A

• Accumulated, 31.
• Accumulation, 29.
• Accumulator cell, 87.
• Accumulators, 82, 88, 89.
• Accumulators, plates, 83.
• Acid, 34, 37, 125.
• Acid maker, 125.
• Acid, sulphuric, 31, 84.
• Acidulated, 55.
• Acidulated water, 34.
• Acoustics, 110.
• Actinic rays, 184, 185.
• Actinium, 186.
• Active element, 82.
• Adjustable rod, 107.
• Adjusting screw, 70, 71, 72, 73, 106.
• Aerial wire, 108.
• Agents, 13, 32.
• Alarms, burglar, 11, 76, 80.
• Alkali, 125.
• Alkaline, 37.
• Alternate, 127.
• Alternating, 38, 149, 150, 153, 154, 155, 156.
• Alternating current, 145.

• Alternating periods, 149.
• Alternations, 147.
• Aluminum, 128, 129, 135, 137.
• Aluminum hydrate, 129.
• Amber, 5, 171.
• Ammeter, 7, 88.
• Amperage, 38, 61, 62, 132, 159, 160, 168.
• Ampere, 7, 37, 60, 63, 139, 140, 167.
• Amplitude, 111.
• Annunciator, 65, 74, 76, 79, 80, 81.
• Annunciator bells, 11.
• Anode, 35, 133, 134.
• Antennæ, 108.
• Antimony 137, 143.
• Anvil, 13, 14.
• Apparatus, 11, 57, 106, 139, 145.
• Arc, 163, 182.
• Arc lighting, 38, 165.
• Arc system, 166.
• Armature, 18, 25, 38, 40, 42, 43, 45, 46, 47, 48, 53, 55, 70, 72, 73, 74, 90, 93, 112, 151, 152, 155, 163, 176, 177, 178, 179, 180.

• Armature brush, 48.
• Armature post, 71.
• Armature, vertical, 75.
• Armature winding, 42, 43, 156.
• Asbestos, 140.
• Astatic galvanometer, 108.
• Atmosphere, 184.
• Attract, 30.
• Attracted, 72.
• Attraction, 21, 25.
• Attractive, 178.
• Automatic, 120.
• Auxiliary, 44.
• Awls, 14.

B

• Bacteria, 126, 187.
• Bar, cross, 66.
• Bar, horizontal, 46.
• Bar, parallel switch, 67.
• Bar, switch, 65, 68.
• Base block, 66.
• Batteries, 11, 93, 122.
• Battery, 29, 30, 32, 35, 36, 46, 47, 80, 81, 82, 83, 85, 86, 88, 92, 94, 95, 107, 108, 116, 117, 118, 121, 134, 142.
• Battery charging, 82.

• Bearings, 45, 46.
• Bells, 65, 73, 76, 122.
• Bells, electric, 70.
• Bench, 13, 15, 17.
• Binding post, 52, 70, 71, 72, 103, 107, 108, 121.
• Binding screw, 65, 66.
• Bismuth, 18, 143.
• Bit, 13.
• Blue vitriol, 57.
• Brass plate, 77, 78.
• Brazing, 17, 65.
• Bridge, 52.
• Brush holder, 46.
• Brushes, 48, 150, 151, 153, 167.
• Burglar, 11.
• Burglar alarm, 76, 80.
• Buttons, contact, 80.
• Buttons, push, 65, 68, 69, 70, 76, 79.

C

• Calorimeter, 56.
• Cancerous, 187.
• Candle power, 89, 139.
• Cap, removable, 73.
• Cap screws, 42.
• Carbon, 35, 119, 121, 162, 163, 169.
• Carbon block, 120.

• Carbon pencil, 119.
• Cathode, 35, 36, 133, 134.
• Cell, 29, 33.
• Cell, accumulator, 87.
• Cell, charging, 87.
• Channel, 43.
• Channel, concave, 40.
• Charged, 120.
• Charged battery, 82.
• Charging circuit, 82, 89.
• Charging source, 83.
• Charged wire, 147.
• Chemical, 57.
• Chisels, 13.
• Chloride of lime, 84.
• Choked, 157.
• Choking coils, 145, 146, 156, 158.
• Circuit, 33, 69, 73, 76, 78, 80, 81, 90, 92, 93, 109, 113, 116, 121, 122, 131, 134, 143, 156.
• Circuit, primary, 99.
• Circuit, secondary, 99.
• Circuiting, 81, 155.
• Circuiting system, 79.
• Clapper arm, 70.
• Closed rings, 26.
• Coherer, 105, 108, 109.
• Cohering, 106.
• Coils, 18, 26, 52, 55, 74, 160.
• Coils, choking, 145, 146, 156, 158.

• Coils, induction, 99, 102.
• Coils, primary, 109.
• Coils, secondary, 102, 109.
• Coincide, 42.
• Cold, 14.
• Collecting surfaces, 30.
• Collector, 31.
• Column, 61.
• Combustion, 169.
• Commutator, 44, 46, 151, 152.
• Commutator brushes, 46.
• Commutator plates, 45.
• Compass, 22, 24, 172.
• Composition, 83, 124.
• Compound wound, 47.
• Concave channel, 40.
• Condenser, 98, 100, 101, 102, 108.
• Conduct, 6, 108.
• Conduction, 135, 136, 138, 166, 170.
• Conduction current, 27.
• Conductor, 21, 31, 33, 63, 98, 116, 161, 162.
• Conduit, 72.
• Conically formed, 126.
• Conjunction, 143.
• Connecting wire, 58.
• Connection, 72, 76.
• Construction, magnet, 39.
• Consumption, 180.

• Contact, 122, 123, 152, 162.
• Contact finger, 150.
• Contact plate, 67, 68, 79.
• Contact screws, 93.
• Contact surface, 66.
• Continuous, 145.
• Converter, 176.
• Converting, 142, 145, 146.
• Copper, 18, 34, 36, 65, 66, 132, 133, 134, 135, 136, 137, 142, 143.
• Copper cyanide, 133.
• Copper plate, 33, 35, 58, 67.
• Copper sulphate, 57.
• Copper voltameter, 55, 57.
• Core, 27, 28, 36, 39, 40, 115.
• Core, magnet, 75, 93.
• Counter, clock-wise, 51.
• Coupled, 36.
• Crank, 30.
• Crookes' tube, 184.
• Cross bar, 52, 66.
• Crown of cups, 32.
• Crystal, 85.
• Current, 6, 7, 13, 18, 26, 27, 28, 35, 36, 37, 38, 47, 50, 51, 52, 55, 56, 57, 58, 59, 62, 63, 70, 72, 73, 90, 95, 98, 105, 108, 116, 133, 134, 135, 136, 138, 139, 140, 141, 142, 143, 147, 148, 149, 150, 152, 153, 157, 160, 161, 163, 165, 166, 170.
• Current, alternating, 150.

• Current changing, 82.
• Current conduction, 27.
• Current, continuous, 164.
• Current, direct, 145, 150.
• Current direction, 50.
• Current, exterior, 50, 150.
• Current, reversing, 148.
• Current strength, 7, 57.
• Current testing, 143.
• Cut-out, 120.
• Cutter, 14.
• Cutting, lines of force, 38.
• Cylinder, 44.
• Cylindrical, 43.

D

• Dash, 95, 97.
• Decoherer, 106, 108.
• Decomposed, 57, 128.
• Decomposes, 55.
• Decomposing, 123.
• Decomposition, 12, 35, 82.
• Deflected, 54.
• Degree, 135, 162.
• Demagnetized, 24, 72.
• Deposited, 58, 133.