The U.S. Patents of Nikola Tesla

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This latter readily accomplished making provision for the at­ tachment the piston rod one more weights h'. The cylinder the con­ trolling engine formed the casing intermediate the two main cylinders but 95 allotheressentialrespectstheconstruction and mode opei’ation ofthe controllingengine re­ mains described connection with Fig. In. An engine the kind described possesses many and important advantages. Whatever may the load the main engine therefore the steam admitted 80 to the cylinder defined intervals, and thus any tendency change the period of vibration the main engine overcome. The control the main engine the en­ gine constant period may effected 85 other ways—of which Fig. The rate or period reciprocation the piston, however, 55 more dependent upon the pressure ap­ plied drive it, than would the period of oscillation pendulum permanently main­ tained vibration, upon the foi-ce which pe­ riodically impels it, the effect variations in 60 such force being merely produce corre­ sponding variations the length Stroke or amplitude vibration respectively. In the pi’esent case, however, the controlling engine not designed nor adapted per­ form other work than the regulation the 125 period the other, and moreover en­ gine defined character which has the capa­ bility oscillating movement constant period. the figure have shown two cyl­ inders placed end end with piston B and each. 1. In another application even date here­ with have shown and described two recip­ rocating engines combined such manner 120 that the movement operation one de­ pendent upon and controlled the other. The reciprocating move­ ment the piston may converted, the ordinary mechanisms into rotary motion 115 it may utilized and applied any other manner desired, either directly indirectly. The movements of the piston compress and rarefy the air the cylinder opposite ends the same alter­ nately, and this results the heating the 40 cylindei'. But since variation the tem- perature the air the chamber would af­ fect the rigidity the air spring, maintain the temperature uniform surrounding the cylinder with jacket which open 45 the air and filled with water. The piston secured rod which ex­ tends through the cylinder heads, the lower end carrying the slide valve above described and the upper end having secured a 15 plungery cylinder fixed the cylinder a and line with it. The special construction this de­ vice may varied considerably, but de- 5 sirable that all the ports, and more particu­ larly, the exhaust ports made larger than is usually done, that force due the ac­ tion the steam compressed air the chambers will tend retard accelerate the i movement the piston either direction. this case the piston the controlling engine constitutes the slide valve of the main engine, that the latter may be considered operated the exhaust the 90 former.6. and 105 indicated the dotted cii’cle the center of the piston. What claim is— 130 1. The inlet port for the admission the steam the control­ ling engine similar that Fig. If steam gas under pressure admit­ ted through the port either side the piston b,the latter, will understood, may be maintained reciprocation, and free to 25 move, the sense that its movement either direction ceases only when the force tending to impel and the momentum which has acquired are counterbalanced the increas­ ing pressure the steam that end the 30 cylinder toward which moving, and in its movement the piston has shut offat given point, the pressure that impelled and estab­ lished the pressure that tends return it, is then impelled the opposite direction, and 35 this action continued long the requi-.517,900 municate through openings the same with the cylinder chambers opposite sides the piston. site pressure applied. much more perfect regulation and uniformity ac- no tion secured, while the engine simple and its weight fora given capacity very greatly induced. The cylinder with­ out ports any kind and air-tight except that leakage may occur around the piston rod which does not require very close fitting, 20 and constitutes ordinary form air spring. The pe­ riod mainly determined the rigidity of the air spring and the inertia the moving 65 system and may therefore secure any pe­ riod oscillation within.very wide limits by properly proportioning these factors, by varying the dimensions the air chamber which maybe equivalent varying the rigid­ ity the spring, adjusting the weight 70 of the moving parts. The exhaust ports howevei’, constitute the inlet ports the cylinders and the ex- 10c haust the latter effected through the ,ports which are controlled the pis­ tons and respectively. will serve an illustration. such engine that just above de­ scribed the normal pressure will produce a stroke determined length, which may be increased diminished according the in- 50 crease pressure above the reduction of pressure below the normal and due allowance is made constructing the engine for va­ riation the length sti’oke. The combination with the cylinder and reciprocating piston and controlling valve of an engine adapted operated steam or gas under pressure independently . Since the only work which the small engine has perform the reciproca- 75 tion the valve attached the piston rod, its load substantially uniform and its pe­ riod reason its construction will con­ stant