Johnson's natural philosophy and key to philosophical charts : illustrated with 500 cuts; being reduced photographic copies of all the diagrams contained in the author's philosophical series of indestructible school charts ; for the use of schools and families (1878)
when transparent, is Illuminated with a concave mirror; 268 OPTICS. when opaque, it is illuminated by concentrating light upon it witha lens. The microscope is employed in the study of botany, entomology,anatomy, physiology, and for many purposes. To find the power of a compound microscope,… … It consists of a dark box, in which a lamp is placed before a parabolicreflector; the light being concentrated and reflected upon a plano-con-vex lens L; by which it is further concentrated, and directed upon theobject painted upon the glass slide, inserted at FF. The magnifyinglens, T, is placed…
Physics · Astronomy
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