Fowler & Co. Double Sided Artillary Calculator

Lot 251 (Photographs, Optical Toys & Science)

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

G. F. Wilson, Silver Lords Calculator

Lot 252 (Photographs, Optical Toys & Science)

English, marks for London 1895, the face marked for 'LORDS PATENT W. WILSON LONDON' with 3 control knobs,

Edward Wilsons 'Pocket Watch' Slide Rule

Lot 253 (Photographs, Optical Toys & Science)

English, c.1903, face marked for 'PATENT SLIDE RULE CALCULATOR, EDW'D WILSON ENGINEER EXETER', double sided calculator mounted in white metal, ... read more

Early First Form, Fowler's Calculator

Lot 254 (Photographs, Optical Toys & Science)

English, c.1890, unsigned but by Fuller, with instruction booklet for 'The Fuller Calculator', serial number 822, early form with French polished ... read more

Fuller's Calculator, With Scale of Sines & Logs

Lot 255 (Photographs, Optical Toys & Science)

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

Fuller's Calculator

Lot 256 (Photographs, Optical Toys & Science)

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

Stanley & Co, Fuller Calculator

Lot 257 (Photographs, Optical Toys & Science)

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

Bakelite Fuller's Calculator

Lot 258 (Photographs, Optical Toys & Science)

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

Curta II Calculator

Lot 259 (Photographs, Optical Toys & Science)

dated September 1953, curta calculator, in metal case, in original card case with instructions & Guarantee card Condition: cosmetically good with ... read more

Stanley 100-inch Slide Rule

Lot 260 (Photographs, Optical Toys & Science)

English, c.1910, stamped to the front 'Stanley, London, Trade Mark' with original instruction booklet, in the original case, case 28cm wide

C. T Cooper & Sons, Baines Slide Rule

Lot 261 (Photographs, Optical Toys & Science)

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

An Early 18th Century Late Stuart, Textile Ell Measure

Lot 262 (Photographs, Optical Toys & Science)

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

Lord's Cotton Cloth Coster

Lot 263 (Photographs, Optical Toys & Science)

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

B. J. Hall & Co. Computing Scale

Lot 264 (Photographs, Optical Toys & Science)

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

Holtzapffel & Co. Proportional Dividers

Lot 265 (Photographs, Optical Toys & Science)

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

Messer, Unusually Small Pantograph

Lot 266 (Photographs, Optical Toys & Science)

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

B. Martin, Protractor

Lot 267 (Photographs, Optical Toys & Science)

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

Adams, A Fine Set of Gunners Calipers

Lot 268 (Photographs, Optical Toys & Science)

English, c.1800, engraved 'Adams London', the brass calipers with steel tips further engraved 'Brafs Guns, Proof Service', 'Iron Guns Proof Service', ... read more

Farey Ellipsograph

Lot 269 (Photographs, Optical Toys & Science)

English, c.1815, engraved 'Farey, London No.21', sliding brass lacquered frames with rack and pinion adjustment to circular frames, with brass ... read more

A Large & Complex Victorian Ellipsograph

Lot 270 (Photographs, Optical Toys & Science)

English, c.1880, unsigned, large geared 30cm ring with internal silvered scale with gearing, with internal sliding circular 'Farey-Pattern' ... read more

2 19th Century Swing Arm Protractors

Lot 271 (Photographs, Optical Toys & Science)

including and example engraved 'Schmalcalder, 82 Strand, London' with geared adjustment, in shaped French polished mahogany case, case 16.5cm wide; ... read more

A Very Large Set of Archimedian- Type Elliptical Tramels

Lot 272 (Photographs, Optical Toys & Science)

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

2 19th Century Swing Arm Protractors

Lot 273 (Photographs, Optical Toys & Science)

including, an example engraved 'Troughton & Simms, london', with geared adjustment, sprung swing arms, in a shaped French polished mahogany case, ... read more

2 Large 19th Century Swing Arm Protractors

Lot 274 (Photographs, Optical Toys & Science)

including, an example engraved 'Dancer Manchester', with geared adjustment, spring fold out arms in a French polished case, circle diameter 23.5cm; ... read more

