LVIII. Observations of the transit of Venus over the Sun, on June 3, 1769; and the eclipse of the Sun the next morning; made at East Dereham, in Norfolk, by the Rev. Francis Wollaston, F. R. S. Extracted from some letters addressed to the Rev. Nevil Maskelyne, F. R. S. and Astronomer Royal

Abstract

The telescope I used was a reflector of Short's, of 12 inches focus, with a power that magnifies about 55 times. My clock was made by Holmes. It escapes dead seconds, has a pendulum with a wooden rod, and is firmly fastened to a stack of chimnies in the room where I observe. I had lately received it from London, and regulated it by transits of the Sun and stars, taken with a transit instrument of a peculiar kind (described at the end of this account); and also by equal altitudes of the Sun, taken with another instrument of my own make.