Two mechanical astronomical magic lantern slides of Earths Rotundity & Tides, circa 1840.

“Rotundity of the Earth“.

and

“Illustrates the cause of the Spring and Neap Tides and shows the Moon’s phase during the Revolution“.

Attributed to Carpenter & Westley of Regent Street, London.

Frame: 18 x 11.5 cm. (Width including the winding handle: 22 cm).