Marion and Co., author · London W. : Marion and Co., 22 and 23 Soho Square · leaf 283
a bright white light with mineral oil. The Apparatus may be used in any room, provided all actinic light be excluded ; a hood, as shown in the woodcut, covers the lamp, to pre- vent any light escaping. Every part is movable, Itherefore the adjustment is easy. We append directions for use, and we… … DIBECTIONS FOR USE.— The apparatus must be used in a darkened room from which all actinic light is excluded. It will, however, of itself give sufficient light to work by. Place it on a table or bench ; a flat board should rest on an upright easel— this latter to have wheels, so that it might be…
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Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
