitized Copy Approved for Release 2011/05/24: CIA-RDP78-03642A000700050001-8
CONFIDENTIAL
PROGRESS REPORT
OF
MK 3 TIME DELAY
March 1957
CON IDFNTIAL
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 Sanitized Copy Approved for Release 2011/05/24: CIA-RDP78-03642A000700050001-8
CONFIDENTIAL
PROGRESS REPORT OF M1 3 TIME DELAY
FOR
PERIOD ENDING FEBRUARY 1957
Because of an injury to the project engineer for this task,
reports were not written as would normally be expected. There-
fore, this progress report summarizes work from 1 July 1956 to
I March 1957.
In the last report, it was stated that the Western No. 3
Primer could be initiated satisfactorily in this unit. This
primer is expected to withstand the normal surveillance require-
ments provided that it is "potted" into the primer holder.
Although no difficulty should be expected in the initiation of
the Corps of Engineers special non-electric blasting cap by
this device, using the Western No. 3 Primer, it was considered
necessary to ascertain by experiment whether or not satisfactory
firing of this blasting cap actually takes place. `fen tests
were conducted using the Mk3 Delay incorporating the iVestern
No. 3 primer to initiate the Corps of Engineers blasting cap.
The blasting cap was fired in all ten tests.
Using a 25 pound spring, a failure of one striker pin
occurrod causing premature activation of the unit, even though
a stress analysis of the unit showed that the pin had a satis-
factory safety factor. However, it was decided that two changes
would be made to prevent such failures. The first was changing
the spring to one having a compression of 13 pounds, but having
CO FI DENTIAL
Sanitized Copy Approved for Release 2011/05/24: CIA-RDP78-03642A000700050001-8
 Sanitized Copy Approved for Release 2011/05/24: CIA-RDP78-03642A000700050001-8
CONFIDENTIAL
a greater travel. This greater travel allows an even greater
net compression than obtained using the 25 lb. spring after the
head. of the striker pin has pulled through the timing disk.
The second design change is changing the actual firing knob
from the end of the striker body and placing it on the end
of the striker pin. The pin is, therefore, lengthened and
screwed through the striker body. With this new system, if
the threads of the striker pin were stripped, the firing knob
would not contact the primer and the unit obviously could not
fire.
Using the new spring, 90 tests were conducted to determine
whether or not the unit would reliably initiate the No. 3 Western
Primer. No failures occurred in any of these tests. These first
90 tests were conducted with the unit screwed into a block of
wood. To farther test the unit, an additional 10 tests were
performed in a similar manner except that the unit was sus-
pended from the ceiling by means of a rubber band instead of
screwing it into a block of wood. No failures occurred in
these tests.
Future Work Planned
1. Timing tests at 410, ?7? and 104?F will be conducted
upon the unit.
2. The task will be terminated.
FINANCIAL STATUS
Total Amount of Contract $11,652.00
Expenditure through 31 January 1957 8,330.19
Unexpended Balance 3,321.81
Expiration Date 2 May 1957
CON IDENTAL
11 Sanitized Copy Approved for Release 2011/05/24: CIA-RDP78-03642A000700050001-8