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Image 8005577: Beechey's Trinoptric lantern 

Image of hardware 2000095:   Trinoptric lantern (triunial or triple lantern, maker unknown, n.d.)

Beechey's Trinoptric lantern
Type of image:digital scan 
Notes:The lantern is seen from the rear, with its three lenses extending on the remaining three faces of the lantern body. The two mirrors (A) would be adjusted to bring the images from the two side lenses into registration on the screen with that from the main lens. 
Item using this image:

equipment: image of