Calvert, F. (Frederick) Crace', 1819-1873, Stenhouse, John, Groves, Charles Edward, 1841-1920 · Manchester : Palmer & Howe · leaf 383
ivided into two parts, consequently, whenthe liquids arc equally coloured, there will be a uniformcoloration of the disc. An instrument on this principle,devised by Mr. R. P. Wilson, is now employed in testingthe value of petroleum, with the difference, however, thatthe colour of the standard is… … Fig. 14.are attached side by side to the hinged lid of the box, andfilled with the two liquids, the colours of which are to becompared; g is a mirror by which the light is reflected andcaused to pass through the two tubes, where it is received 346 DYEING AND CALICO PRINTING. at the upper end on…
Dyes and dyeing · Calico-printing
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