Mast, Samuel Ottmar, 1871- · New York : J. Wiley & Sons · leaf 87
t gradermodified 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 arc all light-proof and dead blackinside, so as to prevent reflection. The outline of a crosssection at… … Fio. 4. I. A vertical Kctlon of the light grader. The lens (a), which la 8 Kg-ment of > cylinder, hai Its longitudinal axis lying In the plane of the section; b,stage; c, Kcmat glower; d, non-renecting background;*, mirror;/, light rays; f,opaque screens. Distance from glower of lamp to stage,…
Light · Phototropism
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