manifold pressure and a vacuum pump S to obtain those below atmos- gage is not as great as in the case of the altimeter, its pheric. The difference in height of the mercury col- construction from this angle presents no great diffi- umns of the manometer is measured at each test point. culty. The… … Mercury manorneter- Figure 53.—Manifold or supercharger pressure gage. 20 pounds per square inch. Cover glasses one eighth inch thick and of the diameter required have been found on the average to withstand a differential pressure of over 25 pounds per square inch. It is further necessary to design…
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