Ramsden, Jesse (1735–1800)

Instrument-maker, born in Halifax, Yorkshire, England,
the most outstanding maker of precision scientific instruments
of the eighteenth century, producing extremely precise
scaled circles. In 1775, he made the first dividing machine
that could enscribe precise divisions on the borders
of small-diameter circles. He made the theodolites with 3
foot diameter circles used in triangulation to connect the
geodetic networks of France and England, and the large altazimuth
instrument with a 5 foot diameter vertical circle
built for PIAZZI. His telescopes used achromatic lenses according
to DOLLOND’s design (Ramsden was married to his
younger sister). His name is commemorated in the design
of the Ramsden eyepiece.

and NOT the Ramsden ringpiece

Copyright © Nature Publishing Group 2001
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"Ramsden was married to his younger sister"

Sounds about reyt ....

 

Aye, it could have been a tad better written nt