Flash-lamp

Previously, photographers' flash powder, introduced in 1887 by Adolf Miethe and Johannes Gaedicke, had to be ignited manually, exposing the user to greater risk.

2, while opposite the opposing pole of the lowermost cell lies a push-button contact D, on pressing which the circuit can be closed at that point to the metal casing.

[2]The principle of operation of the electrical flash-lamp is linked to the shutter of an early box camera: tripping the shutter ignites the flash powder and releases the potential energy of the exploding powder causing a bright flash for indoor photography.

The main purpose of Cohen's invention was as a fuse to ignite explosive powder to get a photographer's flash.

[4][5][6][7][8][9] In 1899, the year the invention was patented, the government awarded Cohen a $12,000 contract for 24,000[10] naval mine detonator fuses.