Machinery and processes of the industrial arts, and apparatus of the exact sciences . onally movable) fulcrum,against which the steam must react in order to move the piston. On thisaccount there is scarcely a single rotary engine in existence in whichthere is not great loss of effective pressure in consequence of the pres-ence of steam behind the piston, and not one which could bear enlarge-ment to the dimensions required to propel an ocean steamer withoutsuch loss on this account as to make it economically unavailable. THE BEHRENS ROTARY ENGINE. The Exposition has presented several forms of r
Machinery and processes of the industrial arts, and apparatus of the exact sciences . onally movable) fulcrum,against which the steam must react in order to move the piston. On thisaccount there is scarcely a single rotary engine in existence in whichthere is not great loss of effective pressure in consequence of the pres-ence of steam behind the piston, and not one which could bear enlarge-ment to the dimensions required to propel an ocean steamer withoutsuch loss on this account as to make it economically unavailable. THE BEHRENS ROTARY ENGINE. The Exposition has presented several forms of rotary engine whichseem to be superior to most of their class. Of these the most remarkableis an American invention, patented in this country in 1866, and subse-quently in Great Britain, France, and Belgium. The construction oxthis engine can hardly be explained without reference to figures. Its ROTARY STEAM-ENGINES. 83 general external appearance is represented in the perspective viewannexed, Fig. 9, and its interior is shown in section in the several fig-ures, 10, 11, 12, and Behrens Rotary Engine. It will he seen that there are in the same solid casting two cylindricalcavities which overlap each other. In the centre of each cylinder is asolid cylindrical core. Between each of these cores and the surface ofthe corresponding cylinder is a piston of peculiar shape, being part of asolid ring, filling up the intermediate space as far as it goes, and fittingboth to the cylinder internally and to the core. These pistons are firmlyattached to axes, which appear in section at 0 and C in the figures. 84 PARIS UNIVERSAL EXPOSITION.
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Keywords: ., bookcentury1800, booksubjectmachinery, booksubjectscientificappa
