Show test buzzer for crystal detector set those have crystal detectors when baij asking the alie usual question buc ilow how aran I 1 best improve my set are usually immediately told to get a vacuum tube detector outfit tills this Is in out of 0 the hie question for many of the crystal tet bet owners since once a six volt battery in the neighborhood of 20 and 4 so r end 0 the price of 0 the unassembled parts comes to at least 30 la in order to get tile the best possible point on castal it Is absolutely necessary to use a test buzzer any buzzer or bell which depends on battery current for operation will do although the higher pitched buzzerd buzzers sold old tor for radio work rhe ghe a much botter bother and evener tone the dry cells a little wire and a push button or switch for starting and stopping the buzzer tire are the other things necessary in order that the buzzer may be heard only in the head get et it to Is necessary that it be muffled in some way this can be dune dione by locating it in the next nest room or bits or by wrapping it in a cloth and placing it in a box run nun the two wires to the buzzer from the push button located on the table connect the t two dry cells in a et ab ull AL i bu ul llie 1 LIU uld test est buza buerer r Is ready for a cital to adjust gi the detector close ae the run tact through sli the push button aution or switch flech tills this will mill start the crystal now try barlous spots on the cry tal with the end of the cat walser er or wire ire spring until the buzzer can bo heard lu in the phone if the buzzer cannot be beard at all after a search it may bo be necessary to connect one side of the buzzer line to tile the ground learl lead on the set do not be satIs satisfied fled with just hearing bearing tile the buzzer there are many poor spots on oa a crystal but only a few really good ones and it Is surprising how sensitive a crystal can be when tile very best adjustment is made A good piece or of galena gabena Is our preference this crystal requires a very fine clean point with light pressure therefore galena it if it Is to be used a very light spring contact wire Is necessary the end of the wire mire which touches the crystal can be cut with a knife or pliers at an angle so that tha point Is sharp 0 the big advantage of the test buzzer over tile the outside signals la Is that it la Is always available and Is constant lu ILI strength |