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lot 301 (Photographs, Optical Toys & Science, 12th May, 2026)
English, early 19th Century, stamped C. Blunt No.38 Tavistock St, London, the scale stamped Shots Diamr, Guns Diamr, In Mer, Chords, Latitude, Hours, ... read more
Sold for £94 Result including buyers premium More details 3
Unusual Brass Rule Engraved with Symbols
lot 302 (Photographs, Optical Toys & Science, 12th May, 2026)
English, 18th Century, unsigned, with unusual scales and symbols, with one scale engraved 'Fortification', 326mm long
Sold for £6,500 Result including buyers premium More details 4
19th Century Comparative Measures Rule or International Measures Rule
lot 303 (Photographs, Optical Toys & Science, 12th May, 2026)
English, c.1860, unmarked, the boxwood rule with the Dutch inch along the base array of international measurements above for comparison with a brass ... read more
Sold for £312 Result including buyers premium More details 4
Robert Corson Coggeshall Improved Slide Rule
lot 304 (Photographs, Optical Toys & Science, 12th May, 2026)
English, c.1770, brass plaque embossed 'Robert Corson, Wolverhampton New Inproved Sliding Rule', constructed of box wood with 2 sliding rules, brass ... read more
Sold for £812 Result including buyers premium More details 9
Unusually Small 6" Gaugers Rule, William Lewis
lot 305 (Photographs, Optical Toys & Science, 12th May, 2026)
English, Late 18th Century, stamped behind the top boxwood slide 'Wm Lewis, Maker, No.52 Bow Lane Cheapside London', the rule with 4 sliders, length ... read more
Sold for £250 Result including buyers premium More details 7
Unusual 4 Slide Gauger Rule, Edward Roberts
lot 306 (Photographs, Optical Toys & Science, 12th May, 2026)
English, late 18th Century, stamped to the main body behind the slider 'EDWD ROBERTS Maker, Dove Court Old Jewery, LONDON' with scales to all 4 ... read more
Sold for £500 Result including buyers premium More details 8
Thomas Heath, Brass Sector Rule
lot 307 (Photographs, Optical Toys & Science, 12th May, 2026)
English, c.1740, engraved in large lettering 'T Heath Fecit', constructed of Brass, engraved on both sides with various linear and non-linear scales, ... read more
Sold for £2,125 Result including buyers premium More details 6
18th Century, Boxwood Gunter rule, and other
lot 308 (Photographs, Optical Toys & Science, 12th May, 2026)
English, late 18th century, stamped 'Navigation Scale Improved By B. Down', the boxwood rule with brass compass points, one side engraved the natural ... read more
Sold for £375 Result including buyers premium More details 4
2 Ganga Ramm's Patent Slide Rules By Holtzapffel & Co. London
lot 309 (Photographs, Optical Toys & Science, 12th May, 2026)
English, c.1880, stamped 'Holtzapffel & Co, 64 Charing Cross', the boxwood slide rule with ivory verniers in its original card case with printed ... read more
Sold for £525 Result including buyers premium More details 8
Financial, Compound Interest Slide Rule, Cary
lot 310 (Photographs, Optical Toys & Science, 12th May, 2026)
English, mid 19th Century, stamped 'CARY 181 Strand London', with two logslides, inside scales for Present Worth & Annuity and to the other side ... read more
Sold for £312 Result including buyers premium More details 9
Collection of Alcohol related Slide Rules
lot 311 (Photographs, Optical Toys & Science, 12th May, 2026)
including 2 sliderules for calculating aclohol content of various drinks with brass cursors, a slide rue by J Long London for calculating alcohol ... read more
Sold for £94 Result including buyers premium More details 18
Collection of 19th Century Slide Rules
lot 312 (Photographs, Optical Toys & Science, 12th May, 2026)
including a boxwood scale rule to calculate Belt Velocity, Revolutions Per Minute, Diameters of Pullys in Inches, Horse Power and other scales ... read more
Sold for £250 Result including buyers premium More details 22
A Pair of Evans Paper Makers Rules
