314 Cooper's Rotative Piston. 



« 

 Vermont, and was matured bj^ him without the aid of sci- 

 ence, or the benefit of a practical knowledge of mechanics. 



The legislature of Vermont incorporated Mr. Cooper and 

 his associates, by the name of the American Hydraulic Com- 

 pany, who are now manufacturing machines under the patent. 

 As this principle and one similar to it are appUcable to steam 

 and a variety of other purposes, for which the company are 

 taking patents from some of the European governments, a 

 detailed description of the principle, and explanatory plates 

 will be dehiyecl for a succeeding number. 



Plate 1 represents the engine of size No. 7, worked by six- 

 teen men in three positions — a is a side view with the suc- 

 tion hose upon the carriage, and without the cranks — 6 

 shows the rear of the engine and the situation of the cranks 

 when in the working position ; c the front of the engine with 

 the crafiks reversed, as when the engine is moved from place 

 to place. 



Phite 2 represents the engine of size No. 3, worked by 

 eight men. This number has but one pair of cranks as will 

 be seen by the side view in a. The three positions are rep- 

 resented as in plate 1. 



The result of several experiments is given, to enable the 

 reader to make a comparison with the engines of the old 

 construction. 



An engine on the rotative principle, of the size marked 

 No. 11, v/oiked by sixteen men, with eleven inches lever, dis- 

 charged through a four inch pipe, more water than three 

 eight inch cylinders, with nine inches stroke and fifteen inch- 

 es lever worked by thirty four men — and as much water a? 

 four six and a half inch cylinders, nine inches stroke, worked 

 by thirty six men with twenty four inches lever. This exper- 

 iment was made at the corporation yard, in the city of New 

 York, in September 1827. 



The same engine with twelve men, eleven inches lever, 

 threw more water than two engines (New York and Hydrau- 

 lion,) in the city of Boston, worked by thirty six men with 

 twenty four inches lever. This experiment was made in 

 State street, Boston, in September, ] 827. 



No 7, rotative engine, with twenty men exerting an esti- 

 mated pou'er of thirty five pounds per man, with seven inch- 

 es lever, threw from an inch pipe one hundred and fifty six 

 feet horizontal, and one hundred and nine feet in height. 

 The atmosphere was at the temperature of 42° and perfect- 

 ly calm. 



