Scientific American Volume 47 Number 18 (October 1882) . o that if two of the valves are closed, the twoothers are of necessity open, and reciprocally; or, inother words, if the inlet and the top of the piston arein communication, the bottom of the piston neces-sarily communicates with the outlet, and mee versa. Inthe center of the distributing box there is fixed abracket of hard bronze, which holds in a lower groovea knife whose back serves as a bearing point for a stir-rup-shaped spring. The center of rotation of thisspring, which consists of six strips of Princes metal, is in thevertical ax
Scientific American Volume 47 Number 18 (October 1882) . o that if two of the valves are closed, the twoothers are of necessity open, and reciprocally; or, inother words, if the inlet and the top of the piston arein communication, the bottom of the piston neces-sarily communicates with the outlet, and mee versa. Inthe center of the distributing box there is fixed abracket of hard bronze, which holds in a lower groovea knife whose back serves as a bearing point for a stir-rup-shaped spring. The center of rotation of thisspring, which consists of six strips of Princes metal, is in thevertical axis of the knife. Owing to such an arrangement,the knife, rolling at one side in the bracket, and at theother on the spring, is always pushed to the right or leftwithout ever resting in the median position, which is one of through its action on the knife-arm, an opposite effect, butone that is identical with that just described. Finally,during the ascent of the piston, a pawl carried by the lattercauses a cast iron ratchet-wheel to advance by one spring might compensate for the wear on these parts, theinventor desired to obtain certain data in regard to tljispoint. So, with a file, he executed the work of time on theknife, and, with thirteen pieces worn away each a half mil-limeter more than the other, he undertook a series ofexperiments on meters of 002 of a meter orifice. Thesubjoined table shows the results of these trials undera pressure of water, at the inlet, of 30 meters: Height ofKnifeln Milli- Power of Discharge Spring in Kilo- ill liters Observations. meters. grammoters. per hour. 33 (Normal). 4k.(]Srormal). 8,000 Operation good k. 8,000 * 23 k. 8,000 <( 8,000 ** 21 k. 8,000 it k. It 20 k. tt k. 8,000 (( 19 8,000 if 8,000 tt 18 k. 8,000 Expansion lessfree. k. 8,000 Meter stops; the 17 k. 8,000 water does notflow.
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectpatente, bookyear1882
