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two inch Wiirdemann instrument is used, with recording-apparatus in shape of a 

 chronograph or register. 



The time set for the transmission of signals should be as near 9.30 p. m. local 

 time of the Salt Lake meridian as possible; and great care should be taken that both 

 observers shall be on hand simultaneously, so that as little delay as possible shall ensue 

 in the use of the telegraph-wires. 



In the transmission of signals the record is to be made upon the chronograph or 

 register at the two places over a space of five minutes in time, the connecting or Salt 

 Lake station sending for the first five minutes arid the distant station receiving, and 

 rice rcrxa. 



In addition to these, which may be known as the chronograph-signals, arbitrary 

 signals will be sent, by the use of a. break-circuit key, at about ten seconds apart, at 

 fractional parts of a second, making a series of thirty-one arbitrary signals during 

 the five minutes. 



In order that the observer at a station may conclude that he has accomplished 

 six nigl its of first-class observations, it becomes necessary that there should be an 

 exchange of the approximate results. Each observer will therefore send to the other, 

 upon each subsequent night or as soon thereafter as practicable, the approximate error 

 of his chronometer and the mean of seven arbitrary signals, sent and received, selected 

 from the middle of the set of thirty-one. This may be concisely expressed in a 

 telegram. 



For the full satisfaction of an observer at the distant station, such further compu- 

 tation shall be sent and received as shall seem necessary to a clear understanding of 

 the case; as an observer will be held responsible should he leave the station and go to 

 another before he is certain that the results upon final computation would prove 

 satisfactory. 



2. Observations for Latitude. 



These will be conducted through five complete and clear nights, so that there shall 

 not be less than 175 pairs of observations upon 35 separate and distinct pairs of stars, 

 each pair of which observations shall give a first-class result. 



These instructions are furnished to the observers with a view to their clearly 

 understanding the class of results intended, and will always be carried out, unless 

 unforeseen difficulties arise, in which event, as the observers will not hereafter be 

 within speedy communication of these headquarters, it will be necessary for them to 

 adopt immaterial modifications upon their own responsibility. It is, of course, under- 

 stood that each observer is responsible for and receives the credit of his own work. 



A report will be made by each observer, at intervals not exceeding fifteen days, 

 of the work under his charge. 



A full daily journal will be kept by each observer. Great care will be taken as 

 to the character of the record upon this journal, which should be clear and explicit. 

 The position of the station in reference to surrounding natural objects should be 

 clearly described, and imperishable meridian-marks firmly planted. When possible, a 

 special survey and plat will be made. 

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