six's thermometer(redirected from Six's maximum and minimum thermometer)
Six's thermometer[′sik·səz thər‚mäm·əd·ər]
A combination maximum thermometer and minimum thermometer; the tube is shaped in the form of a U with a bulb at either end; one bulb is filled with creosote which expands or contracts with temperature variation, forcing before it a short column of mercury having iron indexes at either end; the indexes remain at the extreme positions reached by the mercury column, thus indicating the maximum and minimum temperatures; the indexes can be reset with the aid of a magnet.
A combination maximum-minimum thermometer. It has a U-shaped glass tube whose bottom half is filled with mercury. The left-hand horn is filled with alcohol, and the right-hand horn is partially filled with alcohol; the remaining portion has a gas above it. A colored glass index contains a thin iron pin in the center on both sides of the tube on top of the mercury. When the temperature increases, the alcohol in the left side expands and forces the mercury and the alcohol column on the right side into the gas chamber. The index in the right-hand tube also rises. When the temperature decreases, the alcohol in the left side contracts and the gas expands, forcing the liquid back into the left side and pushing the index along with it. The indices retain their position, which they achieve when the maximum and minimum temperatures are reached. They are reset with an external magnet.