Mason's Hygrometer with Wet and Dry Bulb, Wall-Mounted Material_Muslin the half-size circulatory model traces

the half-size circulatory model traces arterial and venous pathways from heart to peripheral capillaries

measuring atmospheric pressure via a fluid column mounted on a single-piece frame

and iron rods at 150 by 3mm mounted along a hot-water tank

this 2mm-plug lead pairs a banana plug at one end with a crocodile clip at the other for fine-pitch experimental work

Mason's Hygrometer with Wet and Dry Bulb, Wall-Mounted Material_Muslin the half-size circulatory model tracesWall mounted Mason's hygrometer with two identical dual scale thermometers one dry and one kept wet via a water reservoir calculating relative humidity from their paired reading difference.