Nauticalia

Atmospheric pressure is the single most important factor in weather forecasting, and greater accuracy in measuring it means better predictions. In this style of barometer, invented by Dutchman Christiaan Huyghens in the 17th century, the scale is 10 times larger than it would be on a conventional mercury tube, making it much easier to read so that even very slight changes in pressure become noticeable. The secret to his "multiplier scale" lay in floating alcohol on mercury, two liquids of very different densities; the only slight disadvantage being that it reads "the wrong way up" (a rise in pressure sees a fall in the indicator column) - hence "contra-barometer".

This authentic working replica has a Huyghens barometer as its centrepiece, alongside a storm bottle and a thermometer. It's supplied workshop-calibrated for locations up to 2000ft, above that you need to adjust it (instructions supplied).

Dark-stained wood case with glass front, measuring 42 x 6.5".

Usual delivery time approx two weeks (please call 0800 975 1805 if more urgent) - sorry no Express service.