lot 313 (Photographs, Optical Toys & Science, 12th May, 2026)
English, c.1880 Paper Makers boxwood Rule stamped 'ASTON & MANDER ltd Makers 61 Late 25 Old Compton St, London, Paper Makers Rule Designed by L.Evans' ... read more
Sold for £100 Result including buyers premium More details 7
lot 314 (Photographs, Optical Toys & Science, 12th May, 2026)
English, c.1800, stamped 'BATE LONDON' brass tips with single slide scales stamped GRIT LINE, GRIT and DIAMETER, length 61cm
Sold for £150 Result including buyers premium More details 5
Boxwood Double Slide Gaugers Rule
lot 315 (Photographs, Optical Toys & Science, 12th May, 2026)
English, c.1800, stamped to the edge 'J STUTSHBURY FECIT DOVE COURT OLD JEWERY LONDON', the rule engraved with scales to only the top face with 2 ... read more
Sold for £188 Result including buyers premium More details 5
2 Boxwood Double Slide Gauger Rules
lot 316 (Photographs, Optical Toys & Science, 12th May, 2026)
English, c.1800, stamped to the back 'BUSS 33 HATTON GARDEN LONDON', the rule engraved with scales to only the top face with 2 boxwood slides, length ... read more
Sold for £150 Result including buyers premium More details 6
A 24" Gaugers Rule, Edward Roberts
lot 317 (Photographs, Optical Toys & Science, 12th May, 2026)
English, late 18th Century, stamped behind the top boxwood slide 'EDWD ROBERTS Maker Dove Court in Old Jewery LONDON' with 3 boxwood slides two with ... read more
Sold for £262 Result including buyers premium More details 7
Routledge Engineer’s Rule, & Another Similar
lot 318 (Photographs, Optical Toys & Science, 12th May, 2026)
English, early 19th Century, stamped along the top edge 'Routledge Engineer’s Rule', constructed of boxwood with logorithmic slide rule to the front, ... read more
Sold for £200 Result including buyers premium More details 6
A 24" Gaugers Rule, Edward Roberts
lot 319 (Photographs, Optical Toys & Science, 12th May, 2026)
English, late 18th Century, stamped behind the top boxwood slide 'EDWD ROBERTS Maker Dove Court in Old Jewery LONDON', owners stamp 'JOHN HAYCOCK ... read more
Sold for £275 Result including buyers premium More details 8
lot 320 (Photographs, Optical Toys & Science, 12th May, 2026)
English, late 18th century, 18" four slide boxwood gaugers rule, stamped behind the top boxwood slide 'EDWD ROBERTS Maker in Dove Court Old Jewery ... read more
Sold for £212 Result including buyers premium More details 7
3 Sided Gaugers Rule, Dring & Fage
lot 321 (Photographs, Optical Toys & Science, 12th May, 2026)
English, mid 19th Century, stamped to the side scale 'DRING & FAGE MAKERS TOOLEY ST LONDON' with scales to 3 slides each with boxwood slide, with ... read more
Sold for £100 Result including buyers premium More details 7
Three Slide Boxwood Gaugers rule
lot 322 (Photographs, Optical Toys & Science, 12th May, 2026)
English, late 18th Century unsigned boxwood Gaugers rule, stamped for scales Root, Square Cube, MD, St, Ly, length 30cm
Sold for £106 Result including buyers premium More details 6
Apparatus, Observation of Fire Slide Rule
lot 323 (Photographs, Optical Toys & Science, 12th May, 2026)
English, c.1914, engraved to one side 'APP OBS OF FIRE SLIDE RULE MKIII' and the the other side 'J. HICKS 8, 9 & 10 HATTON GARDEN LONDON', the slide ... read more
Sold for £262 Result including buyers premium More details 9
lot 324 (Photographs, Optical Toys & Science, 12th May, 2026)
English, c.1880, stamped 'E. PRESTON & SONS BIRMINGHAM' and 'COMPILED BY JAMES HOLMES M.S.A. BURNLEY', boxwood slide rule with brass engraved slide. ... read more
Sold for £175 Result including buyers premium More details 7
S. Coulson Engineer, Slide Rule
lot 325 (Photographs, Optical Toys & Science, 12th May, 2026)
English, c.1830, engraved to one of the brass ends 'Dring & Fage, Makers London' and 'S. Coulson Engineer Redcar', constructed of boxwood with brass ... read more
Sold for £81 Result including buyers premium More details 5
Four-Sided Gauger's Slide Rule, Edward Roberts
