When measuring deliquescent crystals one is often forced to work in an atmosphere free from moisture for a considerable length of time. The following is a description of a moisture free chamber which has been used successfully in this laboratory. It consists of a galvanized iron box, Fig. 1, 40 cm. long, 30 cm. wide, and 24 cm. deep with glass windows in the top and front. The cover C, Fig. 2, fits down into the groove B, in the bottom of which is a piece of rubber tubing and when forced down by the pressure of the clamps as shown in Fig. 1, it makes an airtight connection. In each end of the box are holes 12 cm. in diameter thru which the arms are inserted. Rubber sleeves 30 cm. in length and 8 cm. in diameter at the smaller end are here attached.

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