. Elementary chemical microscopy . Fig. 19. Types of Reflecting Condensers for the Study of Ultramicroscopic Particles. in Fig. 14 will disclose that their inclination is considerably greater. For the chemist the ultracondensers are of far more value than simple dark-field The Adjustment of Dark-field Illuminators for use requires close attention, chiefly, to five conditions: (1) a selection of a sufficiently powerful radiant and the projection of a spot of light large enough to completely fill the lower opening of the illuminator; (2) the employment of objectives having a numer
. Elementary chemical microscopy . Fig. 19. Types of Reflecting Condensers for the Study of Ultramicroscopic Particles. in Fig. 14 will disclose that their inclination is considerably greater. For the chemist the ultracondensers are of far more value than simple dark-field The Adjustment of Dark-field Illuminators for use requires close attention, chiefly, to five conditions: (1) a selection of a sufficiently powerful radiant and the projection of a spot of light large enough to completely fill the lower opening of the illuminator; (2) the employment of objectives having a numer- ical aperture never greater than ; (3) the use of object slides of the thickness for which the illuminator has been designed; (4) accurate centering of the illuminator with respect to the 1 Dark-field illuminators are manufactured by the Spencer Lens Co., Buffalo, N. Y., and the Bausch & Lomb Optical Co. of Rochester, N. Y. That made by the latter firm is preferable for the chemist, yielding more brilliant preparations and disclosing the presence of finer colloidal suspensions.
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectmicroscopy, bookyear1
