BULLETIN OF THE UNITED STATES FISH COMMISSION. 
286 
its axis, two weiglits pivoted to the arms of the lly wlieel with their eeuters of motion 
opposite, and two spiral springs. The weights are each connected to one of the eccen- 
trics by an arm or rod, their centrifugal force being (;ontrolled by the spiral springs in 
such a manner that the motion imparted to them by the revolution of the lly wheel 
throws one eccentric aliead and the other back, thus diminishing their throw and 
effecting a shorter cut-off without changing the lead of the valve. 
The governor maintains a uniform speed under all the varying conditions of 
service, and the uniformity of current supplied to lamps in use is preserved by an 
adjustable resistance box and switch placed in the field circuit. 
The original wires, all copper between Nos. 10 and 20, were insulated 
with woven cotton and white lead, extra covering of rubber being used where they 
passed through damp places; liard rubber tubes encased them where they led through 
bulkheads, and in hot places, such as the engine and fire rooms, they were drawn 
Cut 25. — Edison No. 3 dynamo and Ai iidnjfton A .Sims engine. 
through lead pipes; the wires were covered by battens in exposed places but they 
were led out of sight wherever xiossible, a xnactice which was soon abandoned. There 
were two main circuits. 
The vessel was rewired in 1893 by the Pacific Electric Storage Comxiany, of San 
Francisco, Cal. The highest grade rubber-covered, moisture-j)roof B. & S. wire of 
Nos. 1, 0, 8, 10, 12, and 14 was used, all run in water-tight white-pine moldings, 
l)ainted before and after the wires wei'e run. The moldings are all in xilaiii view and 
easy to get at. E.xtra j)rotection is given to wires jiassing through bulkheads. 
Circnits: There are eight circuits, as follows, all controlled by a switch board 
l)laced near the dynamo: 
No. 1. Cal)in .and w.avd-room, port side. 
No. 2. Cabin and ward-room, starboard side. 
No. 3. Deck-Louse, outside. 
No. 4. Drum-room, galley, deck-house rooms. 
No, 5. Laboratory and chart-room, starboard side. 
No. G. Laboratory and chart-room, ]>ort side. 
No. 7. Steerage, main deck, forecastle starboard 
side. 
No. 8. Steerage, main deck, forecastle port side. 
