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Show AUTOMOBILE-ThIeF ALARM IS EFFICIENT AWlS tfu't DIFFICULT OF INSTALLATION r Au the Thief Takes HI Seat at the Steering yheel, He Seta Going an t . - Invisible Alarm Dell, Which Continues to Ring Until Switched Off by a Concealed Switch in Another Part of the Car. 8 Many good nnd cfllclcnt automobile locks hnve been called Into exlsfenco by the epfdcmlc of automobile thefts, Ud there is now no excuse for leav tag a car unprotected. The locks In jt general uso are of several classes, m . cacli presenting Its own ndvantnpes and open to its own objections. Elec- v trlcal locks for merely breaking the Urnltlon circuit were the llrst on the " utfiqe, and are still used to some ex- I tet, although no expert automobllu I thief would be delayed by them for fj woe than n few seconds, as ho would i simply connect around the "lock" with I a wire leading directly from the bat' I cry to the Igniter. f! Complicated Locks, n Cta.iollne-llnc locks aro useful, ' but , i sonicvrliat complicated In their In I Btallntlon, and Introduce the question- I ftftlc element of additional opportun- I . lf for gasoline leakage. Probably M tie favorlto method Is a purely ntc- m ohnnlcnl lock, on the steering gear, the in starting craulr, or some other e.ssen- tlnl part of the mcchnnlsm. w While all of these locks may be re- H lied upon to prcTout or at least delay re considerably the work of the thief, Wj -Pu 7rmrcncs 1Z . T switch m ?'VWWBjpijgiAti. S mtiihy ,.&. 1.1 K )r 1 j rWTWIH OXCOT OH 0-OUH T" "'eta? ij Various Parts of Circuit. .$ feir, if any, of them arc of any assist- n art to the police In capturing the Sj wpaU-b thief. The device hero do- &j 8fbed la Intouded to accomplish this - H purpose, and at the Mime time furnish ft a protect Ito device with all the con- m yealenct of the Ignition lock. Arrangement of Circuit. 8 Tho efftct of the contrivance Is that, 1 wfcen a thief enters the car and takes S felt place In U10 driver's scat, an In- I viaHvu intni bell under the car starts ringing, and continue to ring even nfter the thief leaves his fcoat and eecks safety from the police or citizens citi-zens who are sure to be attracted by the noise of the bell. The bell will continue to ring until tho owner returns re-turns to the car, or until somebody Minis the hidden control switch and turns It off. Of course, If the thief Is Ingenious enough to find this switch at once, he can turn off the alarm himself, him-self, but there Is small chance of a thief working very long around a car to the accompaniment of a loudly claliglng belt. ' Diagram Explains. , Tl'e various parts of tho circuit and their connection are shown In tho din-cram. din-cram. Tho materials needed aro : One or mere smnll switches to bo concealed con-cealed as well as posslblo within reach of the driver; n good, loud electric elec-tric bell ; a relay, or circuit breaker, such as Is used on nearly all modern automobiles to connect tho generator to the battery when tho proper speed Is reached; somo roslstnnco wire, large enough to carry several amperes of current and some pieces of wood and spring brass to make the scat switch. As will be noted In the circuit cir-cuit diagram when tho concealed switch Is closed nnd the seat switch Is closed, the circuit through the bell Is established, and, at the same time, tho circuit through tho circuit-breaker switch, so Unit, even though the latter Is open, tho bell continues to ring. The resistance coll would not be necessnry If the circuit through the bell was continuous. Since, however, how-ever, It Is Interrupted at eacn tap of the bell, the coll Is necessary In order to maintain n sufllclent current through the circuit breaker to keep It from permitting the shunt circuit across the scat switch to open, thus stopping the alarm. The only way the alarm can be stopped Is by breaking the main circuit, either at the concealed con-cealed switch or at some other point. If properly wired this cannot be dona by a stranger without spending considerable con-siderable time, which, under tho circumstances, cir-cumstances, is out of the question for a thief, at least In a city or town. ' Popular Mechanics Magazine. |
