Boron for Curtain

c.c. file

The boron curtain has an area^{a} of 55 ft², and is 1/2" thick.

thus the volume is 2.3 ft³. Assuming that the maximum packed

density is 1.73 gm/cm³, the weigh needed is 250 lb.

Since we plan to mix it with paraffin, the density will not be that

high, so somewhat less will be used. I propose we order:

- 200 lb 60F Metallurgical grade Boron carbide

@ $500/lb = $1000. Norton Company Worcester 6, Mass.

can easily come out of this.)

Notes:

^{a}One panel 5' x 5'; 4 panels 5' x 1 1/2'. See sketches attached,

which have been