Chemical News and Journal of Industrial Science . particular tap, and is sometimes troublesome. A. Slator describes another method of altering the mer-cury level (jfoiirn. Soc. Chem. Ind., igii, xxx., 6i) 3 shows the upper part of the regulator, and does notinclude the toluene bulb. The glass rod plunger, A, passesthrough the rubber bung, b, and forces the desired amountof mercury into the stem, k, of the apparatus. The cup, d,is filled to the exclusion of all air by a mixture of about twoparts glycerin and one of water. The bung, b, rests onthe cup, and is held in position by the rubber
Chemical News and Journal of Industrial Science . particular tap, and is sometimes troublesome. A. Slator describes another method of altering the mer-cury level (jfoiirn. Soc. Chem. Ind., igii, xxx., 6i) 3 shows the upper part of the regulator, and does notinclude the toluene bulb. The glass rod plunger, A, passesthrough the rubber bung, b, and forces the desired amountof mercury into the stem, k, of the apparatus. The cup, d,is filled to the exclusion of all air by a mixture of about twoparts glycerin and one of water. The bung, b, rests onthe cup, and is held in position by the rubber tubing, c,which overlaps the bung and the cup. The plungerreadily slides through the bung owing to the efficientlubrication by the glycerin and water, and to the fact thatthe tubing, c, whilst making a tight joint, does not undulycompress the bung. The bend, f, ensures the mercuryremaining in the side piece, even if the level in the stemfalls below the joint, h. By means of this arrangementthe regulator can be adjusted accurately to any desired. Fig. 5. temperature over a wide range of temperatures. It hasalso been noticed that the fragile end, m, of the tube, n, isrendered less liable to breakage if the two are connected bymeans of narrow rubber tubing, E (bicycle valve tubing),instead of being rigidly attached. Electrically controlled Thermostats with Gas Heating.—W. Meyerhoffer described a thermostat in which thebulb of the regulator was filled with mercury {Zeit. , i8go, v., gg). An electrical device was used to cutoff the gas supply by pressure on a rubber tube, wheneverthe circuit was closed by expansion of the mercury. Another electrically controlled thermostat is describedby J. L. R. Morgan (jfoiirn. Am. Chem. Soc, igii, xxxiii.,344), which may be used at any temperature between 0°and go°. The bath liquid is heated or cooled by a regulatedsupply of hotter or colder liquid. It is claimed that thisthermostat is very satisfactory in use. Electricallv Heated
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