Rosenback Mobil Thermometer. Material: metal, glass, mercury. Size: 3 1/4" W. x 11" H. Description: white enameled metal panel with one hole in top and one hole in bottom for hanging; red painted border with black letters and numerals; stamped: "Rosenback Mobil Bulk Tank Wagon Service Phone 465-8018 New Richland, Minnesota; numerals indicating 60 below zero to 120 above zero with line gradations; "Made in U.S. A. 355"; glass tube holds red tinted mercury which rises and falls with temperature.
