Show way to avoid burning out valuable tubes A french amateur otters offers to his brothers a little trick by which they con can avoid burning out the lie filaments of 0 the he precious tubes so quickly it la is something like a trick which reg neg maud had use find and described in some in the english Engl lih papers lit in changing the mounting of a set it often happens that n false move cpus causes ei the 00 06 volt circuit to come coine in r 1 7 A t tho the simple arrangement contact with the filament circuit in in which case the ilie tubes are promptly burned out to avoid this take an electric extension plug of the type chich has bad two small brass posts on it js ja Is used in france with a file make these two little plugs the elze of the lie base ase plugs of an hudlon and the same dis distance apart make blake a little kettil pluite one side of which la Is to br ba held under the setscrew of the contact post the lie other being bent ap up and fastened to the he socket of a pocket flashlight bull insert the ho bulb a 3 or evolt 4 vot one the second contact of its base being lilace diorec aly on the upper part of the second plug this simple arrangement la hi illustrated herewith when an amateur has hooked up ills his set and fit fore he inserts his tubes he can take this instrument attal a il place it in each tube socket 11 turn it the little bulb burns brightly the circuit Is 18 till nil right but if ve e bulb burns burn out it if Is necessary to tk readjust hla his aring thus saving money in spoiled tubes |