524 - APPLIED MECHANICS 
intensifying accumulator, because the pressure of the water on a t 
piston intensifies the pressure of the water onthe ram. The low pi 
sure water enters at A. The action is obvious, and need not be 
described. 
If dis the diameter of the ram, D the diameter of the piston, pil 
pressure of the water on the ram, and P the pressure of the water one 
piston, then, neglecting friction, pa= FD? 
454. Hydraulic Intensifiers.— When a hydraulic machine, 
finishing the operation which it is designed to perform, has 
exert a much greater force than is required during the earlier 
the operation, the increased force may be obtained by the use of : 
intensifier. a 
The intensifying accumulator described in the preceding Article may 
used as an intensifier by first charging the smaller hydraulic cylinder wi 
water, and then introducing the power water from the pumps ints th 
larger cylinder at A. The effect of this will be to raise the pre 
of the water in the smaller cylinder and in the pipes leading a 01 ni 
Generally, however, the hydraulic intensifier has two rams instead 0 
a ram and piston. <a 
If d and d, are the diameters of the smaller and isigeed am 
respectively, p the pressure of the water supplied by the pumps, ang 
the intensified pressure, then, neglecting friction, p,d? = pd}. ‘a 
A hydraulic intensifier, which may be operated to give bie 
different higher pressures, as required, with the same pump pre 
is shown in Fig. 837.* <A is the smaller ram, and this is stati ona " 
B is a cylinder fitting over A, but it is also a ram eg 
C. While C is the cylinder for B, it is also the ram for D; a 
while D is the cylinder for C, it is also the ram for the fixed 0 OU 
cylinder E. + 
On the tension rods FF are placed vee HH, which ha 
lugs KK, which, when brought round into action by ae 
sleeves, prevent D from rising. The sleeves also have lugs LL, 
when brought into action, prevent C from rising. MM are har 
for turning the sleeves to put the lugs LL or LL and KK into or oui 
action. 
The cylinder B and the pipes eee | with it through the i inte 
* American Machinist, Nov. 5, 1904. 
