. Bulletin . BUREAU OF MINES BULLETIN 197 PLATE VIII. APPARATUS FOR FRACTIONATION OF NATURAL GAS AT LOW TEMPERA-TURES AND PRESSURES ANALYSIS OF MINE ATMOSPHERES 75 The other model, the short or portable type, in employed for theanalysis of gas mixtures when extreme accuracy is not required. Itsaccuracy is about to per cent and is comparable with thatusually obtained in technical gas analysis when water is employedas the confining fluid. Both instruments depend upon the sameprinciple. The short model is constructed witli a view to portability,When in position it is upright, about 10 cm.
. Bulletin . BUREAU OF MINES BULLETIN 197 PLATE VIII. APPARATUS FOR FRACTIONATION OF NATURAL GAS AT LOW TEMPERA-TURES AND PRESSURES ANALYSIS OF MINE ATMOSPHERES 75 The other model, the short or portable type, in employed for theanalysis of gas mixtures when extreme accuracy is not required. Itsaccuracy is about to per cent and is comparable with thatusually obtained in technical gas analysis when water is employedas the confining fluid. Both instruments depend upon the sameprinciple. The short model is constructed witli a view to portability,When in position it is upright, about 10 cm. in diameter and 50 , and weighs about 11 pounds. DESCRIPTIOIvr OF LABORATORY TYPE Figure 25 illustrates the principle of operation of the laboratorytype. The pencil of parallel rays which comes from the light of aXernst lamp passes through the object glass of the collimator c andtravels in three parts to the observation telescope d. The upper <^^
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectminesandmineralresou
