Klotz. — Transpacific Longitudes. 67^. 



The geographic position of Station 20 was furnished by Mr. 

 Marchant, Surveyor- General. 



We have then — ° 



Longitude, Station 20 . . . . 173 31 371 

 Station 20 to Station A (bv Mr. 



Blake) .. .. ' .. 2 2i-l 



Station A .. .. . . 173 29 130 



Station A to observatorv (bv Mr. 



Blake) .. .'. " .. 3-66 



Observatory 173 29 9U 



or, 11 h. 33 m. 56623 s. The Canadian value is 11 h. 33 m. 56-U6 s. 

 Difierence, 0-477 s., or 7-15", or 595 ft. for the latitude of 

 Doubtless Bay. 



It may be remarked that the position of Station 20 is de- 

 pendent upon the initial station. Mount Cook, at Wellington, 

 through a chain of triangles about seven hundred miles long. 

 From the roughness of the country it was expedient to carry on 

 a network of triangulation for land survey and settlement pur- 

 poses, and the refinements of a primar}' triangulation were not 

 aimed at. In the closing for Wellington it will be found that 

 the difEerence is 0-038 s., or 0-57", and of the same sign as the 

 above, making thereby the difEerence between the telegraphic 

 determination, Wellington-Doubtless Bay, and the one obtained 

 by triangulation 0-439 s., equivalent to 549 ft. at the latitude of 

 the latter. 



In the following table is given the deduction of each difEer- 

 ence of longitude, Doubtless Bay- Wellington. Column 1 gives 

 the date ; column 2 the direction in which the arbitrary signals 

 were sent ; columns 3 and 4 the respective sidereal times at 

 the two stations of the mean of the times of the signals sent ; 

 column 5 is the comparison of the scalings of the same signal — 

 that is, each signal is measured on the two chronographs and 

 expressed in time to the hundredth of a second of the respective 

 clock ; there would be at least thirty such signals, and each 

 signal would show the " difEerence " between the two clocks at 

 that instant, plus or minus the " transmission-time," according 

 to the direction sent, westward or eastward ; the " difEerence " 

 given in column 5 is the mean of the thirty individual difEerences. 

 If the two clocks had no rate, or the same rate, then the difEerence 

 between the comparison of signals sent in the two directions 

 would give twice the transmission-time ; when, however, the 

 clocks had difEerent rates, we must introduce the correction 



