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Page:Popular Science Monthly Volume 89.djvu/329

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Popular Science Monthh/ How to Make a Clevis Lock

��ACLKVIS lock will be foiiiid very useful. The size used to lock a boat can bo made of five-eighths round iron, made in the form of a U.

The eyes must be at least one inch across and drilled to receive a half-inch bolt. The top eye should be counter- sunk or swaged at least five-eighths inch and very nearly through the eye.

The bolt has a thread on one end to fit the lower eye and the other end has a head which can be sfiuare, three- cornered, octagonal, or any shape de- sired. Immediately below this is a collar to keep the bolt from turning in too far.

A piece of gaspipe cut to the required

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A clevis lock of simple construction

��length protects the bolt from being turned in or out.

A small key should be made to fit the head of the bolt, which must be turned in at least one-half inch below the top.

This lock is secure. There is no danger of any one's unlocking it without the key made for it. — F.ARi, B. Sanders.

A Handy Bunsen Burner

THE need of a portable Bunsen burner is often felt by one working in the laboratory. The diagram shows how a very handy and useful device can be rnade.

The fitting from an incandescent gas

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���A handy portable gas-burner

��light may be used for the mixer. This is to be extended to a length of 5 ins. by fitting a short piece of brass tubing. A I -in. piece of brass tubing should be screwed to the other side of the fitting. An ordinary tool handle is drilled to accommodate this tube and it is shoved tightly in place, as shown. This tube affords an attachment for the gas hose. The uses of such a device are countless. It is handier than a gasoline torch for soldering. It may be used for tempering and hardening. Clamped in a retort stand it is of use for many purposes where the ordinary Bunsen burner could not be used. — Robert Kennedy.

A Simple Overflow Alarm

A NOVEL device which tells when the pan underneath an ice-box is about to overflow is easily constructed. On the bottom side or wall of an ice-box arrange a battery A and bell B. Leave the two ends of wire CC, which is an incomplete circuit, hanging down into the drip-pan into which water drips from the outlet D, above. A wooden fioat is i)laced in the pan and on it is attached a copper plate /'". When the float rises the plate is brought into contact with the two ends of wire, completing the circuit and setting off the alarm. — M. J. Silverstein.

���Under side of refrigerator, showing con- struction of warning device

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