. Machinery and processes of the industrial arts, and apparatus of the exact sciences. alve disk for one less extensively perforated, this engineadmits of being worked expansively. The simplicity of its constructionis greatly in its favor. The principal objection to it is the amount ofdead space it necessitates: but this is hardly more than exists in theBehrens engine. boots double piston squabe exg-lxe. One of the most compact forms of steam motor presented by the Expo-sition was exhibited by the Eoot Steam-Engine Company of New York,and called by them the double-piston square engine though c
. Machinery and processes of the industrial arts, and apparatus of the exact sciences. alve disk for one less extensively perforated, this engineadmits of being worked expansively. The simplicity of its constructionis greatly in its favor. The principal objection to it is the amount ofdead space it necessitates: but this is hardly more than exists in theBehrens engine. boots double piston squabe exg-lxe. One of the most compact forms of steam motor presented by the Expo-sition was exhibited by the Eoot Steam-Engine Company of New York,and called by them the double-piston square engine though classed bythe jury among the rotaries. Externally it has the appearance of one,rotation seeming to be directly produced without the intervention of anyperceptible reciprocating or crank motion. By examining the interior,this effect is seen to be caused by two pistons rectangular in form, work- roots double-piston square engine. 97 ing at right angles to each other, and one within the other. Fig. 21 showsthe arrangement. The larger or external piston is in the form of a rec- Fig. Roots Double-piston Square Engine. tangiilar frame working horizontally within a box of similar form, andis marked E. The smaller, marked F, works vertically within the centre of F passes the crank pin, which is carried around
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