A Hand-book of the Electromagnetic Telegraph

23 Murray 25 cents 27 Warren Streets 50 cents adjusted armature binding posts break BRIDGES called carbon battery cells of battery closing the circuit cloth coils conducting power conductor Copies sent free cuit current of electricity cut-out Daniell Battery dots and dashes edition Electric Telegraph electro-magnet electro-motive force Engineer engravings escape Exercise free by mail Galvanic Galvanometer ground wire Grove battery hard rubber independent circuits instrument insulator lever lightning arrester line wire mail on receipt main circuit ments Messrs metals Morse Murray and 27 nected NOSTRAND'S PUBLICATIONS number of cells OHM'S LAW Ohms Paper covers pass plates platinum points PLYMPTON porous cup Prof put in circuit receipt of price relay magnet Repeater resistance rheostat set screw short lines shown in Fig sistance soft iron solution sounder station sulphate of copper sulphuric acid telegraph circuit telegraph line TELEPHONIC RESEARCHES Terminal Station tery tion tumbler wood-cuts Yale College zinc