For sale, a large Victorian porcelain minimum thermometer by Dollond of London.This unusual example measures 12” across and 4” in height on the wall with a graduated edge, porcelain scale plate incorporating two porcelain hanging loops at the top edge. The main painted scale measures -30 to 120 Fahrenheit but has an additional Centigrade scale at the top left above the thermometer to show freezing point and below. It is marked, “scale shewing degrees below freezing”. To the right is written, “Improved Minimum Thermometer” and Dollond, London at the base. The whole is nicely frames with black line edging and with fleur de lys type motifs at each corner.The spirit thermometer has a large angled bulb centred in a hole through the porcelain to ensure air flow and correct temperature readings unhindered by the temperature of the porcelain itself, and it is protected by a brass grill. Two further thermometer clips ensure that the thermometer is held against the scale at either end. G...