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Popular Science Monthly 



Making an Electric Lantern from a 

 Flashlight 



SMALL tubu- 



A^ 



lar flashlight 

 of the double tung- 

 sten battery type, 

 s5, of about iM-in. 

 diameter, may be 

 " converted into lan- 

 tern form at a small 

 cost. The regular 

 type of dry battery 

 is used, being 

 cheaper and more 

 durable. 



The body of the 

 lantern is made of 

 " " "'" '"' galvanized iron. Its 



base is 2k4. ins. by 33^ ins. square, and 

 its height is 9 ins. Two 10-32 machine 

 screws are let through two opposite 

 sides near the top, and soldered in place. 

 The handle is drilled at each end, slipped 

 over the screws and fastened on the out- 

 side with small brass nuts. Two notches 

 are made in the cover to enable it to 

 set down over the screws. 



The lens, metal ferrule and cap are 

 removed from the fiber body of the 

 flashlight and soldered to the front of 

 the battery box, as shown in the 

 illustration. The switch may be used 

 by mounting it as shown. One ter- 

 minal of the battery is grounded to 

 the box; the other runs to the switch 

 and from there to the bulb. After 

 giving the box a coat of black enamel, 

 the lantern is finished. It is in many 

 ways an improvement over the original 

 flashlight. — A. Dane. 



Driving Screws in Inaccessible Places 



DRIVING a 

 set-screw in 

 a place too small 

 to admit the fin- 

 gers to hold the 

 screw may be ac- 

 complished as 

 follows : 



Roll a piece of 

 paper into a cor- 

 nucopia with the hole just a trifle smaller 

 than the screw. By dropping the screw 

 into this and holding it in the hole with 

 as light pressure on the screwdriver you 

 can drive the screw home. 



T 



A Home-made Ice-Mold 



O help reduce 



the high cost 

 of living, many 

 people would 

 freeze their own 

 ice during the win- 

 ter months if they 

 had molds that 

 were practical and 

 inexpensive. Get 

 at a furnace shop an old hot-air pipe, 

 the larger the better. Cut into sections 

 about two feet long and press into square 

 tubes to afford a chance for the expansion 

 of the freezing ice. For each tube or 

 mold, make a pan for it to set in by 

 bending up the four edges of a sheet of 

 tin, making the pan about two inches 

 deep. Fill the pan with water, place a 

 tube in it and the first night's freeze will 

 give a solid ice bottom. Add each day 

 as much water as will freeze hard, till 

 the mold is full. Put into the refrigera- 

 tor, without removing from the mold. 

 As many tubes can be used as desired or 

 con^■enient. 



How to Etch a Water- Set 



THE easiest method of frosting glass 

 is by means of hydrofluoric acid. 

 A complete water-set can be beautifully 

 etched with very satisfactory results. 



Procure a water-set of any description ; 

 the quality of the glass makes no difi^er- 

 ence with the frosting process. Dip 

 each piece in melted paraffin, being sure 

 that every point is covered. After 

 cooling, inscribe, with a knife-blade or 

 etching-tool, the letters or design to be 

 used, and see that the wax is entirely 

 removed from the design. 



Place all the pieces in a box, lined with 

 heavy Manila paper. Also set a bottle 

 of hydrofluoric acid in the box. Do 

 not remove the acid from the original 

 container, since it will eat through 

 glass; simply remove the stopper and 

 place a cover over the box. The fumes 

 of the acid will act on the glass so long as 

 exposed. From 36 to 48 hours give a 

 good heavy frosting. 



This method can be used on electric 

 bulbs, glass doors or any glass that can 

 be properly exposed to the hydrofluoric 

 acid fumes. The acid will keep for 

 months. — L. E. Fetter. 



