American horological journal, devoted to practical horology
A New York trade monthly of 1869, edited and published by George B. Miller for working watchmakers, clockmakers and jewellers in the United States. Its plates are technical line diagrams printed as white strokes on solid black, covering escapement geometry, gear trains, balance springs, ellipses and lettered construction lines, giving designers ready-made negative-space schematics and a library of labelled mechanical parts.
