442 Memorandum on the Construction [No. 138. 



of it was also approved by Lieutenant Thuillier, the Revenue Surveyor 

 of Sylhet, who was in temporary charge of the Patna Survey, during 

 the absence of Lieutenant Maxwell. 



Extract of a letter from Lieut. Maxwell, Revenue Surveyor. 



I hope the following will be satisfactory to you, and will prove to the 

 world, that the little instrument deserves the name you have given it. 

 I send exactly what I did, and assure you that I have not attempted to 

 force the observations into good ones, they are all bona fide ones. 



On the 27th, the morning observation was 70 50 

 Evening, ... 63 00 





7 



50 





3 



55 Var. of needle. 



28th, the morning observation was 



71 



30 



Evening, 



63 



30 



8 00 



4 00 Var. of needle. 

 I placed two poles on the line (radius when set to the 4°), and the 

 following angular observation from my meridian line, (whose bearing is 

 352° 59'), gives a capital result. 



The true bearing of line A B is 352° 59'. 



L A B C.=41° 34' .-. bearing of line B C is 214° 33. 

 Interior L B C D.=325° 22' .-. bearing of line C D is 369° 55'. 



Line C D is set by your little instrument at 350° 00' .*. the differ- 

 ence is 5'. Considering the difficulty of seeing through the sights, you 

 will perhaps agree with me in thinking the result most satisfactory. 

 There is no doubt whatever, that if an instrument like yours were made 

 with a rack and pinion and divided to minutes, that the utmost accu- 

 racy would be obtained. 



Extract from another letter from Lieut. Maxwell, Revenue Surveyor. 



It is indeed an excellent "hikmut;"* its great beauty is its simplicity, 

 for the most ignorant can use it, and I can with great confidence state, 



* "Contrivance." 



