94 Transactions of the American Institute. 



is eminently calculated to impart a stead}-, uniform motion to the 

 wheel. "We commend it to ^our consideration as worthy of a first 

 premium. ' 



HYDEArLic Gauge. 

 iNo. 490. Ilydraulic Pressure Gauge. — Thos. Harbottle, Brooklyn, 



]sr. Y. 



An excellent gauge; but there are many others in the market 

 equally meritorious. 



Bloweks. 



1^0. 11-1:2. Pressure Bloioer. — B. F. Sturtevant, Boston, Mass. 



We examined this blower witli much care, and were highly pleased 

 with the general excellence of the design, the careful study bestowed 

 on the parts, and the superior mechanical skill displayed in the manu- 

 facture. While we recognized the fact that the perfect fit of the fan, 

 in conjunction with the curvilinear form of the case, renders possible 

 a much higher pressure than can be procured from fan blowers of 

 ordinary construction, we are unable to class it among what are 

 popularly termed " pressure blowers," but consider that it occupies 

 an intermediate position between a simple fen and a positive pi'essure 

 blower. To particularize the many desirable features in their design, 

 would be tantamount to giving a description of all the parts, a subject 

 too extended for the narrow limits of our report. We recommend 

 that a first premium be awarded to Mr. Sturtevant, for a fan blower. 



[N'o. 418. The Multiple Fan Blower. — P. Clark, Eahway, K. J. 



This blower justly attracted much attention. The inventor has 

 aimed to accelerate the speed of the blast delivered from the ordinary 

 fan blower, by passing the air successively through two or more 

 similar blowers, and finally discharging it from the last under a pres- 

 sure as many times greater than its initial as there are distinct blowers 

 in the combination. That he has accomplished the same, was abund- 

 antly proved by a careful test to which the blower was subject. One 

 of the blowers, composed of four separate compartments, containing 

 as many fans on one shaft, was operated at a fair speed of 1,500 revolu- 

 tions per mimute, whereupon sevel-al attached syphon gauges indi- 

 cated pressures corresponding with two, four six and eight inches of 

 water. The belt Avas then throw ofi', the first three compartments 

 with their fans removed, and the remaining fan operated in its case, 

 at the same speed as before. The gauge under these circumstances 

 indicf^ted two inches depression, conclusively showing that the pres- 



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