TUl': RlTNniAL AND THK CLOCK. 113 



and Pmulils and the astronomers of Europe, and having pre- 

 pared all the apparatus of an observatory do you so labour for 

 the ascertaining of the point in question that the disagreement 

 between the calculated times of those phenomena and the 

 times in which they are observed to happen may be rectified." 



Jeysing justly remarks that this was a "mighty task," 

 but " having bound the girdle of resolution about the loins of 

 his soul " he constructed several of the instruments of an 

 observatory in brass. "But finding that brass instruments 

 did not come up to the ideas which he had formed of accu- 

 racy becaiise of the smallness of the size, the want of division 

 into minutes, the shaking and wearing of their axes, the dis- 

 placement of the centres of the circles and the shifting of the 

 planes of the instruments ' ' he erected the existing great 

 works "of stone and lime of perfect stability with attention 

 to the rules of geometry and adjustments to the meridian and 

 to the latitude of the place." He found the new instruments 

 successful ; but in order to confirm the accuracy of the obser- 

 vations made by them he caused others of similar kind to be 

 constructed at Sewai Jeypur, Matra, Benares and Ougein ; 

 and found his first calculations verified. 



Jeysing presented his new set of tables to the emperor, who 

 stamped them with his approbation. The almanacs of Delhi 

 and all astronomical computations are still made from these 

 tables. 



The observatory is situated amid piles of ruinous palaces, 

 attesting most impressively the former but lost magnificence of 

 Delhi; — without the gates, about a mile and a quarter dis- 

 tant from the city. It consists of several buildings. 



The first is a large equatorial dial, tolerably entire in its 

 outline ; but the edges of the gnomon and of the circle on 

 which the degi'ees were mai'ked are broken in several places. 

 The gnomon measures above ii8 feet at its base, (each side) 

 is computed at 104 feet and its perpendicular height at nearly 

 57 feet. This instrument Jeysing speaks of as "the prince 

 of dials." It is built of stone, ])Ut the edges of the gnomon 



