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accepted, must be forwarded for testing before being put on the market :

1. Thoroughly vitrified and glazed porcelain.
2. Glass.
3. Slate without metal veins.
4. Pure sheet-mica.
5. Marble (filled).
6. Lava (certain kinds of).
7. Alberene stone.

On the inside of the cover of The National Code of Rules, as usually printed, are the following recommendations :

The use of wire ways for rendering concealed wiring permanently accessible, is most heartily endorsed and recommended; and this method of accessible concealed construction is advised for general use.

Architects are urged, when drawing plans and specifications, to make provision for the channeling and pocketing of buildings for electric light or power wires, and in specifications for electric gas lighting to require a two-wire circuit, whether the building is to be wired for electric lighting or not, so that no part of the gas fixtures or gas piping be allowed to be used for the gas-lighting circuit.

INDEX.

Car wiring, rules for, 163.

Carbons for arc lamp, plated and
Alternating current, 154.

plain, 98.
Alternating system, rules for, 153. Care and attendance, rules for, 60.
Ampère, 10.

Carrying capacity of wires, 62 ; table
Analogies, limitations of, 8, 9.

of, 135, 136.
Analogues, hydraulic, 29, 36. Casing, fixture, 144.
Approved wire, list of, 80.

Catch-box, 107.
Arc, formed by two wires, 47 ; caused Catch, safety, 133.

by leakage, 48; in arc lamp, 33. Ceiling-block, fixture, 144; (rosette),
Arc lamp, automatic switch in, 96; 151.

clamps, 97; globes, wire netting Central stations, rules for, 56.
around, 97; hand-switch, 96; Clamps, arc lamp, 97.
hanger-boards, 98; plated and Closet, fuse, 128 ; system, 41.
plain carbons for, 98; resistances, Combination fixture, 131.
145; rules for, 95; spark-arresters, Conductors, in dynamo rooms, rules
98; stops, 97.

for, 60; of alternating systems,
Arc lights on low-potential circuits, rules for primary, 159; of alter-
rules for, 144.

nating systems, rules for second-
Attendance, rules for care and, 60. ary, 160; loss of force in, 13–19;
Automatic circuit-breaker, 161. of high-potential systems, rules
Automatic switch, arc lamp, 96. for outside, 79; of high-potential
Automatic cut-out, incandescent systems, rules for interior, 86; of
lamp, 101.

low-potential systems, rules for

interior, 108; of low-potential
B.

systems, rules for outside over-
B. & S. gauge, 69, 111.

head, 104; of low-potential sys-
Base frame, 57.

tems, rules for underground, 105.
Batteries, 168.

Conduit, 51, 115, 124; rules for in-
Branches, fuses on, 129.

terior, 122; iron-armoured, 127.
Burrs and fins, 143.

Converters, 154; rules for, 153.
Bushings for sockets, insulating, 151. Cross-connection, 81.
Bus-bars, 62.

Current, 4, 5, 9, 10; alternating, 154;
choosing path of least resistance,

38; direct, 157 ; heating effect of,
Calculation, wire, 21–27.

13-18; induced, 155; unit of, 10.
Car-houses, rules for, 163.

| Cut-out, 75; incandescent lamp auto-

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matic, 101; covered,75, 130; double-l closet, 128; length of, 130, 134;
pole, 76; fusible, 75; plug, 130; | link, 133; on branches, 129.
(service switch), 90.

Fuses, rules for safety, 132.
Cut-outs, rules for double-pole safety,
127.
D.

Gas-lighting, rules for electric, 146.
Decorative series lamps, rules for,

Gauges, 69, 111.

Generator, 57.
152.

Generators, rules for, 56.
Detecting or indicating devices, 73.

Globes, vapour-tight, 148.
Direct current, 157

Globes, wire netting around arc-
Distribution, systems of, 28.

lamp, 97.
Double-pole, 76; safety cut-outs,

Ground return wires, 163.
rules for, 127.

Grounds, 59, 117.
Double contact, 92.

Guard-irons, 82.
Drip-loops, 88.
Drip-pans, 78.
Drop, 22.
Dynamo, 57; rooms, rules for, 56 ;

Hand spring-switch for series incan-
rooms, rules for conductors in, 60.

descent lamps, 101.
Hand-switch, arc lamp, 96.
Hanger-board, arc lamp, 90, 98; for

series incandescent lamps, 101.

