1891 Article Rock-blasting Electric Firing System Methods Machine James MAB1

This is an original 1891 one-page print article "Rock-blasting by Electric Firing" with four halftone illustrations of the machine and methods employed in the electric system of rock-blasting; manufactured by James Macbeth and Company, 128 Maiden Lane, New York. Fig. 1 shows the holes connected in series. Fig. 2 shows the Victor Electric fuses for exploding all grades of blasting powder and high explosives. Fig. 3 shows a machine testing the battery. Fig. 4 shows the standard electric fuse and blast tester. CONDITIONThis 120+ year old Item is rated Very Fine +. Moderate aging in margins. No creases. No natural defects. No surface rub. No tears. No water damage. Please note that there is bleed through showing in this article. Product Type: Original Print Article; Black / White Grade: Very Fine + Dimensions: Approximately 9 x 12.25 inches; 23 x 31 cm Authentication: Serial-Numbered Certificate of Authenticity w/ Full Provenance Protection: Packaged in a custom archival sleeve with