128 Mr. Goldingham’s observations for ascertaining 
The clock used in these experiments has a gridiron pen- 
dulum, the motion being given by a spring ; the maker's 
name is Haswell, and the works are of the best description: 
it was fixed to the north wall of the Observatory, which is 
of solid masonry two feet in thickness : the rate was ascer- 
tained by comparisons with the transit clock each day, at the 
commencement and conclusion of the experiments : the tran- 
sit of the noon before the comparison, and that after, were 
used in finding this rate ; so that four results were obtained 
from the two comparisons : the transit clock, which is an 
excellent time keeper, was regulated by transits of the sun 
and stars ; the weather fortunately having been clear, both 
at noon and at night, during the time the experiments were 
making. 
The first operation performed was that of making the 
weight of the clock pendulum black, and fixing the disc on 
the centre. This having been done, five blocks of seasoned 
teak- wood, each 4 inches in diameter and 7 in length, were 
prepared ; the place above the clock for the frame, which 
was to support the pendulum, was then marked. This I did 
with great care and precaution : intersecting lines were 
drawn upon the wall to show the exact position of the cen- 
tres of the blocks and of the screws for fastening the frame; 
holes 4 inches in diameter and io|- in depth, (it being neces- 
sary to let the outer part of the blocks 3^ inches within the 
surface of the wall, to bring the pendulum sufficiently near 
the clock case) were then made in the wall, and the blocks, 
coated with tar to preserve them from the white ants, were 
let in and firmly secured. The outer surfaces of the whole, 
which had previously been made smooth and level, being in 
