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AN APPLIANCE TO DEMONSTRATE BOYLE’S LAW

Number in the past inventory 3077

Number in the current inventory 307

INSTRUMENT: AN APPLIANCE TO DEMONSTRATE BOYLE’S LAW

Age: beginning of the twentieth century

Creator:/

Materials: Wood, cast iron, mercury, glass, brass, iron

Size: (1170 x 260 x 25) mm

State of preservation: Good

Information: From the information contained in the old inventory register, found in the school, the instrument is said to have been added to the inventory with the number 3077 on 10th March 1924 priced at 9,450 liras.

Description: A rectangular wooden base set upright on a cast iron tripod. On the base there are two glass tubes of different lengths and two wooden metrics bars. The short side ends with a tap and a spout, instead the long side ends with a security bubble. The two pipes underneath are inserted in a metal tube with fittings. This tube is closed by another tap with a spout.

Use: Mercury is poured into the tube so that initially its level and the zero line marked on the scales correspond. In the closed side a certain quantity of air at atmospheric pressure will remain confined. After adding some mercury in order to reduce in half the air volume, we measure the difference in the level between the two tubes and this will give the measure of the pressure. More specifically, doubling the pressure the volume will be reduced by a half.

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