Herschel, John F. W. (John Frederick William), Sir, 1792-1871 · London : Longman, Rees Orme · leaf 112
readings off, by the averageof which the error of graduation and of reading isreduced. This is altogether a very refined and elegantinstrument. (160.) We must not conclude this chapter withoutmention of the ce principle of repetition an inventionof Borda, by which the error of graduation may… … telescope moveable on O, the common axis of twocircles, A M L and a be, of which the former, A M L,is absolutely fixed in the plane of the objects, and carriesthe graduations, and the latter is freely moveable onthe axis. The telescope is attached permanently to thelatter circle, and moves with it.…
Astronomy
Internet Archive · York University Libraries · Public Domain Mark 1.0. Free to use for anything.
