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Project 12.2 - Phonex - D. Phillips
The same type of concrete and paraffin shield was already con-
structed for BLACKFOOT as had been designed ror fice
The
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necessary modifications were also similar except that there was 4
little more time available.
One of the three phonex stations for
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WMEGpscirocr) was eliminated (600 yds.), leaving the 300 yd. and
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450 yd. stations,
The line of sight to the 300 yd. station was
through a 3" I, D, transite pipe with #" wall,
from the concrete and paraffin shield.
This pipe was removed
The only thick wall heavy
material tubing available was a piece of stainless steel 2" I. D. with
3/4" wall,
™
This was wrapped with 1/8" lead sheet, leaving approx-
imately 1/8" clearance between the lead and concrete or paraffin.
This
space was filled, after careful alignment, with a thin concrete grout.
The plywood liner of the rectangular aperture was also removed and the
same type of 3/4" wall stainless steel tube wrapped with 1/8" lead was
carefully fixed in position.
A thinner walled tube was placed along
the J-13 line of sight through the shield.
The space around these pipes
was then filled with concrete grout.
No particular precautions were taken with the 450 yd. station except that it was extensively sand bagged.
Every effort was made to
reduce the blackening of the C2 emulsions at the 300 yd. station.
Four
inches of lead shielding was constructed on top, front and both sides
of the collimator block,
This was built from 1100 lead bricks with
lead wool chinking.
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The front blast plate had three 14" I. D. tubes 6" long welded
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