149 
10 Feer AfarT 
Two Contacts 
FLOATING Box. 
Fig. 44. Circuit arrangements of Shot 105; they are generally similar to those shown in Fig. 49. 
Ruaser Briss RvusBer RupBer Roeper Brass Rusper 
Fig. 45. Contact used in velocity measurements ; strips of brass and rubber were assembled in the order 
shown, the rubber strips being cemented together by painting them with naphtha ; B, is a section 
of the assembled contact on the line A, A, the thickness being much exaggerated ; actually the 
contact was about } inch wide and 5/32 inch thick. 
