Tabletop Reflector Telescope B. Martin Brass Glass London England 1800

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.

19th Century / 1801 - 1900

Brass geodesy graphometer, signed "Stanley London", with compass whose bottom is engraved with a compass rose indicating the 4 cardinal points and a broken bubble level. It has an inverted double diopter, as a goal for the fixed reference point, in the lower part. Another movable diopter with reading nonius in the fixed goniometer, the latter having a scale from 0 to 180° and from 180° to 0, indicated from 10° to 10°, semi-circular shape. Contained in a walnut box.

Italy, Early XX Century

Early 20th century brass telescope diopter. Alidade composed of a flat rod, called rule, at the ends of which two pinnulae rise hinged; equipped with metric scale, compass, spirit level and distance metric collimator 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.

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

“Richer à Paris” 1806

Gilded brass semi-circular protractor signed and dated "Richer à Paris/1806" that refears to Jean-Francois Richer.

"Franciscu"

Gilded brass leveling square signed "Franciscu".

"Canivet a Paris"

Level and square set with golden brass wire, signed “Canivet a Paris”. On the instrument there are also the inscriptions “6 p de France / Nelle Mesure”.

"Butterfield a Paris"

Leveller set square with plumb line, in gilded brass, signed “Butterfield a Paris”; there also is the inscription "pouces de Roy". Michael Butterfield (1635-1724) was an English watchmaker who moved to Paris around 1663, where he worked at the royal court and was appointed engineer by Louis XIV. He opened a shop of precision instruments, and specialized, in particular, in the production of sundials. Among his main customers is the Tsar Peter the Great, who also visited the workshop in 1717.

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.

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

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