Page:Popular Science Monthly Volume 88.djvu/315

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��Popular Science Monthly

Hydraulic Blowing Arrangement

HE apparatus here described will be

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��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

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