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Show BOYS' HANDICRAFT j By A. NEELY HALL Author of 'Handicraft for Handy Hoy ' and"! ne Boy Craftsman" Jl FlG-6' jljl j CANDLE A 'ZIh BOX . DjiT' B?1J C (D) hole through ,4 C f1 I'll ll fl r '"' 4HUTTIB (e'l'. 1 i vl1 -u-' a !i Rubber- T'i!! 1 1 Section ' InsFDE. F "Box- 0 Fig. 2- Fig 3 A SIGNAL TELEGRAPH. Here is a simple piece of apparatus with which you boys can communicate communi-cate with one another after dark, from your bedroom window to the boy who lives across the street, or from your tree club house to a boy upon the ground, or if you go camping in the woods you and your companions can flash messages from one place to another. an-other. Get a box about 12 'inches long, 8 inches wide, and 8 inches deep, for your signal box. This will be the most convenient size. Fig. 1 shows the completed piece of apparatus with the key that controls the lengths of the signal flashes (A) in operations, while Fig. 2, a cross section, and Fig. 3, a view of the inside of the box, explain ex-plain how the flashes are made. You will see by these illustrations that when the key lever A is pushed down it pulls up, by means of a cord (B), a shutter (C), until the hole bored through its center (D) coincides with a hole in the front of the box (E) Make the shutter block about 4 by 5 Inches in size, and bore the hole through it and through the box front about IV2 inches in diameter (Fig. 4). Screw a screw-eye into the center of two opposite edges of the shutter block (F), anoiror screw-eye to the Inside of the box 3 inches above hole E (G), and another into the bottom of the box under bole E (II. Fig. 3). Cut the key lover stick A enough longer than the inside depth of the box so its key end will stick about Wi inches outside of the box (Fig. 2). Prepare the key end as shown in Fig. 5, screw a screw-eye into the stick at !, and hinge to the inside of the front )f the box '2 inch above the bottom (Figs. 2 and 3). Tie a piece of stout jord to the upper screw-eye F, slip it through strew-eye G and tie to screw-eye I (Fig. 3), allowing just enough length so when the key stick Is perfectly horizontal I he two tioles D and E will come opposite one another. an-other. Connect the lower screw-eye F and screw-eye H with a heavy rubber rub-ber band (J). This will spring the hutter back to the position shown in Fig. 3, and raise the key end of the lever stick to the position shown in Fig. 2. Drive a couple of small nalla into the box at' the proper height so the shutter will strike against them when raised until holes D and E come opposite (K, Fig. 2 and 3). Use a tallow candle for lighting your lantern, and tack a can cover (L) with a carpet tack driven through its center from the bottom (Fig. 6) to the bottom of the box as a holder (Fig. 2). A large hole in the top oi the box will carry off the heat from the candle (M, Fig. 3), but it is best to fasten a can with both ends removed re-moved in the hole for a chimney (N, Figs. 1 and 2). Make the back of the box out ol three pieces (O, P, and Q, Fig. 1). Cut a notch in the edge of strip O in the proper place and of the right size I - MORSE CODE- A p li B Q 2 C .- R -- 3 D S 4 E T - 5 F -. U 6 G V 7 H W 8 I X 9 J Y - O K Z L & - - n ; -FiG.7- 10 I? I for the lever stick to work In. Screw the wooden button R to strip O as a means for locking the door. Communication is carried on by means of long and short flashes ol light. A short flash is made, ol course, by a quick tap upon the key, and a long fish by holding the key for an instant. Use the Morse telegraph tele-graph code aB your signal code, using the short flashes for the dots and the long ones for the dashes. The code is shown In Fig 7. Cut this out and paste it to the back of the box, as shown in Fig. 1, so you will have It there for reference when operating the light. (Copyright, 1912, by A. Neely Hall.) |