Analytical Methods for Coal and Coal Products. Volume I by Clarence Karr, Jr. (Eds.)

By Clarence Karr, Jr. (Eds.)

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2. 47 The Reflectance of Coal Fig. 13 1. A Leitz M PV2 ph otom eter incorporating an O rthoplan m icroscope. Light Source High power lamps should be used to obtain a satisfactory level of intensity from the low reflecting coal macerals. Tungsten filament lamps are adequate, but quartz halogen lamps are now in more general use. A common rating for these lamps is 12 V, 100 W. E — C H AS N I d;' i Fig. 14 Id L C H A S N I B 0 E Quartz Halogen Lamp Collector Lens Heat Absorbing Filter Aperture Diaphragm Half Stop Polarizer Field Diaphragm Berek Prism Objective Magnification System with Limiting Aperture F Interference Filter P Photomultiplier Cathode M Immersion Oil Schem atic diagram of the optical com ponen ts of a m icroscope photom eter.

Orientation, association, and intergranular relationships are all taken into consideration. The differences in shape and size of macerals, par­ ticularly sporinite, and maceral associations suggest changes in vegeta­ tion and plant assemblages in the swamp, and consequently differences and changes in the sedimentary environments in the peat swamps. Ting used primarily thin section techniques, although it is conceivable that reflected light techniques can also be employed. Readers are advised to review the previously mentioned and relevant publications for details of thin section techniques.

Abstr. Int. Meeting Geol. Assoc. Canada, Mineral. Assoc. Canada, Mineral. Soc. , Assoc, de L'etude Geol. des Zones Profondes de L'ecore Terrestre, Kingston pp. 95-96 . Ting, F. T. C. (1969). Abstr. Geol. Soc. Am. Annu. Meeting, Atlantic City, p. 225. Ting, F. T. C. (1972). In "D ep o sitio n a l E nvironm ents of the L ig n ite-Bearin g Strata in Western North D ak o ta " (F. T. C. ), pp. 63 -6 8 . North Dakota Geol. Surv. M S 50. T ing, F. T. C. (1977). Palynology 1, 2 7 - 3 2 . Ting, F. T. , and Lo, H.

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