Directions for use of the Krōmskōp lantern
A late-Victorian instruction booklet of 1898 published in London by the Photochromoscope Syndicate, describing the Krōmskōp, a lantern for projecting colour photographs, aimed at buyers and operators of the apparatus. Its three engravings show the lantern's external form from two angles and a plan diagram of its internal light path and lenses, which a designer could use for mechanical line drawings of optical devices.
