Sentence:  I was working with full regulator and about 40 per cent cut-off and we were going quite hard when André called my attention to the <WSD>pyrometer</WSD>. This was showing a comparatively low temperature (about 250 deg C.) which meant that unless I eased up, the boiler might start to prime. So we eased her a shade, let the water come down to a third of a glass and then we were away again in perfect order with the <WSD>pyrometer</WSD> showing about 375 deg C. 
Meaning of the word marked with <WSD> tags:  A thermometer designed to measure high temperatures.