the conical tube a Nicol prism is fixed so that few but important. In chemistry, its most prominent either of its diagonals shall be 45° from the principal the weight of coal it started with by a good many tons. use is in the determination of sugars. In medicine, section of the selenite films. The… … coalare taken from the genuineness of lenses of this class. In the hands of an detecting strains cars every day, orrather WHEATSTONE’S POLAR CLOCK. ‘expert it is undoubtedly valuable, but glass lenses inglass. By opti- every night, as the ope- may be put under strain by heating them and allow-…
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