f>10 The King of Oudes Observatory at Litcknow. [June, 



to mention beyond the facts that the instruments remain in excellent 

 condition, and have been industriously, and as I believe, usefully em- 

 ployed. 



The only alteration in the Meridional Instruments, which are in as 

 excellent order as when they were first put up, is the introduction in 

 the Mural Circle of a collimating eye-piece, the invention of Mr. Tay- 

 lor of Madras, by the aid of which the image of the fixed horizontal 

 wire in the eye end of the Telescope is seen reflected from the surface 

 of Mercury and the zenith point is obtained at a much less expense of 

 time, and I have reason to think with at least equal accuracy, as by the 

 former method of observing the direct and reflected images of several 

 stars. Its use for measuring the collimation error of the transit instru- 

 ment would be equally advantageous were it not that the great height 

 of the latter instrument above the floor makes its application inconve- 

 nient. I have before alluded to the tall pillar on which I was obliged to 

 mount the Equatorial Telescope, and this beautiful instrument has been 

 less frequently employed than under the more favorable circumstances 

 of its pier being shorter and more stable, it might have been ; but a 

 good number of Eclipses of Jupiter's Satellites have been observed, and 

 it is well suited for observing occultations of stars by the Moon, al- 

 though from the pressure of business in the Magnetic Department, 

 which has occupied a good deal of my own time, it has not been 

 brought into use so frequently for this purpose during the last year as 

 I hope it will be in future. 



For the Magnetic Department we have received an instrument which 

 was commissioned two years ago for experiments on absolute intensity, 

 the measurement of which had hitherto been effected with the aid of a 

 less perfect apparatus constructed by myself on the spot. An Induc- 

 tion Inclinometer has also been commissioned to supersede the Balance 

 Magnetometer, which here, as elsewhere, has proved to be an instru- 

 ment of inferior value ; but its despatch from England has not yet been 

 reported. 



The Meteorogical Instruments are in good order, and Oster's self- 

 registering Anemometer continues to act well, with the exception of a 

 fault which I observe has been noticed in it at other places, that it is 

 not delicate enough for recording the pressure of the light winds, which 

 more generally prevail. 



