3D - 2

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Summary: 15° and their refractive angles turned towards each other The stereoscope pictures are to be placed on the base and their centres ought not to exceed the distance of 2 ½ inches A pair of plate glass prisms their faces making with each other an angle of 12° will bring two pictures the corresponding points of which are 2 ½ inches apart to coincidence at a

Image Dimensions: 532 x 387