Morton, Edward Reginald, 1867- · New York : E.B. Treat & Co. · leaf 147
masks orscreens, and such as reaches the plate itself should bediffused by means of opal glass. See Fig. 47. If the source of light is an incandescent lamp bulb, itis well to have an adjustable resistance at hand so that itcan be slightly dimmed if necessary, as slight differencesare obliterated if… … SPfeESS Fig. 47. Illuminating Desk lor X-ray negatives. A very good device is a japanned tin bos of semi-cylindrical form, on the flat side of which are grooves fora sheet of opal glass and for the largest size of X-rayplate it is desired to use. An electric lamp is mountedinside, and, in a…
