This was Protector’s high-candle-power lamp. The CT33 was a bonneted Mueseler-type lamp with an inner-glass-combustion tube suspended from the chimney.
Production of this and the CT33A lamp started in 1935 and went on into the 1950s.
In order to compete with the influx of electric lamps, flame-safety lamp-makers began to develop high-candle-power (HCP) lamps. They were larger lamps, often with elaborate bonnets, that produced considerably more light. Even the most effective standard lamps could only produce light equivalent to about one candle (one candlepower). HCP lamps could produce between four and six candlepower.
The Protector company was formed in 1873 in Eccles, and produced lamps based on the patents of the works manager, W. E. Teale. In 1889, Teale left the business, and in 1890, Joseph Prestwich, who had previously been involved with sales, was named development engineer and soon after director. The company grew and expanded and with the later development of the type 6 series, became the main supplier to the British coal-mining industry.