lot 326 (Photographs, Optical Toys & Science, 12th May, 2026)
English, c.1800, marked behind a slider 'EDWD ROBERTS Maker Dove Court Old Jewery LONDON', constructed of boxwood with 4 pull out scales, marked for ... read more
Sold for £150 Result including buyers premium More details 9
lot 327 (Photographs, Optical Toys & Science, 12th May, 2026)
English, c.1825, unsigned, constructed of boxwood, hypsometrical slide rule for determining altitude by thermometric observation, the rectangular ... read more
Sold for £125 Result including buyers premium More details 4
Hannyngton's Extended Slide Rule
lot 328 (Photographs, Optical Toys & Science, 12th May, 2026)
English, c.1910, stamped to the rear of the scale 'Designed by Major General Hannington, Aston & Mander Ltd, Makers London' polished wooden baseboard ... read more
Sold for £500 Result including buyers premium More details 5
lot 329 (Photographs, Optical Toys & Science, 12th May, 2026)
English, c.1840, the frame marked in gilt lettering 'WEDGEWOOD'S PATENT NOCTOGRAPH, 9 CORNHILL LONDON', the black leather case opening to reveal a ... read more
Sold for £212 Result including buyers premium More details 7
18th Century24" Boxwood Sector
lot 330 (Photographs, Optical Toys & Science, 12th May, 2026)
English, unsigned but dated 1736 to the inside edge, engraved scales for Tan, St, Polygons, Hou, Lat, IDO, Hor, Cho, with scale engraved down the ... read more
Sold for £125 Result including buyers premium More details 4
Philips Photographic Exposure Meter, Slide Rule
lot 331 (Photographs, Optical Toys & Science, 12th May, 2026)
English, c.1880, stamped 'PHILLIPS@ EXPOSURE METER PROVY PROTD FALLOWFILED WHOLESALE AGENT', constructed of boxwood with 2 boxwood slides, the slide ... read more
Sold for £525 Result including buyers premium More details 6
Collection of 7 19th Century Slide Rules
lot 332 (Photographs, Optical Toys & Science, 12th May, 2026)
including: a 24" boxwood rule stamped 'RAINBRIDGES COLLIERY MANAGERS CALCULATOR', with single boxwood slide and brass cursor; a 8" boxwood rule ... read more
Sold for £438 Result including buyers premium More details 27
24" Logorithmic Scale Rule, Cole
lot 333 (Photographs, Optical Toys & Science, 12th May, 2026)
English, 18th Century, stamped to the body behind the boxwood slide 'COLE MAKER at ye ORRERY in FLEET STREET, LONDON', with single boxwood slider to ... read more
Sold for £100 Result including buyers premium More details 7
Boxwood Folding Railway Engineer’s Rule, Stanley London
lot 334 (Photographs, Optical Toys & Science, 12th May, 2026)
English, mid 19th Century, stamped 'STANLEY LONDON' with scales for Off Sett, Rad in Chs, Super Elevation, speed in miles per hour, and 66 feet chord, ... read more
Sold for £62 Result including buyers premium More details 4
S. Coulson Engineer, Slide Rule
lot 335 (Photographs, Optical Toys & Science, 12th May, 2026)
English, c.1830, engraved to one of the brass ends 'Dring & Fage, Makers London' and 'S. Coulson Engineer Redcar', constructed of boxwood with brass ... read more
Sold for £112 Result including buyers premium More details 6
18th Century Italian Brass Sector
lot 336 (Photographs, Optical Toys & Science, 12th May, 2026)
Italian, dated 1739, engraved 'Dominicus Lusuery F. Rome 1739' with scales to the front engraved Figurarum Regularium, Solidorum, Partium AEqualium, ... read more
Sold for £6,000 Result including buyers premium More details 6
lot 337 (Photographs, Optical Toys & Science, 12th May, 2026)
English, c.1720, engraved 'B. Scott, Fecit', brass sector, scales to both sides engraved Tw, Pol, Cho & Lin, 9" length opened
Sold for £500 Result including buyers premium More details 5
Collection of Early Slide-Ruler Related Books
lot 338 (Photographs, Optical Toys & Science, 12th May, 2026)
Including: 'The Carpenters Rule Made Easy or the Art of Measuring Superfices and Solds, 8th edd, Thomas Haselden, 1727. 'The Art of Practical ... read more
