REPORT ON INSTRUMENTS. 



My transit instrument was made by Mr.T. Jones, of Charing Cross, for my observatory 

 at North-west Castle, Wigtonshire, where I had it in use four years. Its telescope was 

 thirty-six inches in length, with an object-glass two inches and five-eighths aperture, 

 and was an excellent instrument: it was the whole time under the charge of Com- 

 mander Ross. 



My theodolite was nine inches in diameter, with double telescope, and was made also 

 by Jones, for the late Captain Bartholomew. 



The diurnal variation instrument was made by Mr. DoUond, whose instructions 

 I received respecting its use, and was the same which had been made for Sir John 

 Franklin. I had also two altitude instruments made by Jones, which were supplied 

 to me from the Colonial Office, and which I used to determine the height of the Eastern 

 over the Western Sea. I had three dipping-needles, one made by Jones, which was 

 with Sir Edward Parry ; one by Pope, and one of my own construction. We had 

 five sextants; an instrument sent by Mr. Warre, which was the invention of 

 Lieut. Drummond, R.A., being a compass with apparatus for finding the latitude and 

 longitude attached to it, and was a very ingenious invention ; but, as the compass 

 had ceased to traverse where we wintered, it could not be tried. My telescope for 

 occultations was sixty-six inches focal length, with an aperture of three inches and 

 five-eighths ; the object-glass by Tully. I had also Barlow's apparatus, and Gilbert's 

 azimuth compass, and six others ; two marine and one mountain barometer. Row- 

 land's and Tyrrel's perspective instruments, the former was found of great value a.s 



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