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Fowler & Co. Double Sided Artillary Calculator
lot 251 (Photographs, Optical Toys & Science, 12th May, 2026)
English, 1st WW, the face marked for 'FOWLER & CO MANCHESTER, ARTILLERY CALCULATOR', the wite metal body stamped 1990, 2 control knobs, in original ... read more
Sold for £200 Result including buyers premium More details 4
G. F. Wilson, Silver Lords Calculator
lot 252 (Photographs, Optical Toys & Science, 12th May, 2026)
English, marks for London 1895, the face marked for 'LORDS PATENT W. WILSON LONDON' with 3 control knobs,
Sold for £212 Result including buyers premium More details 5
Edward Wilsons 'Pocket Watch' Slide Rule
lot 253 (Photographs, Optical Toys & Science, 12th May, 2026)
English, c.1903, face marked for 'PATENT SLIDE RULE CALCULATOR, EDW'D WILSON ENGINEER EXETER', double sided calculator mounted in white metal, ... read more
Sold for £500 Result including buyers premium More details 5
Early First Form, Fowler's Calculator
lot 254 (Photographs, Optical Toys & Science, 12th May, 2026)
English, c.1890, unsigned but by Fuller, with instruction booklet for 'The Fuller Calculator', serial number 822, early form with French polished ... read more
Sold for £400 Result including buyers premium More details 10
Fuller's Calculator, With Scale of Sines & Logs
lot 255 (Photographs, Optical Toys & Science, 12th May, 2026)
English, dated from the serial number 1936, the outer sleeve marked for 'FULLER'S SPIRAL SLIDE RULE', with mahogany handle and top, Phenolic Resin ... read more
Sold for £250 Result including buyers premium More details 7
lot 256 (Photographs, Optical Toys & Science, 12th May, 2026)
English, serial no. for 1922, Stanley, spiral slide rule with inner cylinder with a scale of sines of angles, brass tube, in mahogany case with ... read more
Sold for £212 Result including buyers premium More details 6
Stanley & Co, Fuller Calculator
lot 257 (Photographs, Optical Toys & Science, 12th May, 2026)
English, serial no. for 1941, Stanley, spiral slide rule with inner cylinder with a scale of sines of angles, PolyPhenol tube, in mahogany case with ... read more
Sold for £225 Result including buyers premium More details 6
lot 258 (Photographs, Optical Toys & Science, 12th May, 2026)
English, serial no. for 1951, Stanley, spiral slide rule with inner cylinder with a scale of sines of angles, phenolic resin tube, in mahogany case ... read more
Sold for £350 Result including buyers premium More details 7
lot 259 (Photographs, Optical Toys & Science, 12th May, 2026)
dated September 1953, curta calculator, in metal case, in original card case with instructions & Guarantee card Condition: cosmetically good with ... read more
Sold for £975 Result including buyers premium More details 8
lot 260 (Photographs, Optical Toys & Science, 12th May, 2026)
English, c.1910, stamped to the front 'Stanley, London, Trade Mark' with original instruction booklet, in the original case, case 28cm wide
Sold for £350 Result including buyers premium More details 11
C. T Cooper & Sons, Baines Slide Rule
lot 261 (Photographs, Optical Toys & Science, 12th May, 2026)
English, c.1900, stamped to the side 'C. T. Cooper & Sons, London' constructed of polished boxwood, with scales for 'Flamants Formula for cast iron ... read more
Sold for £350 Result including buyers premium More details 6
An Early 18th Century Late Stuart, Textile Ell Measure
lot 262 (Photographs, Optical Toys & Science, 12th May, 2026)
English, dated 1705 and stamped 'WW' the with scales engraved to each of the 4 sides, top turned as a handle with damage and loss to the end tip, ... read more
Sold for £438 Result including buyers premium More details 7
lot 263 (Photographs, Optical Toys & Science, 12th May, 2026)
English, c.1880, stamped along the top edge 'LORD'S COTTON CLOTH COSTER', constructed in the form of a 19th century writting slope, with a ... read more
