A Curta Type 1 Calculator, Liechtenstein, mid-20th century, No. 76434, the stepped gear-type pocket calculator engraved CURTA to the screw lid, ...

A large collection of microscope specimen slides, English, 19th and 20th centuries, the mahogany case with glazed door, fitted with twenty eight...

A rare brass equinoctial compass dial, probably French, circa 1700, upper outer face with Butterfield style dial with four hour scales, upper in...

A rare Thomas Wright gilt brass mechanical universal equinoctial dial, English, circa 1730, signed Made by T Wright Instrument maker to ye KING,...

A replica orrery, made by Empyrea, London, 1992, based on the Troughton orrery located at the London Science Museum, with gearbox designed by Fr...

A fine Troughton & Simms 3 1/2-inch brass refracting telescope on stand, English, mid 19th century, signed TROUGHTON & SIMMS LONDON, the tube wi...

A brass universal equinoctial ring dial, probably English, dated 1755, of standard format with engraved degree and hour scales, central bridge w...

An early pocket compass, English, 17th century, the pivoted compass card applied with printed rose with thirty two named points, the paper rose ...

A Charot brass theodolite, French, circa 1770, signed Charot en la Cite a Paris, with telescope mounted on index arm with twin vernier scales an...

A gilt brass universal equinoctial ring dial, Northern European, possibly Danish, late 17th century, the central bridge with pinhole sliding ov...

A Johann Martin silvered and gilt brass universal equinoctial crescent ial. German. circa 1710, signed Johann Martin In Augsburg, the base plat...

A James Short 2-inch reflecting telescope on stand, Scottish, dated 1735, signed JAMES SHORT EDINBURGH 1735.9.39., with focusing to the secondar...

A boxwood Gunter's quadrant, English, mid 18th century, of standard design with punched numbers and scales including degree scale along the circ...

A Thomas Heath brass Butterfield-type sundial, English, circa 1730, signed T * Heath LONDON, the oval dial with inset compass rose showing trac...

A Henry Gregory tell-tale compass, English, 18th century, printed Gregory & Wright London, the double sided compass with two printed compass ca...

A fine brass universal equinoctial inclining dial, English, circa 1720, the octagonal dial finely engraved with single chapter ring IIII-XII-VII...

A rare Carter Rand patent military and naval refracting telescope, English, early 19th century, signed 75 C Rands Ptent Made & Sold by Wm Watkins...

A large Butterfield brass horizontal dial, French, circa 1700, signed Butterfield A Paris, with fixed gnomon and hour scale for 48 degrees 3o m...

A silver Butterfield dial, French, circa 1720, signed Butterfield A Paris, the octagonal dial of standard Butterfield type but with dial plate e...

A Pierre Sevin silver pocket horizontal sundial, French, circa 1680, boldly signed Pierre Ceuin A Paris, single latitude oval dial made for 49 ...

A Johann Martin gilt and silvered brass string gnomon sundial, Augsburg, circa 1690, signed Johan Martin in Augspurg, the octagonal dial made f...

A Dollond brass Universal Equinoctial Dial English, mid 19th century, signed Dollond London, with silvered hour scale, compass rose and latitude ...

A Jeremiah and Walter Watkins silver inclining sundial, English, circa 1790, signed J & W Watkins Charing Cross London, calibrated for 60 degre...

A brass box/horizontal sundial, possibly Spanish, 17h century, circular brass box with hinged lid mounted with sundial with folding gnomon, unusua...

A fine gilt brass folding vertical dial with string gnomon, probably German, circa 1600, the dial with five hour scales for 41,44,47, 50 and 53 ...

A fine and rare Nicholas Blondeau gold ring dial, French, circa 1700, signed Nicolaus Blondeau f, the exceptionally well engraved dial with meri...