Thermometers

At times of severo frost many persona not skilied iu the use of thermometers report remarkably low temperatures. These are often duo to the tbermometric liquid having partly evaporated from the main column and condensed at the end of the tube farthest from the bulb, the thermometer then reading just as many degrees too low as there are degrees of spirit at the top of the tube. Good thermometers are just as liable to this error as common ones, and therefore every one using a spirit minimum thermometer must be on the alert. Generally the owner can restore the thermometer without seuding it back to the maker. Grasp the thermometer flrmly, resting a finger on the tube sothat there be no vibration, and, holding the bulb downward, give several strong, pendulous swings. This will usnally seud tho spirits from the top and send the index into the bulb. Stand the thermometer bulb downward for an honr, then reverse it aud very gently shake the index out of the bulb and let it slide to the end of the column, wbeu the