Show says habits of mind to be changed by radio radio Is going to change the mind of man declares sir philip Gibbs tha british writer who bel eves that ra dlo is going to give nun a ocr life beyond previous dreams here again the scientists have presented new opportunities to humanity bill surely alter their scheme 0 life their habits of mind their social customs ard almost as much as alie alteration of material conditions which are now awaiting them he writes in cosmopolitan again we stana only on the thresh old of a new age and ct already we ore conscious of newly revealed won ders which in the old dais would have been thought and are in deed tal ing us into a region beyond mere matter in the sanctuaries of eternal force radio has opened up new vistas of knowledge according to sir philip and has given to people wide sympathies in afe ond put them into touch with other countries and minds perhaps those are high words to use about in invention which iq called or radio he adds so corn mon now after a few years of use that most of us have a wireless aerial over our chimney pots ore must not underrate the effect even now on the human mind caused by this broad casting habit which has taken hold of life one may onla hope that it will be less vulgarized by some of its transmitters we are still at the beginning of this new knowledge marconi s beam system of telephony Is already its experimental stage it Is now possible to focus the ordinary wireless upon a locality with such directress tint when sent from angland to canidi or aus they amy be received only over an area of e fifty square miles the world will become one dersal telephone exchange with mil lions of conversations crossing each other through space in every diorec alon waves not walts give range amateurs finda when a broadcast station wants to increase its range it increases ity power when an short wave operator wants to increase the range of ills station he changes wave length and does not increase power at all several years ago when short waves were first being dinv inv estl gated the ama beur found out that increases or decreases of the power of his transmit ter meant very little but tint the par wave length used meant much an 80 meter wave for instance vai found good for ranges of 50 to 1 TOO miles at night more or loss of the power vad and a 40 meter wave for distances of 1500 to miles consequently if an cast coast ami beur using a low power transmitter on SO meters for communicating with sta alons in the midwest wishes to corn instead with the P coast or europe or australia he doea not put in a larger transmitter but changes to 40 meters confident that hla low power set will be just as effective over the long distance on 40 meters as it was at the shorter als on 80 for extreme distances nt night and moderate long distance w ork in daylight 20 meters Is used method of pepping up veteran radio tubes A simple and method of re tubes which have gone dead Is to turn their filaments up to normal brilliancy and then to reverse the polarity of the B battery connecting its positive terminal to A end its negative to the lead which Is normally connected to fhe B the tubes should be left connected in this manner for a full hour the filament current should then be turned down to the lowest point and left ahk wa for another half hour in cases where the tubes are un usually poor the treatment may have to be repeated after the tubes have been allowed to cool off the batteries should be t connected in their correct manner it should be borne in mind that some types of tubes are not suit able tor rejuvenation such are ali and certain power tubes ru dlo news Is annual cost of watt station statistics of the service bureau of the national association of show that a sum of was necessary to operate a representative watt station last year the engineering department con 25 per cent of the alon with an expenditure of the same amount was spent under the item of general overhead this in eluded taxes insurance rent depreciation and other charges the program department was the biggest single item with an expenditure of ai COO or 35 per cent of the total aulce supplies and c th commercial while 2700 went tard the publicity department |