England Early 1900 Brass Galvanometer Antique Physic Measuring Instrument

Vertical mirror galvanometer made in 1850 circa, oak and glass, three adjustable screws at the base. Tool constituted by a magnet bar movable inside a coil and connected to a needle. In the absence of current the needle is positioned vertically while when the coil is crossed by the current it creates a magnetic field that moves the needle. This type of galvanometer was used for measurement of insulation of telegraph cables...

Large spirit level made of wood, brass and glass manufactured in the second half of the nineteenth century. Excellent condition fully functional. Measures: Length 35.5 cm, width 4 cm...

La Filotecnica Ing A. Salmoiraghi Milan Centesimal tacheometer 133 b normal N. 55858 Catasto Italiano model of the second half of the 19th century, of burnished brass, complete with ...

Induction coil by Du Bois Reymond, also known as Sled of the Du Bois Reymond system designed around 1870 during electrophysiology studies by Emil Du Boi...

Land-surveyor squaring, measuring instrument made of brass, Italian manufacture, from the second half of the 19th century, complete with original walnut box. It is a topographic inst...

Sand hourglass, brass container with circular base and tapered columns in the center and blown glass cruet. Duration 45 minutes. English manufacture of the early 1900s. Measures height 20 cm, diameter 11.5 cm – 7.9x4.5 inches. Shipping is insured by Lloyd's London; our gift box is free (look at the last picture). In Greece, the use of hourglasses was introduced in 325 BC, in the form of stone containers with a truncated cone shape that let water flow out of a hole in the bottom at a constant rate. Other hourglasses were cylindrical or cup-shaped and were slowly filled by a constant flow of water. Some signs on the inner surface of the container indicated the passage of hours as the liquid level rose. Another version consisted of a metal container with a hole in the bottom which, placed to float in a larger container, sank in a given time. This system remained in use until the 20th century in North Africa. These clocks were typically used at night, but not during the day, when the more accurate sundials were available. In the first half of the III century BC. Ctesibius transformed the hourglass into the more complex water clock. Various mechanisms were introduced by him and others to increase the precision of the watch by regulating the pressure and keeping the flow of water constant, but also to offer a better display of the time. The most advanced specimens could ring bells or gongs, open windows to display images, or had movable indicators, dials or representations of celestial bodies. Among the designers of watches...

Beautiful brass frog game set very nice They are the pieces of the popular frog game These originally would be mounted on a piece of furniture, but it is...

The antique antler smoking desk set is made of original antlers from the deer and the stag. It was in Germany, circa 1900. Measures: Width 16.93" (43cm) Height 11.42" (29cm) Antle...

An unusual antique brass table vesta or nib holder decorated with a novelty black enamel figure of a boy diving on the ground dating from the 19th ...

This is an antique apothecary bottle stand. An English, Air Ministry stamped stand dating to the early 20th century, circa 1920. A rare su...

Very large and decorative Hollywood Regency 1920s page turner or letter opener made by hand out of a curl goat Horn and brass. On the brass it reads: AER But the some letters are h...

Antique Victorian Brass and Scottish Agate Postal scale with Weights, Circa 1865-1870.