Le cylindrographe appareil panoramique
A technical treatise from 1889 by Paul Moëssard, published in Paris by Gauthier-Villars, describing the cylindrograph, a panoramic camera for photographers and surveyors. The pictures are geometric line diagrams: a point-of-view ray diagram with labelled points M, M' and S, a unrolled cylinder projection with lettered grids, and numbered plates with ray lines converging on a point O. A designer might take from them the clean, schematic vocabulary of 19th-century scientific line drawing, with dashed construction lines and lettered labels.
