Jolly-s-Bulb-&-Gauge-RVFM-52-2670-With-a-glass-Jolly-s-bulb-connected-to-a-Bourdon-gauge-this-kit-can-be-used-to-investigate-the-relationship-between-temperature-&-pressure-at-a-constant-volume-By-placing-the-bulb-into-either-hot-or-cold-water-the-effects-of-changes-in-pressure-within-the-sealed-unit-can-be-measured-using-the-gauge-RVFM-Jolly-s-Bulb-Gauge