Page 575 - 89 history of astronomy_opt

in 1738, came to England in 1758 as a trained
musician, and died in 1822. He studied sci-
ence when he could, and hired a telescope,
until he learnt to make his own specula and
telescopes. He made 430 parabolic specula
in twenty-one years. He discovered 2,500
˜
nebulA and 806 double stars, counted the
stars in 3,400 guage-fields, and compared
the principal stars photometrically.
575