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Fresnel parallelopipeds mounted on brass

1876

square Fresnel lens

1975

For spotlight; 250mm diameter, glass.

Large Fresnel lens

Exhibit to demonstrate Fresnel's bi-prism. Consists of light source, slit and bi-prism housed in metal case with eyepiece so that interference fringes can be seen.

Exhibit to demonstrate Fresnel's bi-prism. Consists of light source

1971