Samples from the light inducing continuum (top left): Leitz’s Kombinierter Vergrößerungs- und Projektions-apparat mit Lesepult (‘Combined Enlarging and Projection Apparatus with Reading Console’) pictured in Leica in Wissenschaft und Technik, Liste Mikro-Leica Nr. 7754a, Wetzlar: Ernst Leitz, October 1939, 80. Process halftone engravings, 9.2 x 5.8 cm each (approximate size). Right: Leitz’s Focomat Model I Automatic Enlarger for Miniature Negatives in operation pictured on the cover of Leitz Enlarging Equipment, List Photo No. 7040c, Wetzlar and London: Ernst Leitz, December 1937. Process halftone engraving, 18 x 12.3 cm (booklet size). Bottom left: Leitz’s Filoy enlarger pictured in Curt Emmermann, Photographieren mit der Leica, 3. und 4. Auflage, Halle: Wilhelm Knapp, 1930, 117, Abb. 43. Process halftone engraving, 6.6 x 6.6 cm (approximate size). Digital copy-stand photographs. Collection of the author.
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