Assuming the proportions to be 1 to A 1,000, the 1,000 lb.
pressure on the plunger means only 1 lb. pressure in the fluid chamber,
above piston head, E, and this greatly reduced pressure is now
susceptible of measurement by any of the ordinary light pressure
instruments for measuring pressures. All the passage ways connecting to
dial gauge, R, with the fluid chamber above piston, E, are filled solid
with fluid, permitting no air spaces that can be avoided. The steel plug,
L, that forms a passage way between the fluid chamber and the dial gauge,
is provided on one side with a small screw hydraulic pump, with a
reservoir supply of fluid. This part is shown in longitudinal section;
the steel plunger, I, is firmly secured to wheel, F, the long hub, H, of
which is provided with a screw thread on its inner side, which thread
screws upon the exterior of pump barrel, K. After first filling the
interior of the pump barrel with fluid, the said hub is screwed upon the
pump barrel, causing the plunger, I, to force the fluid into the fluid
chamber and passage way leading to the dial gauge, causing the hand or
pointer to move to any predetermined pressure on dial, in advance of
pressure applied in the high pressure chamber at D.
Pages:
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48