A STOPPER SUBSTITUTE FOR THE VICTOR MEYER OUTER JACKET JUDSON H. ROBER~ON, TREU ~ E R S I TOPYTENNESSEE, KNOXVILLE, TENNESSEE Because of the enlargement a t the bottom and the side tube near the top of the inner tube of the Victor Meyer molecular-weight apparatus, the cork surrounding it and closing the outer jacket is cut ordinarily from circumference to center so that i t may be slipped around the inner tube. With a well-rolled, flexible cork the slit in the wrk may be quite small, leaving a steam vent that is not too large. When the cork becomes old and brittle it cannot be FIGURE1.-BOTslipped around the inner tube without breaking unless To, B, the size of the slit is enlarged. The objection to cuttmg a larger hole in the cork is that i t lowers the &cieucy of jacketing. It is much simpler to close the outer jacket by means of two flat boards properly sawed out to slip, 2.-Top one over the other, around the nGnnE BOARD inner tube. A pair of these will fit large or small jackets equally well. Figures 1 and 2 show a pair of covers which have proved more SatiSfactbty than the conventional cork. A number of these were made from a board of Transite of '/r-inch thickness, which was left over from the construction of a fume hood. In the center of each of these 3'/*-inch squares '/a-inch holes were drilled and a strip '/a-inch wide was sawed out from the side to the center. Figure 3 shows the covers in position. Transite, which is a composition asbestos material, is FIGmE 3.-V,C. TOR MEYERAPPA- dense and does not warp readily. Hence, the boards are heavy and fit tightly over the outer jacket, making D R p an effective cover. At the same time there is ample space for the escape of steam around the inner tube.
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