122
T H E J O U R N A L OF I N D U S T R I A L A N D E N G I N E E R I N G C H E M I S T R Y .
necessary t o convert the Bunsen into a blast lamp is t o turn on the full force of the gas. An ordinary
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Mar., 1912
for filtering by suction, by which portions of the filtrate or washings may be kept separate. The apparatus is especially serviceable when a large number of filtrations are t o be made, as in the determination of potash in which it is desirable t o keep the excess of platinum chloride solution and alcohol for recovery separate from the ammonium chloride washings. I t consists of a three-way stopcock, a carbon filter, and suction flasks connected as shown. The arm A, a t a distance of 6 cm. from the cock, is bent t o form the “ U , ” F so that it would extend upward and rest in the joint of the cock. The free end of this arm, A, is cut off about 2 cm. above the U,” giving sufficient length to make the connection t o the filter H with the rubber connection G. The filter H may be made secure by binding to the cock with a small copper wire. The arms B and C are bent parallel t o the arm A 3 or 4 cm. from their ends, these en’ds then being passed through rubber stoppers which fit the suction flasks D and E. The suction flasks are connected to the same pump by means of a “Y.” By adjusting the three-holed stopper of the stopcock the filtrate or washings may be directed into either or both flasks as desired. I‘
Xzchst6t ut c
FOR T h e BZast
Lamp
flame can be maintained with the chimney in position, by simply reducing the flow of gas. The best results will be obtained if the nail and staple are kept well within the inner cone of the flame.
CHEMICAL LABORATORY, ALABAMAPOLYTECHNIC INSTITUTE. AUBURN,ALA.
LABORATORY ATLANTIC& GULF PORTLAND CEMENTCo., RAGLAND, ALABAMA.
AN IMPROVEMENT ON THE KJELDAHL DISTILLING APPARATUS.
A CONVENIENT FILTERING APPARATUS. By C. S. WILLIAMS. JR. Received Oct. 28, 1911.
The accompanying diagram shows a n apparatus
By W. L. HADLOCK. Received Nov. 6 . 1911.
The improvement is essentially a movable support for the flasks. As shown in the cut, the flask rests upon a sheet of galvanized iron, in one end of which is a hole t o re-
ceive the flask. This sheet is attached, by means of two stove bolts, t o a framework of heavy galvanized iron wire (No. 4, B. & S. gauge). The framework makes one turn around a three-quarter inch pipe and
