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Popular Science Monthly 



Hydraulic Blowing Arrangement 



HE apparatus here described will be 



287 



found very useful for supplying air 

 to small blow-pipes in glass-working, 

 etc., also for wood-burning and in jew- 

 elers' work, as it leaves both hands free 

 to work. By reversing the valve it may 

 be used for purposes requiring a small 

 suction. 



Fig. 1. The hydraulic blower is useful 



for supplying air to small blow-pipes, as 



it leaves the hands free 



The apparatus is simple and easily 

 constructed. Fig. 1 shows the general 

 plan, where A and B are cans of the de- 

 sired capacity (1 gal. being a good size) 

 mounted on the wooden frame work 

 with a pipe containing a faucet, H, sol- 

 dered between them. The cans are fast- 

 ened to the wood with a metal clip, E, 

 which is screwed to the wood and solder- 

 ed to the cans. The inner framework is 

 mounted on a shaft, G, supported by the 

 outer framework, and the cans are kept 

 from turning by the pin, F. The tubes, 

 7*2 T3, should be made of copper or brass 

 where they extend into the cans and the 

 part outside the cans may be of copper, 

 brass or rubber. 



To operate, the top can is filled with 

 water and the rubber tube T, which 

 leads to the blow-pipe or other appara- 

 tus, is connected to the lower can. The 

 faucet H is then opened, permitting the 

 water to flow from the top can into the 

 lower one, thus forcing the air out of 

 the latter, the flow of air being regulated 

 by the flow of water. 



\\ hen the top can is empty the posi- 

 tion of the cans is reversed and the hose 

 is changed to the lower can. 



To do away with the changing of the 

 hose, however, a very simple valve, 

 which works automatically with the re- 

 versing of the cans, may be used. 



The materials needed for the valve are 

 as follows: IVi'' of %" brass tubing, 

 three pieces brass tubing %" long to fit 

 in rubber hose, IVi'" of brass rod with 

 8/32'' thread, four 8/32" nuts, four %'' 

 brass washers, two V2" leather washers, 

 and two 4/36'' screws. 



The W brass tube T (Fig. 2) is 

 drilled for the tubes Ti, T2 and Tj and 

 drilled and tapped for the machine 

 screws 5. The small tubes are then sol- 

 dered to the large one as shown. The 

 nuts D and leather washers B and brass 

 washers C are placed on the shaft, which 

 is then inserted in T after adjustment for 

 right between head distances. The screws 

 ^^.S" are put in to prevent the moving part 

 from slipping out either end. The valves 

 should be oiled and the corresponding 

 tubes connected. The weight IV is made 

 of lead just heavy enough to work the 

 valve. 



The valve is placed on the framework 

 to which the cans are fastened. 



When the valve is in the position 

 shown the air comes from the lower can 

 through Tj, through the valve, and out 

 of Ti to the blow-pipe or other appara- 

 tus, while T2 is open to receive air. 



Inverting the weight shifts the valve 

 so that the blow-pipe or other apparatus 

 is always connected with the lower can. 



Fig. 2. Showing how the brass tube is 

 tapped for tubes and screws 



