26 SCIENTIFIC LABORATORY SUPPLIES AND EQUIPMENT-NAMELY, CONSISTOMETERS, PYCNOMETERS, GRAVITOMETERS, GAS GRAVITY BALANCES, DEW POINT RECORDERS, COMPRESSIBILITY APPARATUS, CHARCOAL DISTILLATION APPARATUS, VACUUM PUMPS, DEAD WEIGHT GAUGES AND TESTERS, HYDROMETER JARS, PULSAMETERS, SMOKE METERS, MERCURY PURIFIERS, AND COTTONSEED OIL SAMPLERS