. Elementary chemical microscopy. Microscopy; Microchemistry. 120 ELEMENTARY CHEMICAL MICROSCOPY In the absence of an arc lamp use a 400-watt Mazda lamp with concentrated filament. Or if gas alone is available, employ an inverted Welsbach incandescent mantle or even better an acetylene light. Be sure that the reflecting condenser is high enough in its mounting to just touch the object cell upon the stage. Substage ultracondensers are usually screwed into their tubular mountings and are easily turned up or down to permit of their accurate adjustment. The cardioid ultramicroscope is restricted t
. Elementary chemical microscopy. Microscopy; Microchemistry. 120 ELEMENTARY CHEMICAL MICROSCOPY In the absence of an arc lamp use a 400-watt Mazda lamp with concentrated filament. Or if gas alone is available, employ an inverted Welsbach incandescent mantle or even better an acetylene light. Be sure that the reflecting condenser is high enough in its mounting to just touch the object cell upon the stage. Substage ultracondensers are usually screwed into their tubular mountings and are easily turned up or down to permit of their accurate adjustment. The cardioid ultramicroscope is restricted to the study of liquids, to the search for bacteria not readily demonstrated by the paraboloid condenser and to the examination of thin textile fibers, and such other thin semitransparent and flexible solid fragments as will permit pressing out flat, and whose thickness will then be no greater than the thin liquid film of the medium in which they are immersed. t Cotton and Mouton's Ultramicroscope1 consists of a special prism consisting of a rectangular prism of glass having an in- clined face. This prism is laid upon the stage of the microscope and serves for the projection of an oblique beam of light into the preparation placed upon its upper surface. The diagram, Fig. 59, will make clear the construction and the method of using. The prism P, 8 to 10 millimeters high, which converts an ordinary compound microscope into an in- strument for the study of ultra- microscopic particles, rests upon the stage S. The liquid L, to be studied, is placed upon an ordinary glass object slide s and covered with a thin cover glass c. A drop of homogeneous im- mersion oil is placed upon the top of P, and the preparation is 1 Cotton et Mouton, , 136 (1903), 1657; Les Ultramicroscopes, Paris, 1906; J. Roy. Micro. Soc, 1903, 573; Lemanissier, Corps Ultramicroscopiques, These. Paris, 1905, Fig. 59- The Ultramicroscope of Cotton & Please note that these images are extracted fr
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