130 Mr. Goldingham's observations for ascertaining 
have a support in front of the case. I therefore had a solid 
stand of teak wood made, similar to that for supporting the 
telescope, the inner part cut out to the form of the mould- 
ings of the clock-case, so that it fitted perfectly close to it ; 
in this position it was screwed to the floor ; the ends for the 
supports of the arc were then let in, and secured to the top 
of the stand, and the arc fixed in its proper place, with refer- 
ence to the extreme point of the pendulum. The floor out- 
side of this apparatus was then separated from the part of 
the floor which supported it, to prevent any shake by per- 
sons moving about within the building. 
The small telescope containing the diaphragm was now 
fixed upon its stand, and screwed to the floor at the proper 
distance from the pendulum : this was about feet. The 
telescope, and every other part of the apparatus, have been so 
fully described by Captain Kater in the paper published in 
the Philosophical Transactions, that I feel it unnecessary to 
be more particular here.* 
While making the holes in the wall above the clock for 
the insertion of the blocks for supporting the frame, a great 
deal of dust would necessarily fall upon the clock-case ; every 
part of the case where dust could penetrate was therefore 
filled up with wax, and several folds of cloth were afterwards 
secured over the whole of the case, so that it was hardly 
possible that any dust could penetrate to the works of the 
clock. After the frame was fixed, the cloth and wax were 
removed, and fresh oil applied to the works. 
* The drawing [PI. XIV] shows the inside of a part of the Observatory, the pen- 
dulum up, and the adjustment of the diaphragm making, preparatory to commenc- 
ing the observations. 
