1891 Article Rock-blasting Electric Firing System Methods Machine James MAB1 EM2 studies of light

studies of light

New York/ Professor D

These are three original 1906 halftone prints

Binoculars

1891 Article Rock-blasting Electric Firing System Methods Machine James MAB1 EM2 studies of lightThis 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.