MECHANICS AND USEFUL ARTS. 63 



of high velocities. Time alone can decide the question, whether or 

 not this maximum power is really obtainable. 



5. The great weight of the engine, and space occupied by it in its 

 present form, will in all probability, prevent its adoption for the pur- 

 pose of inland navigation and railroad locomotion, in preference to 

 the steam engine. If used as a land engine, the features will be less 

 objectionable ; accordingly it is only in this form of application, and 

 in those cases of marine navigation in which speed is likely to be 

 sacrified to economy of fuel, that the caloric engine may be confi- 

 dently expected to achieve decided triumphs over the condensing 



steam engine. 



Although this discussion has brought us to the conclusion that the 

 new motor is not likely to equal the extravagant expectations which 

 are so widely entertained with regard to its capabilities, still it must 

 be freely conceded that the invention of a new engine in respect to 

 which a just claim to superiority over the steam engine can be asserted, 

 in any particular, is a great achievement, and that the ingenuity and 

 mechanical skill displayed in the invention and construction of the 

 Caloric Engine cannot be too highly extolled. 



REGULATING THE SPEED OF STEAM ENGINES. 



Luther R. Faught, of Macon, Georgia, has invented a very ingeni- 

 ous and original improvement for regulating the speed of steam 

 engines, by cutting off' the steam in the steam box when it exceeds the 

 established velocity. The speed of the engine is regulated by the 

 " cut-off," which consists of a plate of metal placed to fit and work on 

 the back of the slide valve, which is furnished with cerlain openings 

 through which the steam must pass into the cylinder while the cut-off 

 plate is in a proper position. The form of this cut-off is not new, but 

 the method of operating it is peculiar: the cut-off is caused to move 

 with a slide valve by means of friction produced between them by- 

 suitable means, and by attaching the rod of the former to a pendulum 

 axis or other device, capable of offering resistance to its movement, 

 which causes it, when the velocity increases, to move a shorter distance 

 than the slide valve and thus close the steam openings of the valve, 

 and cut off the steam before the termination of the stroke of the piston. 

 The steam passages of the slide valve are closed earlier cr later, 

 according to the velocity of the piston, by the action of this governor 

 valve, to regulate the speed of the engine. The governor valve is 

 therefore operated by resistance which increases as the undue velocity 

 of the engine increases, to cut off the steam early when necessary. 

 Scientific American. 



LOCKING AND COOK'S ROTARY AND VALVE ENGINE. 



In this engine a metal disc, with three apertures, slowly rotating on 

 a flat surface, with corresponding openings connected with the boiler 

 and the cylinders, supplies the place of the ordinary slide valves, 



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