1879-] 
Ancient Observatory at Delhi. 
779 
the cogs in the same line, as if indeed the southern tower 
had been turned in azimuth through the space of one cog. 
With this exception the towers seemed similar. 
The towers are well built of brick, and plastered. A 
small doorway in each led to the inner floor, 5 or 6 feet below 
the present level of the adjacent ground. 
In the interior the first rough plaster is covered with a 
fine hard one everywhere ; and that again on the portions 
marked with lines, &c., for observation, bore a still finer 
plaster, that, wherever I remarked it, had a surface, touch, 
and colour that can fairly be compared to ivory. 
Fig. 2. — Vertical Section through Centre. ^ Scale (Natural). 
a a. Centre of pillar. a b. Radius of pillar, 32*5 inches. a c. Radius of 
interior of tower, 325 inches. a d. Radius of cogs, 350 inches. 
a e. Radius of exterior of tower, about 360 inches. a f. About 
130 inches. c g. 292*5 inches. c b g h is a square, and the angle 
c g b = 45 0 . The dots along c g are the pigeon-holes for the feet. 
A zealous “ Sub ” helped me in making the measures 
from which the accompanying plan and section of the 
towers are drawm 
To commence with the plan, Fig. 1. 
The floor may roughly be described as a cart-wheel in 
shape, the eighteen spokes of which are raised from the 
ground (see Fig. 2) on five — I think, but not recorded in my 
notes — low arches. The intervals between the spokes are 
of equal breadth with the raised parts, and are at present 
covered with the exuviae of the human and animal popula- 
tion of the neighbourhood. These portions of the floor 
each extend about 2 feet radially into the thickness of the 
3 D 2 
