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carefully cleated to

the ceiling, carried on porcelain

insulators, - insulated wire

concealed in a
moulding consist-
ing of a backing

- thick and a
capping — thick,

run in conduit, wires of opposite polarity being separated not less than —-.

In no case shall insulated wires be carried in such proximity to heated surfaces, vapors or air as to endanger their insulation.

(See p. 51, sec. 25.)

59. Starting Plant and Instruction.

(See p. 51, sec. 26.)

60. Renewal

Parts.

(See Note: p. 52, sec. 27.)

61. Summary. Each bidder shall fill out completely, so far as it pertains to his apparatus, the following summary: Number of direct-current dynamos — Trade number or designation . .

Number of alternating-current

dynamos . . . . . .
Trade number or designation ...
Number of exciter dynamos ..
Trade number or designation ..
Rating of dynamos in volts ..
Rating of dynamos in amperes.
Rating of exciters in volts ...
Rating of exciters in amperes. .-
Self or separately excited ...
Shunt or compound .....
Reduction recommended in convert-

ers . . . . . . . . .
H. P. required to be delivered at pulley

at full load · · · · · ·

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board Appara

nections.

63. Switch. There shall be placed upon this switchtus anda Con- board, in addition to all the dynamo regu

lating apparatus, such switches, cut-outs and other appliances as are necessary for the proper and convenient manipulation of the circuits, such appliances to be named by each bidder in his proposal.

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For the two-wire, direct-current sys. tem the appliances and connections shall be such as will permit any dynamo to be added to or taken from parallel circuit without in any manner affecting the operation of the dynamos remaining in circuit, or the candle-power and steadiness of the lamps.

For the three-wire, direct-current system the appliances and connections shall be such as will permit any dynamo on either side to be added to or taken from parallel circuit without in any manner affecting the operation of the dynamos remaining in circuit on that side, or the candle-power and steadiness of the lamps; and a breakdown switch for connecting the two outside wires in case it shall be. come necessary or desirable to operate on the two-wire system.

For the alternating-current system the appliances and connections shall be such as will permit the operation of any dynamo on any circuit or number of circuits, and the cutting in or out of any dynamo or circuit with certainty and rapidity, without in any manner affecting the operation of other dynamos or circuits (and such that it will be possible to connect two dynamos together by an arrangement of switches or combination of circuits.) (For switchboard connections see secs. 30 and 31, pp. 55 and 56.

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Series Arc System, Direct or Alternating

Current.

This contractor shall furnish, and, unless otherwise specified, install the following apparatus and material:

mo(8),

– arc light dynamo(s) (each) hav. 65. Dynaing a capacity of —,— c.p., — ampere, - volt arc lamps.

Each dynamo shall be provided with a regulator which shall automatically make the proper adjustments for all changes of load from no load to full load, the adjustments to be made in such a way as not to endanger any part of the dynamo, appliances or lamps, nor to cause any perceptible change in the balance remaining in operation; shall be of the latest and most efficient pattern; mounted on a base provided with an adjustable belt-tightener, so that the belt may be tightened while in operation; capable of operating under full

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