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Show AN OPEN CIRCUIT TELEGRAPH Olagram Giving Connections for Home Communication That Will Not Waste the Battery. Being a young student of electricity myself I know the great desire which boys havo to construct telegraphs between be-tween their homes, so I will describe Tor their benefit nn open circuit equipment, equip-ment, becnuso the closed circuit Is entirely en-tirely too expensive for this purposo, nyB Percy J. Friday In Popular Me-chnnics. Me-chnnics. All the Instruments needed nt each end of tho lino nro a regular sounder '7 zz Battery Switch tTVJ, L I Trh.UtoJ LUL: 1 TrHtter J tj,,l Batteriea 4-fcj ' I I I Sounder Connection for Open Circuit Telegraph. a regular transmitter, a two-point switch nnd a set of batteries. It will bo noticed that this plan Is exactly tho same oh tho ordinary telegraph tele-graph except that a wlro (A) (seo diagram) lias been added so that tho current can bo sent through tho sounder at one end without going through tho battery and key. When not in uso both switches nro turned to connect through tho (A) wires. When so connected thero is no circuit through either set of batteries. Tho person who wishes to call simply moves his switch so thnt It connects through tho bnttery nnd key, then he T" " !-! I I.IIW -. , ,.- ,.,-. , - IIIIIM.II Is rondy to cnll nnd does bo in the usual manner. To answer the call tho other person also changes his switch. T Then they may send messages in the "".. ff usual manner. When through, both ( . persons change tholr switches again v " , and tho circuit is opon, but either person per-son enn cnll. A GIRL SHOULD LEARN To bow. To cook. To mend. To bo gentle. To vnlue time. To dross neatly. To keep a secret. To avoid Idleness. To be self-reliant. To dnrn stockings. To respect old ago. To moke good bread. To control her tempor. To take care of the sick. To sweep down cobwebs. To marry a man for his worth. To road tho very best of books. To bo a helpmeet to her husband. To take plenty of active exercise. To keep clear or trashy literature. To be light-hearted and fleet-footed. |