These lamps were employed until approximately 1960, likely not within the NCB mines when there were more than 30 individuals working below ground. The wick adjustment process involved rotating the fuel cell vertically to achieve the desired height. The locking flap underwent modification to accommodate the bars, leaving it elevated about a quarter-inch above the cage. The lamp used the Original Protector system, reminiscent of the old Type 1A utility lamp, as well as the antiquated W E Teale No. 1 and No. 2 models, along with the former Protector No. 1 iterations.
