Tilghman's Sand Blast: Patented Oct.8,1870. [Circular.]

93 Federal St abrade action air blast B. C. Tilghman beautiful bichromated gelatine bichromatized Black diamond Blast Glass Co Boston caoutchouc chilled iron cock concen copied copper plate corundum cubic inches cut hard substances delicate line engravings depolish the surface depolishing of glass effect electrotype emery erosive power etching fast as Italian feet per day figures film finest line glass is covered Granite cuts grinding glass Hard Sandstone harder hole horse-power illustrated impact inch thick inches of water intaglio intricate and elaborate Italian marble lace lithographic stone Loss machine material metal minute moulding mouth-piece ornaments particle PATENTED OCTOBER pebble photographic negatives photographic pictures plate of glass pounds pressure printers produced protect quartz quartz-sand regulated sand blast rock Sand Blast Glass Sand driven sand-blast process slate specimens steam jet steel stencil stone and glass surface of glass TILGHMAN'S SAND BLAST Topaz tration of energy tube wear wood zinc plates