Thermoscope is a (glass) weather glass similar to types used in 17th century. Made in 2 parts in our own glass workshops (liquid not supplied - can be simply filled with some coloured water) Is responsive to pressure and temperature change. An unusual simple barometer. Delivery by arrangement.
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A faithful copy of Adies early Sympiesometer - the type Captain FitzRoy took with him on the famous voyage of the Beagle. Originally designed by Alexander Adie of Scotland in 1818. The special usefulness of this type of barometer was for onboard sail ships where normal mercury barometers often broke while swinging in gimbals and the mercury moved up and down more than desired while trying to read when the ship was moving. The level of oil in the sympiesometer moves slowly and very little when leaned over as when on board a ship. As per FitzRoy's days they are not as accurate as mercury barometers and the temperature correction is not so good, another example of early barometer designs that never really took off and have been collectors pieces probably since their invention. Old original ones often command a high price. Several marine mercury barometers even had a sympiesometer attached to them in later years. Some of these still have mercury thermometers which as they are old stock we are allowed to sell still. The operation is as the old ones were, by sliding the moveable scale to register temperature read from the thermometer and a small dial near the base can be rotated to record the reading untill read next time to see any changes. Made by us at Merton - often to order. Delivery by special arrangement only - due to nature of item - none sent overseas.
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A large modern enviromentally friendly liquid barometer from Belgium. This lightly frosted glass backed barometer and thermometer comes with a chrome hanging screw not illustrated. Based on the Aide principle of traping a gas and using oil to show changes, the thermometer helps compensate for temperature changes.

COLLECTION NORMALLY - DELIVERY ONLY BY ARRANGEMENT
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Inspired by reasearch into his many barometer books, our director based this curious instrument on a barometer made by Robert Hooke 1635 - 1703 (of the Royal Society) The Mahogany case surrounds a 17th Century style paper scale with summer and winter predictions. The brass indicator records the level of the oil which is temperature stabalised by our patented vacuum glass. Of inerest to the scientificly minded collector. Only made and sold by us in our workshop. Delivery in UK by special arrangement - collection recommended.
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A modern version of the sympiesometer in mahogany case with thick bowed glass front. The printed paper scales with picture of ship of the Antartic Expedition of 1839 .
Collection advised. delivery by special arrangement
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Collins Patent Table Barometer, a glass barometer originally designed at Merton, the glass tube has an internal glass spiral tube filled with distilled water, which rises and falls with the changing air pressure. These also react to temperature change but if temperature is even then pressure alone will be seen. A modern version of a very primative type of weather indicator. Decorative and curiousity value. Delivery only by arrangement - delicate.
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Weather Glass, hand-blown glass file, mounted with brass fitments, hand finished and lacquered on brown and cream backboard with some interpretations given and mounted in wooden frame (No guarantee that this works!) but a fun item worth experimenting with, where you hang will make a difference to crystal formations.
We have developed the mixture over many years from an original recipe by Negretti and Zambra. No one really understands why the crystalls sometimes change, perhaps electrical tension , certainly temperature makes a difference. Originally hung outside these examples are for indoor use, near a window, on an outside wall or in an entrance hall etc.
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Narrow Thunder bottle, possibly the oldest barometer known to man. Each barometer is hand-blown and ready to be filled with water and hung up in a suitable place - the water can spill out of the spout when stormy so be careful where you hang it! These also react to temperature change but if temperature is even then pressure alone will be seen. Made from soda glass, suggested to hang with suitable string through glass loop. Filled with coloured water which some anti bacterial fluid can be added to hinder mould growths. Distilled water advised.
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