Show new 4 ideas for ter handy bov boys s by A NEELY arow of TIAMI craft arr thandy dom n day Crafft wes et e za ri c I 1 am r AN EASILY MADE ELECTRIC DELL BELL OUTFIT tho the homemade home made electric bell shown sho a in the illustration illustrations Is in very simple in construction and Is 1 made cr ot only such materials mator lala ae as are eardly obtained the working principle rIn ciple of an electric boll bell Is thie this when the push button la to tho the curment from tho the bell bat lery tery passes along tho the bell wire ire ind and through colla coils of wire mounted upon the boll bell baen base these colls coils of wire aro are wound around cores of soft iron and when tho the current passes around and around through tho the many turns of wim the cores become magnetized and together form a horseshoe horse shoe magnot thie this magnet draws tho the boll bell hammer arm or armature towards it then tho instant tha thu the armature turo Is pulled away from tho the little ad just mont screw that presses against it tho the electrical connection Is broken tho the horseshoe horse shoe shoo magnet loses its magnetic influence and tho the nr armature maturo springs back to its former position against tho the adjustment screw ahls closes tho the circuit then tho the current flows through tho the magnet colls coils again and tho the armature ie to drawn away from tho the screw as before tho the horseshoe horse shoe shoo magnet Is tho the farst portion of tho the bell to mako make got two tuo inch or 5 carriage carr logo bolts avi 2 inches long for the iron cores and va pound of ordinary insulated bell wire also buy four inch bolt washers for the ends of tho the magnet magnets slip blip two washers upon each bolt and the nut onto tho the end tempo warily before fit at arting to wind the wiro wire upon tho the bolts slip tour four or five inches of tho the end through the hole of the Na washer slier on tho the nut end of the bolt then carefully wind ind tho the wiro wire around tho the bolt between that washer and tho the tab on tho the opposite end ne as shown fold t th UM sides of the piece over onto thu middle portion fig 8 and thon then fold tho the sides of tho the hammer end over tho the hammer wiro wire and pound it down doan until it holds tho the wiro wire securely punch a hole through the opposite end of the armature large enough for a small screw and screw it nt at this point to a small block of wood A fig 8 then fasten block A to tho the base block in the position shown in pig fig 2 with tho armature exactly parallel to tho the magnet heads and about 3 16 inch away anay from them pig fig 9 shows the details of tho the ad 1 screw and a binding post cut D out of hard wood tack tho the strip of tin D to its top and face and nail D B to tho the base block near the i piloted en ent of the armature as shown shoun in fig 2 tack the piece of tin C to the base block under tho the end of D and punch a hole through both C and D for the screw eyo eye binding post to run through fold a small piece of tin in half as na shown in pig fig 10 for tho the second binding post tack the lower louer por tion to tho the base block and pierce a hole for a screw sere oyo eye this bandin post may bo be far toned almost any an rib rl on u 11 the block connect one of the upper tipper ends of the magnet coll coil wire to it and connect tho the upper enil end of the other coll coil wire to the screw which holds tho the armature to block A mount the bell from front a broken alarm clock upon a tin stilt made as shown in rig 11 using a long enola enough screw to extend well ell into the b bise tse block the armature roust must not strike the bolt heads because just enough magny magne tiara Is likely to remain in them aftel the electrical contact has been broken to hold the armature fast place the bell in auch such a position that the ham mer iner end of the armature cannot be IRE r FIG fa G 4 mih Z FIG Z 11 FIG 5 M C FIG 2 atan OF dall MAGNET RUC R TACK lalard ALA 1 1 k 55 V ST KER f WAX do oft SOLDER FIG 7 A HOE SHOE POLISH CAM CAN pi FIG c 12 o 0 eul aron FIG fic 6 8 5 screw 1 ALARM CLOCK lt vy TIN r 1 stilt T L okd ft G 13 FIG it FIG 10 it fic 14 1 MG 9 4 C az one at thu bolt bead cud end wind back to the starting point then to tho the bolt head end again and so on back and forth until the height of tho the washers has been reached wind an even number ot of layers on the bolts so the end of tho the wire ire can bo be brought out lu borgh the washer at the nut end fig 3 shows the core wah ith the coll coil completed if you now connect both ends of the coll coil wire to a battery as a test ou will vill and find that the bolt has become an electro magnet the two electromagnets electro magnets connected at one end with a metal yoke form tho the horseshoe horse shoe magnet one end of a horseshoe horse shoe shoo magnat attracts and the other repels and in order to wal gibke ke one a positive and the other a negative pole the winding In ding of the colls coils must be done in opposite directions that Is the winding vinding on one must bo be done clockwise and that on the other counter clocks ise muke make tho yoke out of a strip ot of tin I 1 inch wide u ide and 3 inches long and with a nail punch holes through it 2 inches on centi centers ors large enough for the magnet bolts to stick through fig 4 connect the lower ends of the wire of the two tuo colls coils together then screw down doan the nuts tight against the yokes figa figs G and 6 show how the horse horseshoe shoe magnet Is fastened to the bell base by a wooden cleat of the armr turo are shown in figs 7 and 9 it jt Is made of tin cut from a tomato can und the ham me mer r from a broken alarm clock cut the piece of tin 5 inches long and 1 aa 4 inches wide over all with a 1 I inch ab on the hammer end and a L tieh drawn closer than 1 16 inch to th bull bult ead A splendid homemade home homo made push buttor can bo be made with a shoe polish car fig 12 cut a block inch thick and of the inside diameter ot of the can and to it screw the tin contact plate E and F figs 13 and 14 use a brass rug tack for a button file ot its end and short and drop enough seal ing wax nax or solder on the remaining end to keep the tack from slipping oui out out of the hole you can operate your bell with r homemade home made battery battory Us a mason fruit jar to hold the solution and a zinc pencil and a carbon fron a worn orn out dry battery for the zinc and carbon elements after connecting the battery push button and bell you will have to ad just the contact arrew to the point af at which the armature vibrates th steadiest and strongest copyright by A neely hall |