ature 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,