THIS IS THE FIRST LETTER REPORT UNDER TASK ORDER NO. LL, AND IT SUMMARIZES THE WORK DONE FROM OCTOBER 14 TO NOVEMBER 14, 1959.

• Document Type: CREST
• Collection: General CIA Records
• Document Number (FOIA) /ESDN (CREST): CIA-RDP78-03642A000700100017-5
• Release Decision: RIPPUB
• Original Classification: S
• Document Page Count: 3
• Document Creation Date: December 22, 2016
• Document Release Date: August 10, 2011
• Sequence Number: 17
• Publication Date: November 19, 1959
• Content Type: LETTER

Sanitized Copy Approved for Release 2011/08/10: CIA-RDP78-03642A000700100017-5
%JUIIFIULIU I IUL
r 19, 1959
This is the first letter report under Task Order No. LL, and it
summarizes the work done from October 14 to November 14, 1959.
On March 27, 1959, an effort under Work Order No. IX, Task Order
No. CC, was undertaken to conduct research directed toward the development
of an experimental time-delay unit utilizing silicone fluid. This unit was
to operate in deep water; be inexpensive, reliable, and relatively small;
and actuate a firing pin after one year had elapsed. This effort resulted
in an experimental unit which has shown satisfactory operating character-
istics over a period of 3 months at an ambient temperature of approximately
75 F. Because a major problem in the development of any time-delay device
is reproducibility, Task Order No. LL was set up with the objective of
making minor modifications to the unit developed under Work Order No. IX,
Task Order No. CC; preparing four units; and evaluating them for approxi-
mately 2 months at 75 F and 4+0 F.
During the current report period, the time-delay-unit design was
modified, the time-delay-unit evaluation equipment was completed, and the
flow-evaluation program was started on eight metering tubes.
The time-delay-unit design was modified to incorporate an 0-ring
seal in the flange, a filler plug in the cap, a threaded end cap for at-
tachment of the neutral buoyancy unit, and a threaded body for attachment
CONE!DENTIA.
Sanitized Copy Approved for Release 2011/08/10: CIA-RDP78-03642A000700100017-5
 Sanitized Copy Approved for Release 2011/08/10: CIA-RDP78-03642A000700100017-5
CONFtENTIAL
November 19, 1959
to the device to be operated. In consideration of the time-delay device as
a production item, the major components were designed to be cast from
Type 356 aluminum alloy and then heat treated to the T6 condition; Type 356
cast aluminum alloy was selected because of its good resistance to salt-
water corrosion.
A test stand was fabricated to hold four time-delay units. Four
dial indicators were mounted on the stand to measure the travel of each
bellofram plunger over a 2-month period of evaluation. A refrigerator was
modified to maintain a temperature of about 75 or 40 F, which temperatures
are representative of the two operating temperature ranges of interest. A
manifold was designed and built to hold eight metering tubes, which are
described below.
Eight metering tubes, each 0.075-inch OD x 0.010-inch ID x 2 inches
long, were cut from a common piece of Type 321 stainless steel seamless
capillary tubing. These tubes have been installed on the above-mentioned
manifold, and the flow of silicone fluid under 70-psi pressure is being
measured. Subsequently, these flow data for the eight tubes will be
compared; on the basis of these measurements, four metering tubes will be
selected and installed in the modified time-delay units, which are to be
prepared with springs individually designed to provide the proper time delay
with each metering tube.
During the next month, it is expected that the four modified time-
delay units will be fabricated and assembled, and filled with silicone
fluid. Then, the time-delay-unit evaluation program will be initiated.
CONFIDENTIAL
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Sanitized Copy Approved for Release 2011/08/10: CIA-RDP78-03642A000700100017-5
November 19, 1959
The original appropriation on this Task Order was $7,950. As
of November 1, 1959, the unexpended balance was approximately $6,400.
q _ a
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CONFIDENTIAL
Sincerely,
In Duplicate
CONFIDENTIAL
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