Protractor - "Langlois in Paris aux Galleries du Louvre"

Hamburg 1837 - 1862

Sextant "D. Filby Hamburg" in ebonized wood, brass and bone, vernier with adjustment screw, three colored filters for the fixed mirror and four for the mobile one, sighting telescope with optics. Contained in a wooden box in mahogany.

19th Century / 1801 - 1900

Telescope diopter made of brass, composed of a movable graduated ruler, small compass with wind rose on the base, distance collimator telescope, vertical graduated circle and spirit level placed on the top of the telescope.

Sextant with brass frame, vernier with adjustment screw, three colored filters for the fixed mirror and three for the mobile one, aiming telescope.

18th Century / 1701 - 1800

Brass alidade for a praetorian tablet, consisting of a flat rod, called a ruler, at the ends of which two pinnules with a pin for locking are hinged. Contained in an original leather and suede case on the inside.

V

Sextant with brass frame, vernier with adjusting screw and microscope for reading, three coloured filters for the fixed mirror, four for the mobile mirror. Marked "P. & G. Mattei Cardiff".

19th Century / 1801 - 1900

Sextant with brass frame, vernier with adjusting screw and microscope for reading, three coloured filters for the fixed mirror, four for the mobile mirror. Marked "P. & G. Mattei Cardiff".

"Troughton London"

Brass theodolite with compass, telescopic sight and spirit level, marked 'Troughton London'. Edward Troughton was one of the best manufacturers of scientific, navigational, surveying and astronomical instruments. Following the death of his eldest brother and partner, he took over from William Simms in 1826 and the name of the firm changed to Troughton & Simms.

19th Century / 1801 - 1900, 18th Century / 1701 - 1800

Gilded brass monocular with extensible bosy; the end is enamelled and decorated with gilded phitomorphic gyrals.

"Baradelle a Paris"

Theodolite in gilded brass, with fixed and movable alidade central compass; signed on the underside "Baradelle a Paris". Baradelle was a French family of makers of scientific instruments; their production includes that of the father Jean-Louis-Jacques (active from 1752 to 1794) and his son Nicholas Eloi (active from 1774 to 1814), both signing indiscriminately with the sole surname. There is the painted and gilded wooden base with phytomorphic motifs as well. A similar theodolite belongs to the English collections of the Science Museum Group.

Fuller's Spiral Slide Rule

Fuller's cylindrical slide rule. It consists of an outer wooden cylinder that slides up and down and rotates, covered with paper marked with a graduated spiral logarithmic scale; inside is a longer wooden cylinder, also covered with paper marked with decimal tables. A brass index is screwed to the top of the neck, a second, longer brass index is screwed to the mahogany base and marked with a scale. The outer sliding cylinder is marked near the top: “FULLERS SPIRAL SLIDE RULE”; at the bottom it's marked: “ENTD. STATS. HALL / STANLEY, Maker, LONDON". The upper part of the long brass index is engraved: 1791 (/) 1903, for which it can be assumed (as for another similar specimen, preserved at the National Museum of American History) that the first is the serial number, while the second the year of completion. George Fuller, professor of civil engineering at Queen's University in Belfast, Ireland, patented this instrument in 1878; the Stanley firm produced about 14,000 Fuller spiral slide rules in nearly a hundred years.