Salmoiraghi Antique Brass Tacheometer, Surveying Measuring Instrument, 1860

Moving coil brass galvanometer with three-screw base, instrument signed Philip Harris Ltd Birmingham England n. 19402, made in the early 1900, a tool used as a detector of direct cur...

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...

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...

Stick barometer mounted on a mahogany board complete with vernier reading the variation of atmospheric pressure signed by Jesse Ramsden, end of the 18th century. Very good condition...

Figurehead in carved oak depicting a female figure whose body has the shape of a siren, symbol of fertility and protection, with female features in the upper part and fish tail inste...

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...

Rare and genuine 19th century English Victorian brass telescope on tripod stand. Features amazing optics and a large adjustable base with spi...

American mahogany and brass skylight ship binnacle. T.S. and J.D. Negus company was established in 1848 in New York City. They were makers of fine scientific instruments, circa 1848-1900. This highly desirable and maritime instrument is made of carved mahogany with a brass and glass skylight...

Antique oak and brass boat or ship wheel featuring rounded form with turned posts. Measure: 41"11.

Yacht Winch mounted to a rope carved mahogany base. Polished and lacquered. Overall Dimensions: 7"H x 10"D. 10 pounds.

Scale model of the America's Cup yacht "America" of 1851. Scale model with painted hull, scribed deck, cockpit, hatch, etc. Mounted into a glass display case. Overall Dimensions: ...

Solid brass battleship binnacle with gimballed compass. Iron compensating balls are mounted to brackets. Quite heavy. from the US Navy. Torpedo base. Great polish job. Overall dim...