. Locomotive engineering : a practical journal of railway motive power and rolling stock . he atmospheric line, or LOCOMOTIVE ENGINEERING line of no pressure (except that of the at-mosphere) shows the amount of back pres-sure. It is probably known by all that theheight of a card depends on the springused. A 100 spring means one that willallow the pencil to be moved i inch inheight for every 100 pounds of steam pres-sure. So with a 100 spring, if the distancebetween the back pressure and atmosphericlines is one-tenth of an inch, the backpressure is one-tenth of 100, or 10 pounds. October, 1900.
. Locomotive engineering : a practical journal of railway motive power and rolling stock . he atmospheric line, or LOCOMOTIVE ENGINEERING line of no pressure (except that of the at-mosphere) shows the amount of back pres-sure. It is probably known by all that theheight of a card depends on the springused. A 100 spring means one that willallow the pencil to be moved i inch inheight for every 100 pounds of steam pres-sure. So with a 100 spring, if the distancebetween the back pressure and atmosphericlines is one-tenth of an inch, the backpressure is one-tenth of 100, or 10 pounds. October, 1900. this, as shown by a straight or nearlystraight vertical line at the end of the card. Having followed the indicator pencilfrom the start back to the finish, we canbegin to compare this card, which is prettynear an ideal one, with two of those shownby Mr. Wildin. These represent a case ofbefore and after taking their tonic inthe shape of a resetting of the valves,which seems to have been needed. Taking No. i, the valve appears to haveadmitted steam at A, or a trifle below it. steam Line. ■Pistons stai-t to move .Valve begins to open Exhaust closes Atmospheric Line LoamMn Enuinimni IDEAL INDICATOR CARO.
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroa, bookyear1892
