Photograph of siderostat by Foucault of the Paris Observatory

1876

Photograph of 18" Siderostat in glazed frame 17 1/4" x 21 1/4"

1921

Photograph of siderostat by T Cooke and Sons, Royal Society

1876

One of two photographs of a siderostat constructed by Messrs Cooke and Sons of York

One of two photographs of a siderostat constructed by Messrs Cooke and Sons of York

Photographs (2) of a siderostat constructed by Messrs Cooke and Sons of York