in the length of the pendulum inbrating seconds. 339 
A repeating circle of one foot diameter by Troughton, 
A clock and a box chronometer by Arnold, for the loan 
of which I was indebted to Henry Browne, Esq. F. R. S. and 
An invariable pendulum with its support, a description of 
which will be given hereafter. To these was added, a chest 
of tools of various kinds. 
A small light waggon was constructed at the Royal Arse- 
nal at Woolwich for the conveyance of these instruments, 
and a party consisting of a non-commissioned officer, two 
gunners, (one a carpenter), and two drivers with four horses 
of the Royal Artillery, was placed under my orders : a bell 
tent, and two others of a smaller description, were issued, 
which I found particularly useful. 
His Royal Highness the Commander in Chief was pleased 
to direct that I should receive such military assistance as 
might be necessary for the safety of the instruments at the 
different stations, and for the use of barracks, where I might 
find them suited to my experiments ; and an application be- 
ing also made to the Admiralty for a vessel to convey me to 
the Shetland Islands, His Majesty's sloop of war the Che- 
rokee, commanded by Capt. T. Smith, was ordered to re- 
ceive me at Leith, and to bring me back to Scotland. 
Thus liberally provided with all that could tend to facili- 
tate the success of my undertaking, I left London on the 
24th June with Lieut. Franks of the Royal Navy, a gentle- 
man whose fondness for science induced him to accompany 
me, and arrived at Leith on the evening of the 28th. 
Here on enquiry I found that the Cherokee had not 
been heard of for some time, but the Admiralty having or- 
dered that any requisition I made should be complied with, 
