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

this parallel-sided copper inner-vessel calorimeter at 3 by 2 inches gives rapid

5V tungsten-filament flash-lamp bulbs with E10 MES screw bases

accepting rods up to three-quarters of an inch for positioning apparatus at any angle

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.