Mast, Samuel Ottmar, 1871- · New York, J. Wiley · leaf 76
radermodified to suit the conditions of the experiments. Theimportant features in the construction of this apparatuswill be understood readily by referring to Fig. 4. Thewalls of the apparatus are all light-proof and dead blackinside, so as to prevent reflection. The outline of a crosssection at… … Fig. 4. I. A vertical section of the light grader. The lens (a), which is a seg-ment of a cylinder, has its longitudinal axis lying in the plane of the section; b,stage; c, Nernst glower; d, non-reflecting background; f, mirror;/, light rays; g,opaque screens. Distance from glower of lamp to stage,…
Light -- Physiological effect · Phototropism
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