Measurement of light and colour sensations : a new method of investigating the phenomena of light and colour by means of the selective absorption in coloured glass, graded into scales of equivalent colour value
Lovibond, Joseph W. (Joseph Williams), 1835-1918, George Gill and Sons, publisher · London : George Gill and Sons, Minerva House, Warwick Lane, E.C. · leaf 147
two pieces of glass cemented together, the smallest face of which just fits into the tray, and is used to slightly compress the powder, so that the frame, b, may be removed without disturbing it, after which the original two-tenths in thickness are pressed into one-tenth with the broad side of the… … Fig. 10. Fabrics and paper, if not already smooth, are made so by pinning on a block. Yarns are wound closely on a block, and as illustrations I have permission to use a set of measurements of the " Holmgren " colour vision wools, which were made and classified for the use of the Colour Vision…
Color · Light · Optics
Internet Archive · Getty Research Institute · Public domain. Free to use for anything.
