| Show AN ax ELECTRIC SAFETY leck LOCK MM duve and Le lemaire malre two young me in paris have invented a new kind of safety lock the key opens the lock without ringing the beile bells but if a false key be a jimmy or any piece of metal the bells are set going as long as the piece is applied this is effected by toe the dis disposal I 1 of the thes several everal tumblers with regard tro Too to a small lever which completes the battery circuit when elevated when all the tumblers are lifted simultaneously as by the master key the lever Is not rals rais balsi ed and no alarm is given butof but if one or two or three be lifted the alarm lever Is raised ringing takes place if th the burglar knowing the mechanism of the ekl oky loek lock try to force the lock plate by any of the usual burglars in strutie ants as soon as the metal Is attempted to be wedged in the ringing commences com mances the safety lock can bead be applied to all doors or fastenings without distinction the acting agent of alarm is a feeble current of electric electricity it produced by a small battery of two ze elements the pile used is that of 0 le clanche small model with peroxide of manganese and a single liquid which does not require touching for several months and then even a little water is all that is necessary to replace that lost by evaporation the master key is protected by an insulating substance so that when introduced 4 it t establishes no contact nor does it raise the alarm lever when the tumblers are lifted now supposing a burglar to have a dozen or so isolated keys he could introduce any one of them silently eilent ly but on his attempting to kurult turn it the wards not being those of the master key the alarm would be continuously given and put an end to his experiments so that he could not try one key after another journal of the telegraph |