Sold for £262 Result including buyers premium More details 8
B. J. Hall & Co. Computing Scale
lot 264 (Photographs, Optical Toys & Science, 12th May, 2026)
English, c.1900, stamped along the bottom of the rule 'B. J. HALL & CO LTD, LONDON & BIRMINGHAM', lift out sale holder with sliding German Silver ... read more
Sold for £150 Result including buyers premium More details 5
Holtzapffel & Co. Proportional Dividers
lot 265 (Photographs, Optical Toys & Science, 12th May, 2026)
English, c.1880, the case with gilt trade label for 'HOLTZAPFFEL & Co, 64 CHARING CROSS LONDON' to lid of leather covered case, the dividers ... read more
Sold for £88 Result including buyers premium More details 5
Messer, Unusually Small Pantograph
lot 266 (Photographs, Optical Toys & Science, 12th May, 2026)
English, c.1800, engraved in copperplate 'Mefser London' to one of the brass arms, of typical construction, with lead weight, pencil holder and point, ... read more
Sold for £275 Result including buyers premium More details 6
lot 267 (Photographs, Optical Toys & Science, 12th May, 2026)
English, c.1770, engraved in copperplate 'B Martin London', brass engraved protractor, with scales to the front and verso, 15.7cm wide Note: dings ... read more
Sold for £325 Result including buyers premium More details 3
Adams, A Fine Set of Gunners Calipers
lot 268 (Photographs, Optical Toys & Science, 12th May, 2026)
English, c.1800, engraved 'Adams London', the brass calipers with steel tips further engraved 'Brafs Guns, Proof Service', 'Iron Guns Proof Service', ... read more
Sold for £2,250 Result including buyers premium More details 5
lot 269 (Photographs, Optical Toys & Science, 12th May, 2026)
English, c.1815, engraved 'Farey, London No.21', sliding brass lacquered frames with rack and pinion adjustment to circular frames, with brass ... read more
Sold for £3,625 Result including buyers premium More details 4
A Large & Complex Victorian Ellipsograph
lot 270 (Photographs, Optical Toys & Science, 12th May, 2026)
English, c.1880, unsigned, large geared 30cm ring with internal silvered scale with gearing, with internal sliding circular 'Farey-Pattern' ... read more
Sold for £2,000 Result including buyers premium More details 5
2 19th Century Swing Arm Protractors
lot 271 (Photographs, Optical Toys & Science, 12th May, 2026)
including and example engraved 'Schmalcalder, 82 Strand, London' with geared adjustment, in shaped French polished mahogany case, case 16.5cm wide; ... read more
Sold for £225 Result including buyers premium More details 8
A Very Large Set of Archimedian- Type Elliptical Tramels
lot 272 (Photographs, Optical Toys & Science, 12th May, 2026)
English, c.1890, unsigned, large French polished light oak case containing 2 Archimedean-Type elliptical Tramels, with 2 supports and 1 steel point, ... read more
Sold for £150 Result including buyers premium More details 3
2 19th Century Swing Arm Protractors
lot 273 (Photographs, Optical Toys & Science, 12th May, 2026)
including, an example engraved 'Troughton & Simms, london', with geared adjustment, sprung swing arms, in a shaped French polished mahogany case, ... read more
Sold for £275 Result including buyers premium More details 8
2 Large 19th Century Swing Arm Protractors
lot 274 (Photographs, Optical Toys & Science, 12th May, 2026)
including, an example engraved 'Dancer Manchester', with geared adjustment, spring fold out arms in a French polished case, circle diameter 23.5cm; ... read more
Sold for £312 Result including buyers premium More details 6
An Early Set of Bone & Brass Compass Pens
lot 275 (Photographs, Optical Toys & Science, 12th May, 2026)
European, 19th Century, unmarked sprung dividers with bone legs (old crack possibly glued) , brass spring top, screw adjustment and screw adjustment ... read more
Estimated at £50 - £100 More details 3
