18 



PERSONAL ACCOUNT. 



my sending Lieutenant Whipple tliere^ who was one of my assistants on the boundary-j I am 

 the person referred to. 



The points selected by him, and those selected by me in 1846^ are not identical^ and no survey 

 connected them; they therefore, as a general rule, cannot be compared directly with each other. 

 Fortunately, however, the only point determined elaborately by Mr. Whipple can be placed in 

 direct comparison with my reconnoissance in 1846. By reference to my journal, published by 

 Congress in 1847, it will be seen I observed with the sextant, in 1816, at a camp about one 



mile 



// 



Latitude of the camp 32^ 44' 09 



Longitude west of Greenwich 7' 38" 28\6 



Lieutenant Whipple, under my orders^ determined the junction with a 36-inch transit, and a 

 46-inch zenith telescope, to be in — 



Latitude 32^43' 32^^3 



Longitude 



T 38" ir.8 



Upon this determination of Lieutenant Whipple's being recomputed by Professor Hubbard 



and myself, introducing the new element of the corresponding observations at Greenwich, fur- 

 nished by Professor Airy_, we obtained — 



For latitude 32^ 43' 23''.3 



For longitude 7*^ 38" 24^27 



. Now, if we make allowance for this mile and a half, which was not accurately measured, we 

 find a coincidence in the two results truly remarkable, coi.sidering that I used, in 1846, only a 

 reconnoitring instrument, a small Gambey sextant. 



The above will show that Mr. Bartlett had no authority, in fact, for what he states ; and to 

 show, further, that he has given currency to an insinuation neither justified by facts nor by re- 

 liable information within his reach, I give the following letter of Lieutenant Whipple, who 

 made the re-survey of the Gila, and who is the only person from whom Mr, Bartlett could derive 

 his information : 



Wasiuxgtox, June 13, 1853. 



Dear Sir: Your note of this date communicates a paragraph from *'Bartlett's Personal Narrative/' stating that Mr. 

 Gray, in his official letter to the Secretary of the Interior, from San Diego, relating to the survey of the Gila, says, ''that 

 many erxors of others who have heen along this river, in astronomical observations, were corrected by Lieut. Whipple." 



If the above was intended, as you infer, to throw discredit on your astronomical labors in 1846, I do not hesitj.tc to 

 pronounce it unjust. During (he progress of the survey and afterwards, I freely expressed my admiration of the general pre- 

 cision with which the Gila had been laid down upon the map from your astronomical observationB. 



I am, very respectfully, your obedient servant, 



A. W. WHIPPLE. 



Camp xear Fokt Duxcan, October 1, 1852. 

 Siu : I have the honor to acknowledge this day the receipt of your letter enclosing me the commisgion of United States 

 rveyor, for running and marking the line between the United States and the renublic of Mexico. 



Your letter enclosing the appointment was handed me on the 30th of January at Sanialurca, in Mexico, t „ .ther with a 



letter of instructions, and a copy of instructions to the commissioner, dated November 4, defining the duties of the sur- 

 Teyor, and directing me to be governed accordingly. 



I have been hoping from that day to thi« to have an interview with the United States commissioner, but have not, in 



imm 



my camp at the Presidio del Norte, August 20. I received u^ express a letter from liim, a copy of which is herewith en- 

 closed, by which it will be seen he arrived at El Paso on the 16th of August, and proposed to meet me at this place. 



