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action actual adjustment alternate currents apparatus armature arrangement battery Bell instrument brass cable capacity carbon cause cell circuit condenser conductor connected copper sulphate copper wire creosoted current flowing current passing current sent Daniell cell deflection depressed diameter direction disc disconnected distance duplex earth earth-wire ebonite effect electricity electro-magnet electro-motive force employed equal fault fixed galvanometer gutta-percha inches indicator induced inserted instrument insulation resistance iron wire joined joint leakage length lever line current line wire loop magnet means metallic mile milliamperes motion move needle Office ohms operator ordinary piece placed polarised pole porous position potential practically ratchet-wheel receiving relay resistance coils reverse rheostat screw segments sending shown in fig side signals soft iron sounder speed spring strength switch switchspring tangent galvanometer telegraph telephone terminal tion total resistance transmitter varies vibrations Wheatstone Bridge words per minute zinc plate zinc sulphate
Page 443 - RAILWAY APPLIANCES. A Description of Details of Railway Construction subsequent to the completion of Earthworks and Structures, including a short Notice of Railway Rolling Stock.
Page 444 - INTRODUCTION to the STUDY of CHEMICAL PHILOSOPHY; the PRINCIPLES of THEORETICAL and SYSTEMATICAL CHEMISTRY.
Page 443 - Price 3s. 6d. On the STRENGTH of MATERIALS and STRUCTURES : the Strength of Materials as depending on their quality and as ascertained by Testing Apparatus : the Strength of Structures, as depending on their form and arrangement, and on the materials of which they are composed. By Sir J. ANDERSON, CE &c.
Page 285 - The twist-test will be made as follows: The wire will be gripped by two vises, one of which will be made to revolve at a speed not exceeding one revolution per second. The twists thus given to the wire will be reckoned by means of an ink mark which forms a spiral on the wire during torsion, the full number of twists to be visible between the vises.
Page 131 - ... necessarily adheres to them. Rain, fog, dew, and mist affect it. Lines exposed to the spray of the sea or the smoke of manufactories are peculiarly liable to this variation. Other causes also introduce irregularities which interfere with the constancy of a line. The wires are continually subject to accidents of various kinds, many of which tend to produce variable resistance. Now what effect has this variation of the resistance of the line-wire upon duplex working, and how is it provided for?...
Page 443 - PHYSICAL OPTICS. By RT GLAZEBROOK, MA FRS Fellow and Lecturer of Trin. Coll. Demonstrator of Physics at the Cavendish Laboratory, Cambridge. With 183 Woodcuts of Apparatus, &c.
Page 443 - The ART of ELECTRO-METALLURGY, including all known Processes of Electro-Deposition. By G. GORE, LL.DFRS With 56 Woodcuts.
Page 444 - Tools, Lathes, Drilling, Planing, and other Machine Tools used by Engineers. By CPB SHELLEY, MICE With 292 Woodcuts.
Page 149 - ... and regularity of a suitably arranged machine, not only can we attain, but far exceed, the highest speed of the ordinary Morse or sounder. Hence early efforts were made to replace the hand-worked key by some mechanical contrivance which would not only remove the defects inherent to manual labour, but would secure precision in the formation of the characters, accuracy in the despatch of messages, and speed in transmission. Bain in the year 1846 was the first to propose this. He punched broad dots...