An Important Map Measuring Instrument
lot 276 (Photographs, Optical Toys & Science, 12th May, 2026)
(i) English, dated 1845, engraved with 2 signatures, the first around the hub of the wheel 'Brookes's Meter' to one side and 'Registered 3 Sept. 1845' ... read more
Sold for £1,375 Result including buyers premium More details 9
lot 277 (Photographs, Optical Toys & Science, 12th May, 2026)
Including 4 sets of folding soverign scales with paper labels for 'A Wilkinson, Ormskirk, Lancashire', a smaller set with a paper label for 'A ... read more
Sold for £3,750 Result including buyers premium More details 14
W & S Jones, Equal-Arm Hydrostatic Balance
lot 278 (Photographs, Optical Toys & Science, 12th May, 2026)
English, c.1800, engraved to the pillar 'W & S JONES 30 HOLBORN LONDON', with extensive manuscript instructions, the scale fitted into a mahogany ... read more
Sold for £2,750 Result including buyers premium More details 8
Edmund Culpeper, Gunter Type Brass Rule
lot 279 (Photographs, Optical Toys & Science, 12th May, 2026)
English, dated 1696, engraved 'Edm: Culpeper Fecit 1696', the heavy gauge brass rule engraved with scales to the front and side with inches along the ... read more
Sold for £1,625 Result including buyers premium More details 5
lot 280 (Photographs, Optical Toys & Science, 12th May, 2026)
English, c.1790, engraved in copper plate 'W & S Jones, No.30 Holborn London', constructed of boxwood, brass pins to scales, brass hinge, scales to ... read more
Sold for £900 Result including buyers premium More details 6
An Important Slide Rule By Dr. Roget
lot 281 (Photographs, Optical Toys & Science, 12th May, 2026)
English, c.1814, engraved to the back 'Dr. Roget Sec:R.S.Inv'* and 'Rooker London' constructed in brass with engraved scales to the front and single ... read more
Sold for £5,000 Result including buyers premium More details 5
lot 282 (Photographs, Optical Toys & Science, 12th May, 2026)
English, c.1720, engraved 'B Scott Fecit', constructed of brass with scales to both sides of one edge, with shaped ends, long side 30cm
Sold for £625 Result including buyers premium More details 5
19th Century Comparative Measures Rule or International Measures Rule
lot 283 (Photographs, Optical Toys & Science, 12th May, 2026)
English, c.1860, stamped 'F. T. Hudson, Optician, Greenwich', the boxwood rule with the English inch along the base to both sides with an array of ... read more
Sold for £812 Result including buyers premium More details 5
Benjamin Scott, Brass Gunter Type Rule
lot 284 (Photographs, Optical Toys & Science, 12th May, 2026)
English, c.1730, engraved in large text ''B Scott Fecit', constructed of brass with Num, Tan & Sin scales to the back and scales to the top, 4mm
Sold for £625 Result including buyers premium More details 5
lot 285 (Photographs, Optical Toys & Science, 12th May, 2026)
the first, English, c.1800, unnamed, engraved scales for chordes, sec, lines, tan & sin, with brass hinge, arms 30cm 1.1cm thick; and another similar
Sold for £688 Result including buyers premium More details 6
A Roberts Sliding Gunter Rule, W & S Jones, London
lot 286 (Photographs, Optical Toys & Science, 12th May, 2026)
English, c.1800, stamped 'W & S JONES 30 HOLBORN, LONDON', constructed of 2 fixed boxwood scales with a sliding scale between the 2 brass mounts at ... read more
Sold for £5,000 Result including buyers premium More details 10
Collection of 3 English Brass Sectors
lot 287 (Photographs, Optical Toys & Science, 12th May, 2026)
comprising of 3 brass sectors signed 'T Wright Fecit', 'J Watkins London', and 'Dollond & Son, London'
Sold for £725 Result including buyers premium More details 6
lot 288 (Photographs, Optical Toys & Science, 12th May, 2026)
English, c.1800, unsinged, engraved with scales to both sides and to the edges, engraved to one side with alchemical symbols, constructed of heavy ... read more
