Show wt rl Ili rI r Ir toll f I II I Diagram Showing How to Construct Simple Crystal Set That Gives Results The he r celver about to bed be described cnn can be constructed with very wry little ex- ex expense expense ex expense pense The Pie panel Is n piece of inch half halt wood hard rubber or bakelite The Is made of wood The lInnel panel can be any size We su suggest gest seven seyen Inches by hy nine Inches Indies as ns a convenIent one Tho Is attached to the panel liy by h means menns of No C 0 wood screws one Inch long Tile The coil coll Is wound on a cardboard tube four Inches In diameter and four Inches long Get quarter one pound of 22 2 d c c magnet wire The Winding Start the winding and wind on One turn Make Slake a loop In the wire wire-n wire loop about one Inch then long long then wind windon windon windi on another turn and make another loop the same length Continue wind wind- wind 1 Ing Ins on single turns and taking out loops until ten turns have been wound After this wind on ten turns make n a loop wind on ten turns more make another loop and repeat the process Continue until a n total of CO 00 turns turn have been wound on the tuh tube lube Solder leads to the switch points lon long enough h to reach from the left hand switch to the units taps Also solder leads lends to switch points of the rl right right hand hand switch to reach rench the tens lens taps In rotation solder thes tiles these leads to the ends of the loops after fler scraping the Insulation end of the loop loo Ready to Tune In Connect the aerial to the post on onlie the left and the ground to the post on the right at the top of the panel Set the fine wire of the detector on the cr crystal stal and turn the tens teus switch untIl a n station Is heard To tune tunc In lu better hetter after the station Is heard turn the units switch This switch gives gh-es the necessary fine ine tuning The most difficult operation In using this set fet Is to find a sensitive point on the crystal After this point Is found It Is merely necessary to vary the two switches to tune In different stations Cleveland News |