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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 Rulet, 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.

A.

Alternating current, 154.
Alternating system, rules for, 163.
Ampere, 10.

Analogies, limitations of, 8, 9.

Analogues, hydraulic, 29, 36.

Approved wire, list of, 80.

Arc, formed by two wires, 47; caused
by leakage, 48; in arc lamp, 33.

Arc lamp, automatic switch in, 96;
clamps, 97; globes, wire netting
around, 97; hand-switch, 96;
hanger-boards, 98; plated and
plain carbons for, 98; resistances,
146; rules for, 93; spark-arresters,
98; stops, 97.

Arc lights on low-potential circuits,
rules for, 144.

Attendance, rules for care and, 00.

Automatic circuit-breaker, 161.

Automatic switch, arc lamp, 96.

Automatic cut-out, incandescent
lamp, 101.

B.

B. & S. gauge, 69, 111.
Base frame, 57.
Batteries, 168.
Branches, fuses on, 129.
Burrs and fins, 143.
Bushings for sockets, insulating, 151.
Bus-bars, 62.

C.

Calculation, wire, 21-27.
Car-houses, rules for, 163.
N

Car wiring, rules for, 163.
Carbons for arc lamp, plated and

plain, 98.
Care and attendance, rules for, 60.
Carrying capacity of wires, 62; table

of, 13T>, 136.
Casing, fixture, 144.
Catch-box, 107.
Catch, safety, 133.
Ceiliug-block, fixture, 144; (rosette),
161.

Central stations, rules for, 56.
Clamps, arc lamp, 97.
Closet, fuse, 128; system, 41.
Combination fixture, 131.
Conductors, in dynamo rooms, rules
for, 60; of alternating systems,
rules for primary, 159; of alter-
nating systems, rules for second-
ary, 160; loss of force in, 13-19;
of high-potential systems, rules
for outside, 79; of high-potential
BysteniR, rules for interior, 86; of
low-potential systems, rules for
interior, 108; of low-potential
systems, rules for outside over-
head, 104; of low-potential sys-
tems, rules for underground, 105.
Conduit, 51, 115, 124; rules for in-
terior, 122; iron-armoured, 127.
Converters, 154; rules for, 153.
Cross-connection, 81.
Current, 4,5,9,10; alternating, 154;
choosing path of least resistance,
38; direct, 157; heating effect of,
13-18; induced, 155; unit of, 10.
Cut-out, 75; incandescent lamp auto-
177

matic, 101; covered,75,130; double-
pole, 76; fusible, 75; plug, 130;
(service switch), 90.
Cut-outs, rules for double-pole safety,
127.

D.

Decorative series lamps, rules for,

152.

Detecting or indicating devices, 73.
Direct current, 157.
Distribution, systems of, 28.
Double-pole, 76; safety cut-outs,

rules for, 127.
Double contact, 92.
Drip-loops, 88.
Drip-pans, 78.
Drop, 22.

Dynamo, 57; rooms, rules for, 56;
rooms, rules for conductors in, 60.

E.

Each side of circuit, 69.
Earth, 69.

Electrical pressure, 9, 57.
Electrical units, the, 9, 10.
Electric gas-lighting, rules for, 146.
Electric railways, rules for, 160.
Electrolysis, 167.
Electro-magnetic devices, 102.
Electro-motive force, 9, 57; unit of,
10.

Equalizer, 61.

P.

Feeders, 163.
Filled, 57.

Fished on the loop system, wires,
118.

Fixture, burrs and fins, 143; casing,
144; combination, 131; ceiling-
block, 144; insulating-joint, 141;
sealed, 143; shells, 143; wires,
143; work, rules for, 139.

Flexible cord, rules for, 148.

Fusible cut-out, 75.

Fuse, 48, 75, 130-135; block, 76;

closet, 128; length of, 130, 134;
link, 133; on branches, 129.
Fuses, rules for safety, 132.

Q.

Gas-lighting, rules for electric, 146.
Gauges, 69, 111.
Generator, 57.
Generators, rules for, 56.
Globes, vapour-tight, 148.
Globes, wire netting around arc-
lamp, 97.
Ground return wires, 163.
Grounds, 59,117.
Guard-irons, 82.

H.

Hand spring-switch for series incan-
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.

High efficiency, incandescent lamps
of, 26.

High potential, 57; systems, rules
for, 79; systems, rules for interior
conductors of, 86; systems, rules
for outside conductors of, 79.

Hydraulic analogue, of multiple cir-
cuit, 36; of series circuit, 29.

L

Incandescent lamp, 17.

Incandescent lamps, in series cir-
cuits, rules for, 101; of high
efficiency, 26.

Indicating devices, detecting and, 73.

Induced currents, 155.

Induction, 154.

Inside wiring of low-potential sys-
tems, rules for, 108.
Insulating hushing for sockets, 151.
Insulating-joint for fixtures, 141.
Insulating-tubes, 62, 89, 112.
Insulation, general nature of, 5.
Insulators, 01, 62.

Interior conductors of high-potential

systems, rules for, 86.
Interior conduit, rules for, 122.
Iron-armoured conduit, 127.
Isolated plants, rules for, G6.

J.

Jack-knife switch, 138.
Joint, insulating, 141.
Joint, twisted, 84.
Junction-box, 124.

K.

Keyless sockets, 147.

Key sockets, 147.

Knot in flexible cord, 162.

L.

Lamp, arc, 96; incandescent, 17.

Lamps, and other devices, rules for
arc, 95; of high efficiency, incan-
descent, 26.

Leakage, arcs from, 48; through
base frames, 58; troubles from,
6, 58,117.

Length of fuse, 130,134.

Light and power from trolley wires,
164; rules for, 163.

Lightning, arrester, 68; arresters,
rules for, 67; discharges, 70.

List of approved wire, 80.

Loop system, wires fished on the, 118.

Loss of pressure in conductors, 13-19.

Low potential, 57; interior con-
ductors, rules for, 109; inside
wiring, rules for, 108; outside
conductors, rules for, 104; service-
switch, 109; underground conduc-
tors, rules for, 105.

M.

Make and break, 138.
Materials, note in rules on, 174.
Methods of wiring, 46.
Miscellaneous rules, 170.
Motor, 57; case, 78; resistance-boxes,
75,79; service-switch, 93.

Motors, rules for, 74.
Moulding, 114, 120"; rules for, 120.
Multiple arc, 72.
Multiple-series system, 102.
Multiple system, 36; hydraulic ana-
logue of, 36.

N.

Neutral wire in three-wire system,

43.

O.

Ohm, 10.

Ohm's law, 20, 21.

Opposite polarity, 115.

Outside conductors of high-potential
systems, rules for, 79; of low-
potential systems, rules for, 104.

P.

Path of least resistance, current

choosing, 38.
Plated and plain carbons for arc

lamp, 98.
Plug cut-out, 130.
Polarity, opposite, 115.
Potential, 57.

Power-stations, rules for street-rail-
way, 160.
Power-wires, 82.

Pressure, electrical, 9, 57; in con-
ductors, loss of, 13-19; of series
circuit, 31; unit of, 10.

Primary batteries, 168; rules for
storage or, 168.

Primary conductors, rules for, 159.

Primary coil, 155.

Proportioning of wires, 13.

Protectors, rules for wire, 171, 172.

R.

Railway return circuit, 166.
Railways, rules for electric, 160.
Rate of work, 32.

Resistance, 8, 10, 12, 13, 20; box, 61,
66; boxes and equalizers, rules
for, 66; boxes, rules for motor, 75;
unit of, 10.

Resistances, arc lamp, 145.

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