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<p>The initial part of the paper summarises past researches on the pentane lamp. Subsequently general instructions are given for the setting-up and operation of the lamp, and some experiences of the lamps in the United States summarised. A curve is given illustrating change in c.p. caused by varying height of flame, and special emphasis is placed on the avoidance of vitiation of the air, cooling air-currents, etc. Nevertheless it is believed that, with care, the values attained from any lamp can be reproduced within one per cent, in the laboratory at the Bureau of Standards; and that even when used in laboratories where the climatic conditions vary greatly values within 2 per cent, should be possible. The specification of the Gas Referees for the quality%2
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<br>Subjects: lamps and lighting/ B8530B Light sources</div>
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