Popular Science Monihli/ 



471 



Scale Reading Calipers 



IN the shop it is often necessary for 

 the workman to read dimensions 

 from blueprints that are half size, three- 

 quarter size, etc. The usual practice is to 

 caliper the dimension, transfer it to a 

 ruler, and multiply it in order to get the 

 actual size. It is a very simple matter to 

 fix up \-our calipers so that they will be 



Method of Improving Calipers So as to 

 Eliminate Involved Calculations 



ready directl\-, thus giving the full size 

 without any calculation. 



Measure accurately the distance A, B, 

 and divide it into four equal parts. In 

 the same way lay oft points on .-1 C. 

 These points should be in a straight 

 line, from A to C, and from A to B. 

 Holes should then be drilled at these 

 points and tapped to take small long 

 machine screws. Be careful to drill the 

 holes perfectly straight and perpendicu- 

 lar. 



Now put the machine screws in the 

 holes. If >2 scale is to be read, place 

 them in No. 2 and No. 5; then the 

 distance between the ends of the dividers 

 is just twice that between the machine 

 screws. To read ^4, use holes Nos. 3 

 and 6. Nos. i and 4 give 3-4 size. 



The time spent in making this im- 

 provement will be more than saved in 

 actual use. — R. L. Kenvon. 



Soldering Iron for Light Work 



A SOLDERING copper f(jr light work 

 can be made from a length of 

 trolley wire one end of which is filed to 

 a point and the other end bent to fit 

 into a wooden handle. 



The Completed Iron, Showing Simplicity 

 and Neatness of Its Construction 



Making a Driving-Box Lifter 



THL device wiiich is illustrated here- 

 with is designed to be used for 

 lifting dri\-ing-l)oxes with a traveling 

 crane, for use with planers, boring-mills, 

 drill-presses and the like. It is made 

 from two forgings and a ^'s-in. chain. 

 The two rectangular links are made from 

 :'4-in. iron. The ring is made first, then 

 the rectangle, and lastly the two are 

 welded. The link slips over the driving 

 box and the ring is used in the crane 

 hook. 



Just as soon as the crane hook is 

 hoisted, the two links are drawn to- 

 gether. An accident is practically im- 

 pos-sible. The size of the link can be 

 made to fit any driving-box, though it 

 can be used for any box it will go over, 

 unless the box happens to be very much 

 too small. — Joseph K. Long. 



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Welded Link Made to Fit Any Driving- 

 Eox for Lifting Purposes 



Guide Lines for Lettering 



THESE may be ruled by means of a 

 simple left and right gliding move- 

 ment. Several groups of holes may be 

 drilled in the triangle, thus providing a 

 simple and rapid means of ruling guides 

 for several sizes of lettering. An ad- 

 vantage of this little scheme is the per- 

 fect uniformity of the spacing which is 

 obtained. — W. H. Scheer, Jk. 



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Arrangement of Group of Holes in Tri- 

 angle and Device in Operation 



