LONGITUDE. 



201 



The record of the flashes^ to establish the clifFereuce of longitude between Frontera and Sau 

 Elceario^ is given as a means of determining the weight to be attached to this mode of observing. 

 Assuming the result to be correct, it gives a very* satisfactory coincidence between the results 

 obtained for longitude at Frontera and San Elceario, by moon culminations, by two independent 

 positions, with different instruments and different observ^n-s. 



The record is omitted for other stations, but the results are given in the following table : 



TABLE IV. 



BecapUulation of differences of Jongititde of several astronomical stations on the Bio Bravo ^ found 



hy flashes of gunpowder. 



Dale. 



No. of 



4 



flasheij. 



185-2. 





Feb. 14 



14 



18 



15 



19 



12 



Mar. 14 



12 



June 21 



« » 



Difference of long, between 

 Frontera & EI Paso. 



f. 



16.03 



16.06 

 15.84 

 15.84 



No. of 

 flashes. 



Difference of long, betwetn 

 Frontera & San Elceario. 



13 

 15 

 15 

 14 



1 07.16 



1 07.54 



1 07.36 



1 07.15 



Difference of long, betweeen 

 EI Paso & San Elceario. 



t. 



51.13 



51.48 

 51.52 

 51 . 31 



No. of 

 flashes. 



DilTcrrnce of long. bcHveen 

 San Filceario and mouth 

 of Cafion. 



m. 9. 



13 



2 30.01 



TABLE V. 



r 



Long, of station near Presidio del Norte^ computed from observations ivitli transit^ hy W. II. Emory. 



1852. 

 July 2 



27 

 28 

 29 

 Aug. 24 

 25 

 27 

 28 



July 30 

 31 



Auii. 1 



3 



m 



4 

 29 



With tabular R. A. in Nautical Almanac. 



Observations on moon's 1st limb 



do 



ao 



do 



do 



do 

 do 



do 



do 

 do 

 do 

 do 

 do 



■ • • ■ t ■ ■ UO •■■■t*a-a*»* UO • k • * • 



3 7 



Sum 



Mean 



Observations on moon's 2d limb 



do 



do 

 do 



QO /9a»9 IB*** 



do ■■««• (••• 



o • « « fl « 



do 



do ••*•<« ••••«• UO •■a<« M>»««*«»t9Ct 



do 



do 



d 



do 



Sum 



Moon's 2d limb — mean 

 Moon=>s 1st linib~m an 



Sum. 



Z 



Mean %t» 



Correction to be applied for tabular e 



Long, of station near Presidio del Norte, 

 comoutcdwitheleaaents from N. A„, 



Vol. 1 -26 



With Greenwich observed R. A. 



h, trim s. 



6 57 18.17 



27.32 

 37.41 

 17.00 

 24.76 

 17.56 

 06.04 

 03.41 



i! 



8)151.67 



6 57 18.96 



6 57 23.82 



11.67 

 35.48 

 06.73 

 95.13 

 36.06 

 08.70 



7)146.59 



6 57 20.94 

 6 57 18.96 



39,90 



6 57 19 95 

 + 11.96 



1652. 



July 26 



27 

 28 

 29 

 Aug. 24 

 25 

 97 

 28 



Observations on moon's 1st limb 



July 30 



31 



Aug. 



1 



S 

 3 



4 

 29 



1 



6 57 n.21 



do 

 do 

 do 



jio 

 do 



..do 



do 



do . 



do 

 do 

 do 

 do 

 do 

 do 



Sum 



Meau 



Observations on moon's 2d limb 



»«,,, ...do.., ., ..do 



•••»• **^ uO 

 ■ • • • • • ■ aUO 



do 



•*ftt«« •* 



,do 



do 



do 

 do 

 do 

 do 

 do 



Sum 



Moon's 2d limb -mean. 

 Moon's 1st limb -mean 



Sum 



5Ie3ii 



Long, of statioa near Presidio del Norte. 



6 57 37.53 

 47.67 

 55.76 

 34.50 

 44.76 

 39.02 

 41.35 

 20.30 



8)320.89 



6 57 40.11 



6 57 39.66 

 28.78 

 43.97 

 32.89 

 40.42 

 47.38 

 33. LO 



7J265.50 



6 57 37.93 

 6 57 40.11 



78.04 



6 57 39.02 



6 57 39.02 



