Portrait of Galileo with two of his telescopes, 1610

Opera or prospect glas with vellum tube, mid 18th century.

Prospect or opera glass, 18th century.

Selection of four opera or prospect glases, 1749-1773.

Newton's first reflecting telescope, 1668.

Newton's first reflecting telescope, 1668.

Newton's first reflecting telescope, 1668.

Microscope 'selon Euler' by Chevalier, 1825-1826.

Halina slide viewer, c 1960.

A selection of early draw tube refracting telescopes, early 18th century.

Telescopes of Galileo and Newton, 17th century.

Newton's first reflecting telescope, 1668.