'Solar Opake Microscope', 1787.
© Science Museum / Science & Society Picture Library
Solar 'Opake' microscope (for observing opaque rather than transparent objects (Fig 1), and large tooth and pinion microscope (Fig 2). Illustration from 'Essays on the microscope' by George Adams (1750-1795), published in London in 1787. Adams was instrument maker to King George III.