tkan:sa.ctioiNS of section g. 885 



Further, there is the necessity for equalising the power thus intermittently 

 given off by means of a heavy fly-wheel. 



Several attempts have been made to obtain a satisfactory engine upon the other 

 cycle, viz., that nnder which impulse is obtained at every revolution. This result 

 was accomplished by the old type of Stockport engine, by Mr. D. Clerk's engine, 

 and others ; but in all these engines a second cylinder was provided in which a 

 supplementary piston did the work alternately done by the working piston in 

 the cycle first referred to. 



This led to complication and loss of efficiency, and the principle has, speaking- 

 generally, been abandoned. 



"NMth the object of combining the advantages of both systems the writer 

 developed and completed the engine now known as the ' Day ' gas engine. 



In this engine simplicity has been the pruicipal object sought, and it is difficult 

 to see how a gas engine could be made to work with simpler or fewer parts. 



The construction of the engine is as follows : — 



The piston is of the trunk form, and through a connecting rod works on to the 

 crank pin. The crank works in an inclosed chamber, the crank shaft projecting 

 through a boss bearing, terminating in a gland. 



On the upward stroke of the engine it is obvious that a partial vacuum is 

 produced by the retreat of the piston, and this vacuum is taken advantage of to 

 induce a flow of gas and air, in controlled proportions, into the crank chamber 

 through an automatic reflex action valve. It is equally clear that on the down- 

 ward movement of the piston the mixture thus introduced is compressed — in 

 practice, it is compressed to about 2 lb. to the inch — and by this means ia 

 possessed of sufficient motive power to charge the working end of the cylinder. 

 This is accomplished by the following device : — C!ommunicating from the crank 

 chamber to the lower part of the working end of the cylinder is a port or passage, 

 and this is closed by the piston until the latter, at the end of its stroke, uucoA-ers 

 it. Immediately tlie gas mixture, being compressed as explained, flies up through 

 the passage and charges the cylinder ; the piston returns, closes the port, com- 

 presses the mixture in the usual way against an ignition tube, and an explosion 

 results, causing the descent of the piston. The exhaust of the waste products is 

 accomplished by the opening of a somewhat similar port communicating to the 

 atmosphere opposite the inlet port above described, which is opened by the piston 

 slightly in advance of the opening of the inlet port. Thus, when the incoming 

 charge is admitted, the explosion in the cylinder has been reduced to atmospheric 

 pressure. The incoming charge is made to assist in the clearance of the waste 

 products by its being diverted upwards by a fin on the top of the piston, and thus 

 setting up an eddying action, tending to drive out the contents of the cylinder 

 through the open exhaust port. Thus it will be seen that with one piston and 

 one cylinder an impulse is obtained at every revolution of the engine. It will also 

 be apparent that the engine will run with equal facility and efficiency in either 

 direction. 



The speed obtainable is very great, there being no tappets, cams, or levers, 

 and in a small engine as much as 1,100 revolution.^ per minute have been obtained. 

 At this speed firing was irregular, but at 500 revolutions the explosions were 

 absolutely regular. 



For the same reason the engine runs extremely quietly. 

 The writer claims to have produced an engine — 



(1) With fewer working parts than any other. 



(2) That occupies less .space. 



(3) That without any alteration will run in either direction. 



(4) That, owing to the absence of friction, possesses a high degree of 



mechanical efficiency. 



(5) That runs more silently than any other gas engine. 



