. Scientific American Volume 03 Number 17 (October 1860). begun upon, and the cut-offchanged. This was continued for twelve experiments,and the average result was 1,254 revolutions, with thecut-off at ono quarter, and 798 at the full stroke, beinga little over 57 per cent gain by the use of the cut-off. There would be many ways to judge of the reliabilityof these experiments, if any one were present. For in-stance, the moment the full stroke was put on, the lire-men had to increase their efforts to keep up steam, andthis was invariable through all the experiments, thefull stroke having the ste
. Scientific American Volume 03 Number 17 (October 1860). begun upon, and the cut-offchanged. This was continued for twelve experiments,and the average result was 1,254 revolutions, with thecut-off at ono quarter, and 798 at the full stroke, beinga little over 57 per cent gain by the use of the cut-off. There would be many ways to judge of the reliabilityof these experiments, if any one were present. For in-stance, the moment the full stroke was put on, the lire-men had to increase their efforts to keep up steam, andthis was invariable through all the experiments, thefull stroke having the steam low, and the cut-oft havingit high. In experiment No. 4, one of the firemen wentto dinner, and the full stroke run down the steam 20pounds ; the cut-off took it and brought it back, but bydoing so fell off say from 115 revolutions for two hun-dred pounds of coal down to 93, but this was countedas though nothing had occurred. I send you five diagrams taken along through the trialsthat any one acquainted may see the condition of valves, Ncl. ECCENTRIC. as it was working, I could send you many more, but thisperhaps is more than is neeessary. It has been our aimto take cards from the engines daily, and lay them awayfor future reference. Thinking that even these experiments might notprove entirely satisfactory to the advocates of non-expansion, I yesterday went over with as many as Icould during the day, with different firemen selected, sothat they could not know what were our designs. Thediagrams, 11, 12 and 11 were taken yesterday, No. 1aad 2 taken the 17th No. 3 is from the cam engine,merely to show the state of that engine ; we have notbeen obliged to run more than one wheel, and this haslain still. The result of yesterdays experiments are 108 revolu-tions with the cut-off, and 73 with full stroke. Thewater in the river steady at 5 feet 3 inches ; in the canal6 feet 4 inches raised to 7 feet, which is the highestpoint we pump. I would remark that every part of themachinery wa
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