Sold for £250 Result including buyers premium More details 10
Carver, Issac, William and Mary period Ivory Gauger Rule
lot 339 (Photographs, Optical Toys & Science, 12th May, 2026)
English, dated 1689, signed ‘ISSAC CARVER fecit 1689’, constructed of ivory with scales to all 4 sides, with 2 ivory slides with scales engraved to ... read more
Sold for £2,625 Result including buyers premium More details 7
Friedrich Krantz, A Large & Exceptional Collection of Crystal Models
lot 340 (Photographs, Optical Toys & Science, 12th May, 2026)
German, c.1880, many with lables for 'Dr. F. Krantz' each with a number, the models constructed of glass held together with black gummed paper, with ... read more
Sold for £2,625 Result including buyers premium More details 7
Friedrich Krantz, A Large & Exceptional Collection of Crystal Models
lot 341 (Photographs, Optical Toys & Science, 12th May, 2026)
German, c.1880, many with lables for 'Dr. F. Krantz' each with a number, the models constructed of glass held together with black gummed paper, with ... read more
Sold for £2,125 Result including buyers premium More details 12
A Quartz Spectrograph Camera, by Hilger, London
lot 342 (Photographs, Optical Toys & Science, 12th May, 2026)
English, c.1900, unsigned but by Adam Hilger, French polished mahogany body with lacquered brass fittings, with internal prisms, with single ... read more
Sold for £275 Result including buyers premium More details 12
The Life of Sir William Crookes, Signed Copy
lot 343 (Photographs, Optical Toys & Science, 12th May, 2026)
The Life of Sir William Crookes O.M., F.R.S. By E.E. Fournier D'Albe, D.Sc., F. Inst. P. with a forword by Sir Oliver Lodge, First Ed, Published 1923, ... read more
Sold for £200 Result including buyers premium More details 11
William Crookes & John Spiller Manuscript Letters
lot 344 (Photographs, Optical Toys & Science, 12th May, 2026)
A collection of 5 manuscript letters from William Crookes to John Spiller with one letter From Ellen Crookes, William Crookes wife again to John ... read more
Sold for £500 Result including buyers premium More details 10
William Crookes & John Spiller, Photograph & Documents
lot 345 (Photographs, Optical Toys & Science, 12th May, 2026)
including a Carte De Visite of Wiliiam Crookes with manuscript to the back 'John Spiller from his friend William Crookes July 1863, a typed letter ... read more
Sold for £525 Result including buyers premium More details 6
William Crookes & John Spiller, Collotype Photograph & Obituary
lot 346 (Photographs, Optical Toys & Science, 12th May, 2026)
a copy of the obituary of Sir William Crookes dated April 1911 from the British Journal of Photography with a reproduced image of a collotype ... read more
Sold for £250 Result including buyers premium More details 5
lot 347 (Photographs, Optical Toys & Science, 12th May, 2026)
nglish, c. 1880, signed on a plaque to the base F. J. Cox, 26 Ludgate Hill, London, standing on a French polished circular base with lacquered brass ... read more
Sold for £1,062 Result including buyers premium More details 4
Adam, G., An Early D'Arsonval Galvanometer
lot 348 (Photographs, Optical Toys & Science, 12th May, 2026)
French, c.1880, engraved to a brass plaque: 1 pour un volt 1 pour 1/10 de milli amper G. ADAM Constructeur 9 RUE BLAINVILLE Paris the galvanometer ... read more
Sold for £106 Result including buyers premium More details 5
German 19th Century Egg Pattern Globe
lot 349 (Photographs, Optical Toys & Science, 12th May, 2026)
German, late 19th Century, ten printed gores, coloured and lacquered, opens to reveal empty centre, 14cm tall
Sold for £750 Result including buyers premium More details 11
Bretts's Folding Silk Terrestrial Globe
lot 350 (Photographs, Optical Toys & Science, 12th May, 2026)
English, c,1890, the cartouch printed 'By the Queens Royal Letters Patent, Betts's New Portable Terrestrial Globe Compiled from the latest and best ... read more
Sold for £475 Result including buyers premium More details 4