This is the middle layer of lead bricks that forms the top of the castle and measures 28" square.  In order to allow passage of the cable from the photomultiplier tube to the PC, a one inch hole is drilled at a 45 degree angle downward to the right as indicated in both the side and end views shown above, so that the bottom of the hole through the brick is directly above the hole in the layer of lead bricks below this one.

For more information about this report contact: Stephen L. Snyder or Joseph S. Duval
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