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 tiiis is a collar 

 to keep the bolt from turning in too far. 



A piece of gaspipe cut to the required 



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B01T6 P/PE SLEEVE 



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BOLT 

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LOOSE P/PE SLEEI/E^ 

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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 



GAS HOSE - 



uooo 'fANDte^ 



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 



