(See p. 46, sec. 25.) (See p. 47, sec. 26.) (See Note: p. 47, sec. 27.) Each bidder shall fill out completely, so far as it pertains to his apparatus, the following summary: Number of direct-current dynamos Number of alternate-current dynamos Shunt or compound Reduction recommended in converters H. P. required to be delivered at pulley (See p. 48, sec. 28.) 59. Starting Plant and Instruction. 60. Renewal Parts. 61. Summary. 62. Switchboard. 63. Switch atus and Con There shall be placed upon this switch-board Apparboard, in addition to all the dynamo regulat- nections, ing 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. For the two-wire, direct-current system 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 remaining dynamos 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 remaining dynamos 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 become 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 impossible to connect two dynamos together by any arrangement of switches or combination of circuits. (For switchboard connections see secs. 30 and 31, p. 50.) (See p. 51, sec. 32.) Arc Series System, Direct Current. This contractor shall furnish, and, unless otherwise specified, install the following apparatus and material: 64. Circuits. arc light dynamo(s) (each) having a 65. Dynan:o(s). c. p., ampère, capacity of volt arc lamps. 200 ५.८ 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 belttightener, so that the belt may be tightened while in operation; capable of operating under full load for consecutive hours without increasing the temperature of any part, especially the armature, fields, and commutator, to such a degree as to endanger the insulation or decrease the efficiency of operation; shall have an insulation resistance of 66. Foundations. 67. Instruments. not less than (See p. 54, sec. 34.) (See Note: p. 45, sec. 23.) There shall be provided with each dynamo, in addition to the automatic regulator required above, one ampère meter for indicating the current supplied by the dynamo and graduated to read ampères; one brush jig for trimming the brushes; one insulating baseframe, provided with rails and a suitable device for shifting the position of the dynamo A to alter the belt tension; one main switch; one pair of efficient lightning arresters; and for the general installation one testing mag-neto capable of ringing through (See p. 56, sec. 36.) ohms. single carbon 73 68. Cables to Switchboard. 69. Arc Lamps. triple carbon There shall be provided single mech arc lamps of —— nominal candle power. Each Boards. hanger boards for inside use, each 70. Hanger waterproof hoods, complete with 71. Hoods. hanger boards for outside use out-rigger attachments cross-suspension attachments. |