Abstract
INCLUDED in the “Catalogue of B.D.H. Fine Chemical Products”, recently received from the British Drug Houses, Ltd., London, N.I, is a leaflet describing the Lovibond comparator for use with B.D.H. indicators. The apparatus consists of a metal case, opening like a book, and furnished at the back with an opal glass screen and two partitions to take the test-tubes containing the liquid under examination. The standard colour glasses, nine in number,are fitted into a flat disc which may be rotated in the front half of the case, which contains two holes, in front of the test-tubes. By rotating the disc, a colour glass is brought into view in front of one test-tube, containing the liquid only; through the other hole the test-tube containing liquid with the correct amount of appropriate indicator added is visible simultaneously. The colour comparison can thus be quickly made. The pH. value of the colour appears at a third hole in the front of the case. Discs are available for different indicators of pH. 2.8–9.6 and also for B.D.H. Universal indicator, p. 4–11
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