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For time-observations and exchange, sidereal chronometer No. 1491, Negus, was always used. The galvanic connections were made by means of a switch-board, the connections of which are given in the following diagram:
SWITCH 1.-Closed when receiving from connected station; Nos. 2 and 3 open.
POINTS WITH WHICH CONNECTIONS WERE MADE, &C.
Connection was made with Salt Lake City on the nights of July 29th and 30th, and August 2d, 5th, and 6th. Observations for time were made at Colorado Springs on the nights of July 28th, 29th, 30th, and 31st, and August 2d, 4th, 5th, and 6th; at Salt Lake on the nights of July 28th, 29th, 30th, and 31st, and August 1st, 2d, 5th, and 6th.
The reductions of time-observations for Colorado Springs were made in the field by the astronomer, and also those made at Salt Lake after returning from the field. He also made a new reading of the signals sent and received from both stations.
The telegraph-line between Colorado Springs and Salt Lake is 763 miles long, and divided into four circuits. The signals are transmitted from one circuit to another by means of automatic repeaters: one placed at Denver, Colorado Territory; one at Cheyenne, Wyoming Territory; and one at Corinne, Utah: the length of the line being from Colorado Springs to Denver, 75 miles; from Denver to Cheyenne, 106 miles; from Cheyenne to Corinne, 537 miles; and from Corinne to Salt Lake, 45 miles; using at every station sixty-five Grove cells.
The use of the wires was always freely tendered by the Western Union Telegraph Company, although in many cases they were needed at the same time for the transaction of the regular business of the company.
It sometimes occurs when two lines of wires are fixed to the same poles that, during heavy storms, the wires are brought in contact by oscillation, which was overcome in this case by connecting the two wires at an intermediate station, Denver, Colorado, upon the suggestion of Mr. Woodward, the superintendent at that point.
Tabulation of Stars used for Determination of Time at Colorado Springs, Colorado, and Salt Lake City, Utah.