An Early Set of Bone & Brass Compass Pens

Lot 275 (Photographs, Optical Toys & Science)

European, 19th Century, unmarked sprung dividers with bone legs (old crack possibly glued) , brass spring top, screw adjustment and screw adjustment ... read more

An Important Map Measuring Instrument

Lot 276 (Photographs, Optical Toys & Science)

(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

Collection of Scales

Lot 277 (Photographs, Optical Toys & Science)

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

W & S Jones, Equal-Arm Hydrostatic Balance

Lot 278 (Photographs, Optical Toys & Science)

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

Edmund Culpeper, Gunter Type Brass Rule

Lot 279 (Photographs, Optical Toys & Science)

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

W & S Jones, Large Sector

Lot 280 (Photographs, Optical Toys & Science)

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

An Important Slide Rule By Dr. Roget

Lot 281 (Photographs, Optical Toys & Science)

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

B. Scott Brass Square

Lot 282 (Photographs, Optical Toys & Science)

English, c.1720, engraved 'B Scott Fecit', constructed of brass with scales to both sides of one edge, with shaped ends, long side 30cm

19th Century Comparative Measures Rule or International Measures Rule

Lot 283 (Photographs, Optical Toys & Science)

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

Benjamin Scott, Brass Gunter Type Rule

Lot 284 (Photographs, Optical Toys & Science)

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

2 Large Boxwood Sectors

Lot 285 (Photographs, Optical Toys & Science)

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

A Roberts Sliding Gunter Rule, W & S Jones, London

Lot 286 (Photographs, Optical Toys & Science)

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

Collection of 3 English Brass Sectors

Lot 287 (Photographs, Optical Toys & Science)

comprising of 3 brass sectors signed 'T Wright Fecit', 'J Watkins London', and 'Dollond & Son, London'

Large 9" Brass Sector

Lot 288 (Photographs, Optical Toys & Science)

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

A Roberts Sliding Gunter Rule, Nairne & Blunt, London

Lot 289 (Photographs, Optical Toys & Science)

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

12" John Brown Sector Quadrant

Lot 290 (Photographs, Optical Toys & Science)

English, c.1680, attributed toJohn Brown, boxwood folding sector type quadrant, boxwood arms with square peg brass hinge, scales engraved to all ... read more

Thomas Heath, London Boxwood Sector

Lot 291 (Photographs, Optical Toys & Science)

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

4 Slide Guager Slide Rule

Lot 292 (Photographs, Optical Toys & Science)

English, mid 19th Century, stamped 'DRING & FAGE, MAKERS, No.248 TOOLEY STREET LONDON BRIDGE', with 4 boxwood sliders, length 30cm

W & S Jones, A Rare & Important 24" Soho Scale Rule

Lot 293 (Photographs, Optical Toys & Science)

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

Collection of 4 Weight Calculating Slide Rules

Lot 294 (Photographs, Optical Toys & Science)

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

Froude's Ship Displacement Slide Rule by Stanley

Lot 295 (Photographs, Optical Toys & Science)

English, c.1900, in boxwood, single slide, double-sided with brass cursor, conversion formulae to edges, 61.5cm

Wollaston Slide Rule of Chemical Equivalents

Lot 296 (Photographs, Optical Toys & Science)

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

English Chemical Equivalents Slide Rule after Wollaston, hydrogen-scale variant

Lot 297 (Photographs, Optical Toys & Science)

English, c.1830, unsigned, constructed of boxwood with brass ends, engraved scale to the front based on Wollaston's Chemical Equivalent scale, ... read more

A 9" 4 slider Guagers Rule, Edward Roberts

Lot 298 (Photographs, Optical Toys & Science)

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

Walter Hays, 18" Brass Sector Rule

Lot 299 (Photographs, Optical Toys & Science)

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

John Brown, large 18" Sector Type Rule

Lot 300 (Photographs, Optical Toys & Science)

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