AMERICAN INSTITUTE. 



163 



and opened ; cannot be fastened opened easily. By unscrewing 

 " F" the valve, spring and washer all come out. All the work- 

 ing parts can be taken out for repair, and be replaced without 

 detaching the cock from the pipe. Not injured by freezing. 



[^ diploma awarded. 



McNab, Carr & Go's Valves, Couplings and Cocks. 



McNab, Carr & Co., 95 and 133 Mercer street, New- York. 



\^A silver medal awarded. 

 Ayers' Cylindrical Filter. 

 W. W. Ayres, Worcester, Mass. 



The invention consists in the combined 

 construction and arrangement of the stop- 

 cock or faucet by which the water is drawn, 

 and the water channels in the filter, by 

 which the water may be allowed to flow 

 inwardly or outwardly, through the cylin- 

 drical filter or shut off entirely from passing 

 in either direction, as the case may require. 

 Figure 1, shows the filter sliglitly in 

 perspective, the lower parts of it being 

 most distinctly represented. 



