902 
ll. 
: -t/6 
the ratio, r, of the total pressure to ath,C , the value correct 
for a verfectly immovable, rigid, and infinitely wide block. 
Ge iti ge 
(HOF2) ori eisrt er ea 
where Ti Cel ae. O, = fed / PC. 
n is a measure of the thickness of the block. 
When t = 0, r = 1; and as t increases, r decreases. The formula 
doer not interest ue for values of the time longer than t = oe 
the deformation time of the gauge. If the block has so much inertia 
that r(@,) = 0.99, then its thickness must satisfy the equation. 
(10,3) m=p in (.02n + ,98) 
n-1 
mn = 0,/e 
Two C I Th B 
The rigid block criterion is 
(Ji53) > m =n. In (loen * .98) 
The soft block eae is by (22.2) 
(132) m= gn 
where 
g= Pcl fe Ce 
Surpose that the gauge constant, @_, and the nulse constant, 6, 
g 
are fixed. Then m ie fixed. Let the solutions of 411,1) and 
(11,2) for this value of m be np and Ng, respectively. It will 
be shown that nq > Ng, if g > 0.02. ( For steel g = 0.15.) Let 
= he 
