The Practical mechanic's journal . 220. 232. 26-8. 284. 304. 32-0. 33-4. Average effect on Piston, 29-82 lbs. Fig. Expansion Low-Pressure 56. 7-2. 7-S. 8-0. 9-0. 10-2. 120. Average effect on Piston, 7-52 lbs. The third figure is taken from the low-pressure cylinder, as at presentworking with the exhaust steam of the high-pressure cylinder; it is ona scale of lOths, and exhibits an average pressure of 752 lbs. Thesediagrams shew that when the low-pressure cylinder is working belowthe atmospheric pressure, a partial vacuum is obtained in the high-pressure one. The relative c
The Practical mechanic's journal . 220. 232. 26-8. 284. 304. 32-0. 33-4. Average effect on Piston, 29-82 lbs. Fig. Expansion Low-Pressure 56. 7-2. 7-S. 8-0. 9-0. 10-2. 120. Average effect on Piston, 7-52 lbs. The third figure is taken from the low-pressure cylinder, as at presentworking with the exhaust steam of the high-pressure cylinder; it is ona scale of lOths, and exhibits an average pressure of 752 lbs. Thesediagrams shew that when the low-pressure cylinder is working belowthe atmospheric pressure, a partial vacuum is obtained in the high-pressure one. The relative capacities of the two cylinders are as 1 to4, but Mr. MNaught intends in future, we believe, to arrange them inthe ratio of 1 to 3, as thereby a larger useful effect may be obtainedwithout the employment of excessive high pressure. The savinin fuel is the more evident when we refer to the first figure, andsee the good state of working of the valves previous to the altera-tion. Another point connected witli the consumption of fuel is also tobe taken into consideration; that is, the supply of steam required forheating the dressing cylinders, pipes, and ot
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