| Show OW TTO TO MAKE A SOUND intensifier A L E 0 R M F X ambled mb led intensifier showing parts can be made from discarded re a an of automobile light I 1 la Is 8 said la to make u use so pac packer er ine rhe rork y part of a hag ex capt the squeal bevery some of the he the cu ra in alb tall d of the in make kc use experimenters dl ho peal st following describes a useful she S forthe for the radio ama i ce of 8 apparatus ratus constructed tit it n R low cost all r material al can be readily procured practically nothing at some mo motor tor gage 1 kurlenda jt a friends gara garage go and in tile tho junk discovered a discarded front V i was ht it reflector from an automobile an alum aluminum fatum from it n token rubber robber bulb from n motor horn id some gome motorcycle spokes with nips attached these were obtained and brought home a e of cost ithe he first procedure was to clean off 1 grease from tile the reflector the hat flat at the broad end of the reflector 1 is 3 next cut olt and tile the surface mada looth this left the two beads on the ge as the finish the hole in the cen of the reflector through which the det of the lamp passed had a small t disk of copper soldered in the re olag SOURED CN 0 ar au FOR R SPOKE transforming the reflector actor was next polished inside and slier r plated and the outside was enam led ed black pour four holes were drilled t through the reflector edge to ito which holes the spokes fitted this dished the reflector see diagram no the was apart pd t d the aluminum shell cleaned and fen the lug was cut ona the was dext ext removed and the hole from which 1 was taken was countersunk inside nd d outside and in this hole a plug of oft aluminum was fitted and riveted ver so as to fill up the hole all rough ess em both outside w and inside was re oyed with a file and scraper A block f wood was then turned on the lathe 0 fit into the broad end of com comsuta muta 4 or r casing the outside of the comma antor ator wao turned smooth and 6 n hole ored bored in the end of the cone this was amed arned out leaving a thin tube project ing ng four equidistant holes were bored borea tear the broad end of the cone on the oat flat surface of the om into alch the spoke nipples fitted and yere ere countersunk on the inside to suit the he heads of tile the spoke nipples and these were filed flat so that when in place the surface inside the com muta i bior shell would be smooth four equidistant holes were were bored one quarter of n inch from the flat edge of the shell 6 40 to take four small screws and countersunk Jer on the outside the rhe nipples were removed from the bold old spokes and were cleaned and pol poi ached isnec the spokes were cut off exactly A 2 ih inches long from tile the threaded end 18 a small washer was fitted on the other end ena and the end of spoke riveted over 0 o the two sweated together neatly they ney were then copper plated and ellered like the reflector four spokes L were we required see bagram no 8 next ht a strip of stout sheet brass was waa cut Us is shown and holes were bo bored for ewe A large hole bole was made to take allej A A 47 w J I 1 it the ot of the fleeter reflector to which vas soldered 0 when assembled see magrann am no 4 tho old 0 hor 1101 n bulb th was cleaned well to the a and was left t ready to cut appa proper 01 length en ni when hen the complete lee waa s re ady y to assemble caratu graec no 5 for sketch of ap 10 tite ite the hn when Q as ambled the lettl letters erfia afi various parts A screws holding wooden block and shell together B nipples of spokes holding shell central with reflector nector re 0 spokes passing through reflector and shell D earpiece Earple ce of telephone receiver E of rubber bulb as sound deflector conveyor to reflector P F shell G wooden block fitted into corn com shell in which telephone Is fitted H adjusting screw to press receiver beiver against rubber washer M J holes for waves from telephone receiver K holding down clip for front of reflector L Z brass standard screwed to base and soldered to reflector nector re 11 clubber ring made from liner amner tube of motor tire the arrangement for using tile old aluminum shell for holding the telephone receiver con can also be applied in a different manner if the wooden block Is turned flat it could bo be screwed to the top of the radio cabinet and a large horn fitted on the small end of the shell as amplifier if a number of holes were drilled in the side of the cone find and the holes tapped to take inch brass pipe it could then be fitted with rubber tubes which could bo be fitted with ear P pieces feces leces of glass tubing and used by a number 0 persons part of the brass knob taken from a bed or a door could be used instead of rubber procure a telephone receiver the dl di arneter of the cover of which Is less than that of the inside of a shell which la Is two and thirteen sixteenths inches the depth from tho the face of the earpiece earple ce to tho the back of the telephone does not matter much as a wooden case must now be made to fit inside of the shell in this wooden case part Is turned 01 out to hold the rest of the receiver A rubber ring is put inside tho the shell and the earpiece earple ce rests against it the wooden case Is then put in place and with the shell it Is held firmly by four screws an adjusting screw at the end of the wooden case presses tho the earpiece earple earp lyce ce tightly against the rubber ring and an airtight the connections can be brought out through the wooden case of flexible cable or otherwise to suit the maker diagrams of each part are shown as well as of the assembled instrument when all parts tire ore ready proceed to asi assemble emble as follows take shell reflector and four spokes pass a spoke from tho the outside of the reflector into a hole in the shell and screw on the nipple do the same with the other spokes the shell Is then held in the center of the reflector with the narrow end pointing towards the polished face of the reflector tighten up the nipples evenly until the shell Is rigid with no or shake the piece of rubber horn hom bulb Is cut so iso that there Is a space between it and the face of the reflector when slipped over the end of the shell opening the brass strip Is slipped on the outside and fastened to a neat wooden base the edge of the reflector rests on the wooden base and la Is held down tight by a sere screw yr and clip when the reflector Is fixed filed on the base the brass strip can be soldered to the back of the reflector when the telephones are inserted the block placed in position screwed tight and the back adjusting screw tightened up all la then complete to connect up to tho the set IQ g science and anven invention tion and radio nw news |
