190 



STATE HORTICULTURAL SOCIETY. 



made by the Quaker City Machine Company, Richmond, Indiana. The 



power is applied to a hand wheel and by means of a worm, chain, and 



sprocket wheels it is conveyed to the main shaft. This 



machine is simple in its construction and if i)roperly used 



is not likely to get out of repair. It is the most rapid of 



all in its working, as only eleven revolutions of the wheel ^ 



are required to raise the sash from the roof to a horizontal 



position, requiring only about four seconds. The power 



required to do this was ascertained by passing a cord 



around a wheel 15 inches in diameter. This wheel was 



attached to the hand wheel and by means of a sj^ring 



balance we were able to measure the power required for 



each revolution. This showed an average of 20 pounds. 



The Hippard ventilating machine differs from the 

 Evans in connecting the lower with the upper shaft by 

 means of a shaft and gearing, rather than by a chain and 

 sprocket wheels. The connecting shaft is placed inside 

 the iron post of the machine. This machine is slower 

 than the other, but the power required is somewhat less. 

 The manufacturer, E. Hippard, Youngstown, Ohio, claims 

 that the fact that the power can be applied on any side of 

 the machine is a valuable feature that all machines do 

 not possess. All must acknowledge this. This machine 

 is the one at the left in the west house, — Fig. 4. 



The Scollay machine is in some respects similar to the 

 Hippard in the way of conveying the power to the shaft- 

 ing, but the arrangement of its parts is quite different. 

 The simplest form consists of a worm working in the 

 cogs of a wheel on the shafting. The worm is turned by 

 means of a hand-wheel on a piece of gas pipe that is 

 attached to it as seen at the right in Fig. 4. The power 

 is thus applied ( through the worm ) directly to the shaft- 

 ing, and there is no loss of time through gearing; yet, as 

 the machine is arranged, considerably more power is 

 required and the actual time occupied in raising the 

 ventilators to a horizontal j^osition is several times greater (Fig. i3.~Hippard ven- 

 than is needed for either of the other machines. After ti^af^ng Machine.) 

 the machines had been in use several months, and the bearings had 

 become smooth, a comparative test of the efficiency of the different 

 machines was made. 



The apparatus for determining the power was that described as used 

 with the Evans machine. The following is the result, the figures in the 

 first column showing the number of revolutions required to raise the sash 

 to a horizontal position; the second column gives the average number of 

 pounds required to raise the ventilators. This was obtained by recording 

 the power required for each revolution, and taking the average. 



It was found that one half more power was required for the last than for 

 the first revolution. The third column shows the foot pounds, found by 

 multiplying the number of pounds required as power, by the number of 

 feet through which the hand would have to move in raising the sash to a 

 horizontal position. The fourth column shows the time required to raise 

 the sash in seconds. 



