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Figure 2. A, piston; B, cylinder; C, hardened steel point, on which the 

 equilibrating weights are hung; D, stop, preventing too long a stroke of the 

 piston either up or down. In this stop is placed the rod by which the rotary 

 motion is imparted to the piston to increase sensitiveness. E, guide to in- 

 sure the upper part of the piston moving rigidly in a straight line. F, rubber 

 packing. G, steel washer, retaining the rubber packing. H, easily collapsible 

 rubber tube, containing the viscous mixture of molasses and glycerine. I, con- 

 nection to the high pressure pump. The thin mixture of water and glycerine 

 transmitting the pressure is injected through this hole, acts on the outside of 

 the rubber tube H, and so transmits the pressure to the piston A. 



