Show 0 w on r 0 0 buell BUt ll by Q dourlas editor ot of na I 1 merchandising today in la almost any magazine you chance to pick up it Is possible to find and the adae advertisements of junior receivers ot acme kind most of these ore are nothing ingemore In glmore more than a tuning coil coll and detector mounted in some kind hind ot of box or va cabinet binet these are easily made and are quite efficient on an short waves for some distances distance that Is the reason I 1 ara am describing scribing the junior receiving set not I 1 constructed ted of material taken from old 0 D H ft A 6 S v 11 00 1 B 0 00 SOO yaa 0 Q I 1 15 S W 9 ir I 1 V this thia crystal receiver ne celver provides provide sharp tuning thanks thank to the tha variable con denser apparatus yours may be of old material or of material bought for the purpose to begin with a cabinet Is constructed to the inside dimensions of 6 by a inches by 0 inches in depth the material used I 1 la Is birch one quarter inch thick it Is put together with small screws and glue when ahen the glue has sot set it Is stained a maho mahogany kany color and varnished this coat Is allowed to sefor set for three days and Is then rubbed down with pumice and water wafer and varnished again it if this to Is done carefully you will have ilive a cabinet closely resembling a factory product the front panel Is of bakelite or formica one quarter inch thick and cut 6 6 indies inches wide and 9 0 inches long before drilli drilling Ag a template of the front panel Is made of heavy paper and the location of the inspru instruments ments Is fig figured Aired out and marked on thas so as to A 6 wiring diagram of the set the two binding posts post at the bottom are for the telephones telephone duce the chances chances of mis mistakes takesi the template Is then laid over the panel and the transferring Is done with some sharp pointed tool the the holes for the panel mounting screws the switches and switch points variable condenser and detector la Is accomplished with some small sharp drill the tuning gall coll Is no 24 enameling enamel in sulfated eulater magnet wire wound on a tube 6 inches long and 3 inches in diameter the winding Is tapped capped it at 20 equal spaces tho switch levers switch beltch stops stop and switch points poInt sare are put on the front panel and the taps are connected to the switch points and the cou oil Is mounted behind the panel with wooden brackets as shown in fig 4 this ibis completes the tuning coll call and controlling switches the variable condenser Is or can cad be any standard condenser having a capacity of about mf m f mine was was a murdock panel type hail having ngat tAt capacity the condenser Is mounted back of the panel and the indicating dial Is screwed onto the shaft the detector can be of any good reliable crystale cryst alj hij type preferably that called galena it may be either an old one or it may be purchased for this purpose it Is taken from jag to base und and mounted at the top of the front panel A small fixed condenser having a capacity of about mf m t ii 19 used for the phone or stopp stopping condenser ond eriser this Is screwed to the bottom of the calit iff aw ep raa rati ol if hgr fg 1 construction detail of the tha R Ht mcelver ec celver elver the cil Is if maintained against the pa panel ne I 1 by means mean of a clock block of wood and screws screw ret bet and Is I 1 cuned to shunt across the ph phones onis ahli comrie competed ted makes the r pat ready for work on wiring after the binding posts posto tire ara put pui la in splice place as on the ta drawing of the abe front wl liun han u wire itom from the switch level on your left to the binding post at the upper left and mark this A the other to in connected to thi the other binding post and marked 0 A wire Is run from the left side of the tuning coll call winding to one of the th Tar variable lable condenser terminals then to ona binding post on an the detector from the other detector binding post a wire la Is run to the phone condenser and then to the phone binding post on the left another wire la Is run from the other variable condenser binding post to the right hand end of the tuning coil winding to the phone condenser and then the other phone binding post the set Is now completely wired and the cabinet coin can bo be closed and seated sealed as shown in fig 3 for use the aerial la Is connected to the binding post marked A and the ground to G the phones are connoted to the binding posts on the bottom of the panel most of the tuning Is accomplished through tho the switches while the variable condenser Is used mainly to tune out interference |