Sussman Type 3 electric safety lamp which was made between 1925 and 1935 and is easily identifiable by its box shaped design. The lamp was battery powered and provided miners with a brighter and safer light than the flame safety lamp.
The first electric hand lamps were often heavy using large lead acid batteries. They did however offer up to 11 times the illumination of the commonly used Marsaut flame safety lamps.
The improved performance and safety offered by electric lamps led to a substantial growth in their use underground. Only 11% of the lamps used underground in 1911 were electric compared with about 62% by 1934.