Panoramic camera, one in which a picture may be taken upon one flat, including an angle of 90° more or less.
Invented by Sutton.
See also photographic camera.
Founded upon the invention of Baptista Porta (1589), by Dr. Hooke, about 1674.
Improved by Wollaston, 1805. Phil. Trans., Vol.
XXXVIII. p. 741.
It consists of a glass prism a b c d, by means of which rays of light are bent by two reflections into a path at right angles to their previous direction.
A rayn by Harrison, in 1762, who invented and introduced the compensating pendulum balance, made of two metals.
See balance; chronometer.
The balance-spring, which confers upon the balance the isochronal qualities of the pendulum, was invented by Hooke, who applied it in a straight form.
Huyghens changed it to a helix.
Graham invented the dead-beat escapement in 1700.
The spring as a motor for time-pieces was invented by the Germans, and was rendered necessary to confer