Judging the brightness and colour of light has long been contentious. Alternately described as 'impossible' and 'routine', it was beset by problems both technical and social. How trustworthy could such measurements be? Was the 'best' standard of intensity a gas lamp, an incandescent bulb or a glowing pool of molten metal? And how much did the answers depend on the background of the specialist? This book is a history of the hidden workings of physical science - a technical endeavour embedded in a social context. It argues that this 'undisciplined' subject, straddling academia, commerce, and regulation, may be typical not only of 20th century science, but of its future.
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