Magic, pretended miracles, and remarkable natural phenomena
A popular instructional volume issued in 1855 by the American Sunday-School Union in Philadelphia, explaining conjuring tricks, false miracles and optical curiosities to young readers in terms of natural causes. Wood engravings show cut-away cabinets, mirrored boxes, temple interiors with hidden chains and pulleys, and reflected figures, all built from dense parallel hatching useful for diagrammatic and stage-illusion imagery.
