Collins Patent Table Barometer, a glass barometer originally designed by us when at Merton so no spillage during low pressure. The glass tube has an internal glass spiral tube filled with distilled water (not supplied) which rises and falls with the changing air pressure. These also react to temperature change but if temperature is even, then pressure movement alone will be seen. A modern version of a very primitive type of weather indicator. Decorative and curiosity value. Collection by arrangement. Delivery only by special arrangement - Measurements: 200mm x 60mm
