The London Shop
Negretti and Zambra were amongst the world's greatest instrument makers. Established in 1850 and based in London, they made innovative barometers for Charles Darwin's voyages on the Beagle, particularly designed to withstand the concussion of a ships heavy guns. In 1915 they developed a hand held weather forecaster which required a minimum of information to be input and yet proved to be more than 90% accurate over a twelve hour period. The forecaster quickly became popular with soldiers, explorers and everyone engaged in outdoor activities.

                
                              The Zambretti Forecaster
Recently  the algorithm used for the Zambretti hand held device was written into a computer program and you can now try it out for yourself. Just click on the picture and enter the information. You will need to know the barometric pressure in your area and the pressure trend, (steady, rising or falling), together with the wind direction and the month of the year; thats all!  If you are in Whitby, that information is available on our weather station readout page. The forecast is most accurate when made at 0900 hours. See how you get on.