ii4 Afr. Pictet’s Confederations on the 
5% A 3 1 feet achromatic, with great aperture, and four 
magnifying powers, made alfo by Dollond, mounted on a pa- 
ralla&ic ftand, and carrying occafionally an ocular micrometer*. 
6°, A very good Ramsden’s 30-inches achromatic refra&or 
with four powers ; betides forne other telefcopes and inftru- 
ments of lefs importance. 
The capital inft rumen ts which, I fuppofe, it would be ne- 
ceflary to fend from England, would be one or two zenith 
fedtors, one or two clocks, and the inftrument for obferving 
the terreftrial angles, the accuracy of which is of the utmoft im- 
portance. I faw in London, three years ago, that made by 
Mr. Ramsden, and employed fo fuccefsfully in the late mea- 
furements from Hounflow Heath to the French Coaft. It is a 
matter of doubt to me, whether this precious inftrument would 
be allowed to go out of the kingdom ; and even fhould that be 
permitted, as far as I can judge from the impreflion it has left 
on my memory, it would be too heavy and of too large a bulk 
to be conveniently carried to the top of mountains. The in- 
ftrument ought perhaps to be made of feparable parts eafily 
put together, and capable of being fteadily adjufted : they 
might be packed feparately in a box, not exceeding the common 
charge of a man. The boxes could be fo contrived as to fill a 
larger one, fufpended on fprings in a fmall narrow carriage 
made on purpofe, and in which all the neceffary things befides 
could be colledted. Such a diipofition would be very conve- 
nient, not only for fending the inftruments fafe from Eng- 
land, but alfo to carry them from one ftation to another 
through crofs country roads, with more quicknefs and lefs 
% We are indebted for the pofleffion of that valuable inftrument to the munifi- 
cence of my learned friend M. de Saussure, who gave it to M. Trembley, 
to whom it now belongs, 
2 
trouble 
