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1920's Fowlers Type RX Calculator in original case

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This is one of the rarer models of the Fowlers circular slide rule range.
Patented around 1920 the RX was one of the first range of double sided slide rules that Fowlers made in the first quarter of the 20th century.
Introduced alongside the type R & type H models, it consists of the front dial of each of those and was thought to be a good compromise for both science students and draughtsmen.
The Fowlers RX calculator measures 67mm in diameter not including the stem & ring, and as can be seen from the photos is in good condition.
The card scales are very clean and legible, and the glass is clear with no chips or damage, the serial number 3431 is engraved on the outer edge.
In full working order, it comes with its original nickel plated outer case which although tarnished in places, is in sound condition.

Price Status Code UK P&P Overseas
£180
SC1889 Free £12

1930's Fowlers Vest pocket Long Scale calculator

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A nice clean example of a Fowler's double sided Long Scale calculator, contained in its purple velvet lined nickel plated case with the original Fowlers trademark logo on the inside of the lid.
Known also as a 'Vest pocket' model, these double sided calculators were recommended as the most comprehensive and accurate pocket calculator ever made, and this particular model dates to the 1930's.
In very good condition, it measures 2 1/2" diameter and is in good working order, with very clean scales on both faces.
One side reads 'Fowlers Calculator' and the other 'Fowlers Long Scale Calculator' with the serial number 12344.

Price Status Code UK P&P Overseas
 
SOLD
SC1882    

Otis King Type C model L cylindrical slide rule with helical scales

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This Otis King cylindrical slide rule calculator comes with its' original numbered box & instructions.
A type C model 'L' series, it's one of the last Otis King models produced in 1971/72, which comes with the original post decimalisation 8 page instructions, having the 54 Dundonald Road address printed on the front page.
Made by Carbic Limited London, the patent no is 183723 with scale 429 on the bottom, & 430 on the top.
This particular example is in very good condition with all scales in clean, legible condition and free of any scuff marks, the black and chrome sleeve body is also in fine condition with no paint or plating loss.
In full working order, with the serial number W6904, the helical scales enable numerous mathematical calculations, all detailed in the supplied instructions which although a little fragile are still perfectly readable.

Price Status Code UK P&P Overseas
  SOLD SC1835    
Otis King model K cylindrical slide rule calculator

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A good working example of an Otis King's model 'K' type C cylindrical slide rule calculator with black on white scales.
It carries the serial no A0633 and has very clean & legible helical scales enabling numerous mathematical calculations. The patent no is 183723, with scale 414 on the bottom, & 423 on the top.
Made by Carbic Limited, the 54 Dundonald Road address shows it dates from 1963 onwards, and comes with its original instruction booklet which although a little fragile is still complete.
The chrome plating is in excellent condition as is the black finish on the metal barrel.
Please note that the box is somewhat worn in places and has been previously taped to maintain integrity.

Price Status Code UK P&P Overseas
 
SOLD
SC1860    
Fowlers Universal calculator - prop used in Celebrity Big brother TV show

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This is a rare opportunity to buy a piece of TV memorabilia with this superb condition Fowlers Universal circular calculator in a special blue velvet lined presentation case, which was used as one of the props in the 5th series of Celebrity Big Brother in 2007.
It featured in the Manor House task and was used as an object of interest by the celebrities in the show which included Jermaine Jackson, Shilpa Shetty, Dirk Benedict and the late Jade Goody.
I supplied a number of vintage and antique instruments for the task through my website, of which this was one directly to Endemol the TV company who produced the programme for Channel 4, and this will come with a copy of the hire agreement which is signed by their representative.
In full working order, the six scales perform numerous mathematical functions including multiplication, cube roots and and square roots.
The calculator measures 9cm diameter has a nice clean dial, and all is in very good condition including the presentation case.
It has a black hammer finish steel back plate which is free of any dents or blemishes, and is a true collectors item with the added interest of having featured in a high profile TV show.

Price Status Code UK P&P Overseas
 
SOLD
SC1838    
Early Type A Otis King's model K pocket calculator with white on black scales

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A fine condition example of an early Otis King's cylindrical slide rule calculator with the rare white on black scales.
This is a model 'K' type A serial no 8805, with very clean & legible helical scales enabling numerous mathematical calculations.
The patent no is 183723, with scale 414 on the bottom, & 423 on the top.
Made by Carbic Limited, 51 Holborn Viaduct, London EC1, this is quite a rare example as the serial number 8805 isn't prefixed by a letter, showing it to be one of the earliest models dating between 1921-1923.
The only blemishes to note are some minor plating loss on the nickel plated barrel and the cardboard box is worn condition.

Price Status Code UK P&P Overseas
 
SOLD
SC1794    
Fowlers Textile Type B calculator in presentation case

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A fine example of a Fowlers Textile Calculator Type B manufactured in Sale during the 1940's.Measuring 87mm in diameter, it comes with the black hammer finish steel backplate, and is in full working order.In very good condition, with clean scales & a chip free glass face, it comes in its original special blue velvet lined presentation case, which measures 120mm x 110mm.

