. Meccanismo moderno, che mostra gli ultimi progressi in macchine, motori, e la trasmissione di potenza, essendo un volume supplementare alla ciclopedia di Appletons di meccanica applicata. Iston nel caso di difragm in Fig. 6. Qualsiasi aumento di pressione solleva in modo imme-diately il pistone echiude la valvola rotativa per mezzo della cremagliera, ^1, e segmento,F qualsiasi diminuzione di pressione apre la valvola. La valvola rotarivalvola con luci a V è azionata da un pistone con diaframma di arolatura, fornendo così una corsa lunga e graduatail flusso di gas con la massima precisione. La forma conica della valvola ammette la sua b

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. Modern mechanism, exhibiting the latest progress in machines, motors, and the transmission of power, being a supplementary volume to Appletons' cyclopaedia of applied mechanics . iston in the dia-phragm case in Fig. 6. Thenany increase of pressure imme-diately raises the piston andcloses the rotary valve by means of the rack, ^1, and segment, F any decrease of pressure opens the valve. The rotaryvalve with V-shaped ports is operated by a piston with arolling diaphragm, thus giving a long stroke and graduatingthe flow of gas with the greatest accuracy. The conical formof valve admits of its being ground to a gas-tight joint, notaffected by contraction or expansion, and requiring no packingaround the valve-stem. The jiorts have cutting edges and ashearing motion, thus effectually preventing the formation ofice or the accumulation of foreign matter on the valve seats, which so often prevents the closing of other forms of valves.By the rotary motion of the valve, and its opening and clos-ing both ways from the center, a positive cut-oft is effected Regulator, made bythe Union Water Meter Co., Worcester, Mass., is shown in Figs. (!, IlG. 8.—Union regulator. Detail.. Fi(i. 9.—Curlii prc-Mire regulator RIVETING MACHINES. 739 without extra mechanism, the weight of the piston closing the valve whenever the supply of gas fails. Nor can any leak around the piston or diaphragm, or increased pressure of gas, force the valve open and allow the gas to blow through. The Curtis Pressure Regulator, made by the Curtis Regulator Co., of Boston, shown inFig. 9, has a main valve, operated by a loose-fitting piston a secondary valve in the top ofthe chamber over the piston ; a metallic diaphragm (performing the double office of oper-ating the secondary valve, and making a joint to the cap which contains it); and a sidepassage, connecting the chamber under the diaphragm with the outlet. When the springover the diaphragm is compressed, it opens the secondary valve upon which it rests.P

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