Sold for £650 Result including buyers premium More details 3
A Roberts Sliding Gunter Rule, Nairne & Blunt, London
lot 289 (Photographs, Optical Toys & Science, 12th May, 2026)
English, c.1780, stamped 'NAIRNE & BLUNT, LONDON' with a roped anchor symbol above, constructed of 2 fixed boxwood scales with a sliding scale ... read more
Sold for £8,750 Result including buyers premium More details 7
12" John Brown Sector Quadrant
lot 290 (Photographs, Optical Toys & Science, 12th May, 2026)
English, c.1680, attributed toJohn Brown, boxwood folding sector type quadrant, boxwood arms with square peg brass hinge, scales engraved to all ... read more
Sold for £3,000 Result including buyers premium More details 6
Thomas Heath, London Boxwood Sector
lot 291 (Photographs, Optical Toys & Science, 12th May, 2026)
English, c.1740, engraved in lage lettering 'T HEATH LONDON', constructed of heavy guage box wood with brass hinge, with scales engraved to both ... read more
Sold for £375 Result including buyers premium More details 8
lot 292 (Photographs, Optical Toys & Science, 12th May, 2026)
English, mid 19th Century, stamped 'DRING & FAGE, MAKERS, No.248 TOOLEY STREET LONDON BRIDGE', with 4 boxwood sliders, length 30cm
Sold for £106 Result including buyers premium More details 7
W & S Jones, A Rare & Important 24" Soho Scale Rule
lot 293 (Photographs, Optical Toys & Science, 12th May, 2026)
English, c.1800, marked ‘*W & S JONES, 30 HOLBORN LONDON*’, constructed of boxwood with Soho scales engraved to one side, both edges subdivided into ... read more
Sold for £850 Result including buyers premium More details 9
Collection of 4 Weight Calculating Slide Rules
lot 294 (Photographs, Optical Toys & Science, 12th May, 2026)
Including a slide rule stamped ‘MADE ONLY BY ASTON & MANDER 25 OLD COMPTON ST SOHO LONDON’ and ‘DESIGNED & REGISTERED BY C.HOARE FOR IRON’ ... read more
Sold for £162 Result including buyers premium More details 19
Froude's Ship Displacement Slide Rule by Stanley
lot 295 (Photographs, Optical Toys & Science, 12th May, 2026)
English, c.1900, in boxwood, single slide, double-sided with brass cursor, conversion formulae to edges, 61.5cm
Sold for £106 Result including buyers premium More details 10
Wollaston Slide Rule of Chemical Equivalents
lot 296 (Photographs, Optical Toys & Science, 12th May, 2026)
English, c.1814, marked to the bottom 'Published by W. Cary 182 Strand Jan 1814', constructed of wood with a printed paper scale to the front with ... read more
Sold for £2,000 Result including buyers premium More details 5
English Chemical Equivalents Slide Rule after Wollaston, hydrogen-scale variant
lot 297 (Photographs, Optical Toys & Science, 12th May, 2026)
English, c.1830, unsigned, constructed of boxwood with brass ends, engraved scale to the front based on Wollaston's Chemical Equivalent scale, ... read more
Sold for £2,875 Result including buyers premium More details 4
A 9" 4 slider Gaugers Rule, Edward Roberts
lot 298 (Photographs, Optical Toys & Science, 12th May, 2026)
English, late 18th Century, stamped to the body behind the top slider 'EDW'D ROBERTS, Maker in Dove Court in Old Jewery London', with 4 boxwood ... read more
Sold for £88 Result including buyers premium More details 8
Walter Hays, 18" Brass Sector Rule
lot 299 (Photographs, Optical Toys & Science, 12th May, 2026)
English, c.1650, engraved 'Walter Hays Fecit' to the top edge, constructed of heavy gauge brass with engraved scales for Line, Sines, Solids & ... read more
Sold for £1,875 Result including buyers premium More details 6
John Brown, large 18" Sector Type Rule
lot 300 (Photographs, Optical Toys & Science, 12th May, 2026)
English, c.1680, attributed to John Brown, boxwood arms with brass hinge, engraved scales to all sildes with Oughtreds Guage line, arms John Brown ... read more
Sold for £3,250 Result including buyers premium More details 8