Forbes Bath Thermometer The mercury glass thermometer is securely held within the wooden frame by a cork at the flat bottom of the frame. The opposite side of the wooden frame features a handle. The thermometer is made of clear glass, allowing for easy temperature reading on the paper scale, printed in black ink along with the brand "Dr FORBES SPECIFICATIONS." and "Made in Germany". Its tip contains mercury. The cork cannot be removed. These types of thermometers were designed by Forbes and used to measure water temperature for give cold, warm or hot baths as part of medical treatment. 1900-1949