220 Mr Bryson on Baily’s Compensation Pendulum. 
vented their recoil. When the men were boring the holes for the 
lewises in the stalk, they stood on the upper floor or board U; and the 
jumpers used to bore the holes were worked through guides fixed to the 
frame of the machine. At the end of a day’s work, the lewises were 
taken out and used over again in the next day’s ascent. The ascent of 
280 feet occupied nearly nine days, including the time spent in repairing 
the rent. The men were hoisted to the cage by a windlass on the ground, 
the rope from which worked over a large pulley within the machine. 
Report of the Committee of the Royal Scottish Society of Arts, on 
the Climbing-Machine, used at St Rollox by Professor Gordon 
and Mr Hill. 
The Committee having examined the apparatus employed by Professor 
Gordon and Mr Hill for ascending the chimney of St Rollox, and the 
accompanying description of it, beg leave to report as follows :— 
First, The application of machinery to the ascent of high elevations, 
under similar circumstances, so far as the reporters know, is new. 
Second, The mechanical arrangements for raising the cradle, and also 
for preventing its fall, are simple and well devised. 
Third, Its use at St Rollox is the best proof that the reporters can 
adduce of the success of its practical application. They have, therefore, 
to recommend it to the favourable notice of the Society, and to suggest 
that it be printed in the Transactions, 
(Signed) DAVID STEVENSON, Convener. 
Gro. BucHANAN. 
Gro. GLOVER. 
EDINBURGH, 21st January 1845. 
On a Method of rendering Baily’s Compensation Pendulum in- 
sensible to Hygrometric Influence. By Mr ROBERT BRYSON, 
F.R.S.E., Watchmaker, Edinburgh. Communicated by 
the Royal Scottish Society of Arts.* 
The well-known law by which all bodies expand by the in- 
erement of heat, and contract by its decrement, is every day 
brought under the notice of the watchmaker. To-day the 
temperature is high, all his time-keepers are slow ; to-mor- 
row it may be frost, and they inevitably gain upon their rate ; 
to obviate these inconveniences, many contrivances have been 
resorted to under the name of compensation balances and 
pendulums. 
* Read before the Society, 13th January 1845. 