Heating effect of current, 13-18.
Each side of circuit, 69.

High efficiency, incandescent lamps
Earth, 69.

of, 26.
Electrical pressure, 9, 57.

High potential, 57; systems, rules
Electrical units, the, 9, 10.

for, 79; systems, rules for interior
Electric gas-lighting, rules for, 146. ||

conductors of, 86; systems, rules
Electric railways, rules for, 160.

for outside conductors of, 79.
Electrolysis, 167.
Electro-magnetic devices, 102.

| Hydraulic analogue, of multiple cir-
Electro-motive force, 9, 57; unit of,

cuit, 36; of series circuit, 29.
10.
Equalizer, 61.

Incandescent lamp, 17.
F.

Incandescent lamps, in series cir-
Feeders, 163.

cuits, rules for, 101; of high
Filled, 57.

efficiency, 26.
Fished on the loop system, wires, Indicating devices, detecting and, 73.
118.

Induced currents, 155.
Fixture, burrs and fins, 143; casing, Induction, 154.

144; combination, 131 ; ceiling-Inside wiring of low-potential sys-
block, 144; insulating-joint, 141;| tems, rules for, 108.
sealed, 143; shells, 143; wires, Insulating bushing for sockets, 151.
143; work, rules for, 139.

Insulating-joint for fixtures, 141.
Flexible cord, rules for, 148. Insulating-tubes, 62, 89, 112.
Fusible cut-out, 75.

Insulation, general nature of, 5.
Fuse, 48, 75, 130–135; block, 76; | Insulators, 61, 62.

Interior conductors of high-potential | Motors, rules for, 74.
systems, rules for, 86.

Moulding, 114, 120'rules for, 120.
Interior conduit, rules for, 122. Multiple arc, 72.
Iron-armoured conduit, 127.

Multiple-series system, 102.
Isolated plants, rules for, 56. Multiple system, 36; hydraulic ana-

logue of, 36.

N.
Jack-knife switch, 138.

Neutral wire in three-wire system,
Joint, insulating, 141.

43.
Joint, twisted, 84.
Junction-box, 124.

Ohm, 10.

Ohm's law, 20, 21.
K.

Opposite polarity, 115.
Keyless sockets, 147.

Outside conductors of high-potential
Key sockets, 147.

systems, rules for, 79; of low-
Knot in flexible cord, 152.

potential systems, rules for, 104.

0.

L.

P.
Lamp, arc, 96; incandescent, 17. | Path of least resistance, current
Lamps, and other devices, rules for choosing, 38.

arc, 95; of high efficiency, incan- Plated and plain carbons for arc
descent, 26.

lamp, 98.
Leakage, arcs from, 48; through Plug cut-out, 130.

base frames, 58; troubles from, Polarity, opposite, 115.
6, 58, 117.

Potential, 57.
Length of fuse, 130, 134.

Power-stations, rules for street-rail-
Light and power from trolley wires, way, 160.
164; rules for, 163.

Power-wires, 82.
Lightning, arrester, 68; arresters, Pressure, electrical, 9, 57; in con-
rules for, 67 ; discharges, 70.

ductors, loss of, 13–19; of series
List of approved wire, 80.

circuit, 31 ; unit of, 10.
Loop system, wires fished on the, 118. Primary batteries, 168; rules for
Loss of pressure in conductors, 13–19. storage or, 168.
Low potential, 57; interior con- Primary conductors, rules for, 159.

ductors, rules for, 109; inside Primary coil, 155.
wiring, rules for, 108; outside Proportioning of wires, 13.
conductors, rules for, 104; service- Protectors, rules for wire, 171, 172.
switch, 109; underground conduc-
tors, rules for, 105.

Railway return circuit, 166.

Railways, rules for electric, 160.
Make and break, 138.

Rate of work, 32.
Materials, note in rules on, 174. Resistance, 8, 10, 12, 13, 20; box, 61,
Methods of wiring, 46.

66; boxes and equalizers, rules
Miscellaneous rules, 170.

for, 66; boxes, rules for motor, 75;
Motor, 57; case, 78; resistance-boxes, unit of, 10.

75, 79; service-switch, 93. | Resistances, arc lamp, 145.

M.

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