Price Status Code UK P&P Overseas
  SOLD SC1759    
Fowlers Twelve Ten circular slide rule with leather case

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Designed in 1948 by Harold Fowler to mark the 50th anniversary of the founding of the firm by his father William Henry Fowler in 1898, this is the Fowler's Jubilee Magnum Extra Long Scale calculator. This was the largest circular calculator made by Fowler's measuring 12cm in diameter, and it has a 79" long scale extending over ten circles. In full working order, it has a black hammer finish steel backplate, and clean legible scales inside a chrome outer body which is in good condition with some chrome loss around the outer edges. It comes with its leather case which is in good sound condition & original instruction booklet.

Price Status Code UK P&P Overseas
  SOLD SC1741    
Fowlers Twelve Ten circular slide rule with leather case

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This is a fully working Fowler's Twelve Ten calculator in very good condition, dating to the 1930’s or 1940’s. Introduced in 1936, this particular calculator was primarily designed for Architects, Surveyors, Builders and Craftsmen, and is one of the more hard to find models with the chrome back plate. It was known as the 12-10 because it includes scales to convert twelfths to tens, yards to metres, lbs to kgs, inches to centimetres etc., and the two milled adjusting knobs rotate the dial and cursor. The scales are very clean and the dial reads FOWLER’S “ TWELVE – TEN “ PATENT CALCULATOR, Fowler & Co Manchester. In excellent cosmetic condition, the chrome back plate is free of any dents, with no tarnish or chrome loss and the glass front cover is also undamaged. The calculator measures 85mm in diameter, and comes in a leather case which is also in very good condition

Price Status Code UK P&P Overseas
  SOLD SC1636    
Large Fowlers Magnum calculator in special presentation case

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Dating to the late 1930's, this is the Fowler Magnum Long Scale calculator designed mainly for engineers, and consists of a series of concentric circular scales. It was the largest of the Fowlers range before the Jubilee Magnum came along in 1948. In very good condition, with clean scales & a chip free glass face, it comes in a special blue velvet lined presentation case, and is in full working order. It has a chrome backplate which is free of any dents or blemishes, and measures 120mm in diameter.

Price Status Code UK P&P Overseas
  SOLD SC1154    
Complete Otis King model K cylindrical slide rule with box & instructions.

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A fine example of a vintage Otis King cylindrical slide rule calculator complete with its box, instructions and original leather case. This is a type C, model 'K' serial no W8549, with very clean & legible helical scales enabling numerous mathematical calculations, all detailed in the original instructions which are also included. The patent no is 183723, with scale 414 on the bottom, & 423 on the top.
Made by Carbic Limited London during the 1960's, it really is in very good cosmetic condition with the only blemish being some light verdigris spotting on the black metal casing, and is in good working order.

Price Status Code UK P&P Overseas
  SOLD SC1556    
Fowlers Universal circular slide rule in presentation case

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A nice condition 1930's Fowlers Universal circular calculator, in a special blue velvet lined presentation case.
In full working order, the six scales perform numerous mathematical functions including multiplication, cube roots and and square roots.
The calculator measures 9cm diameter has a nice clean dial, and all is in very good condition including the presentation case.
It has a black hammer finish steel back plate which is free of any dents or blemishes, and is a true collectors item.

Price Status Code UK P&P Overseas
  SOLD SC1677    
The BRICAL money calculator by British Calculators Ltd, circa 1915

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Dating to around 1915, this is a fine example of the relatively rare Brical Money Calculating Machine, complete with its original leather bound blue velvet & silk line case, and two later replacement styluses.Its lightly engraved on the face 'The British Calculators Ltd, The "BRICAL"For Compound Addition, Patent' The serial number on the side is 25315. Made to add £sd cash amounts together, the stylus is inserted at the number desired and then moved clockwise (as indicated by the stamped arrow) to the end of the slot. This movement of the toothed ring advances the total as seen in the four result windows, and the carry operation between all rings is automatic. Clearing the calculator is done manually for each toothed ring which has a red tooth as a visual indicator of the zero position. Beginning with the outer ring, the operator slides the red tooth fully clockwise and repeats for each ring working inward. In good cosmetic condition and full working order, it also come with it's original instruction booklet titled 'Book-Keeping by Machinery' which although somewhat worse for wear is still complete and legible. The calculator measures 13cm in diameter and is deceptively heavy, weighing just over 650grams with its case.

Price Status Code UK P&P Overseas
  SOLD SC1456    
Rare 1920's Fowlers Type H circular calculator / sliderule.

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This Type H calculator is one of the rarer models of the Fowlers circular slide rule range, being one of the first of the range of double sided slide rules that Fowlers introduced in the first quarter of the 20th century.
Dating to around 1920 the type H model followed on from the Scientific Publishing Co Fowler’s Patent Pocket Calculator which was patented in 1910.
The calculator measures 68mm in diameter not including the stem & ring, and as can be seen from the photos is in very good cosmetic condition with some minor nibbling on the metal edge , which is only noticeable on close inspection. The card scales are very clean and legible, and the glass is clear with no chips or damage, the serial number 2513 is engraved on the outer edge. It is in full working order and comes with a nickel plated outer case which I think is original but appears to have had the internal blue velvet lining replaced or re-fitted.

Price Status Code UK P&P Overseas
  SOLD SC1459    

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This is a rare Calculigraphe circular slide rule by Henri Chatelain which dates to the latter part of the 19th or early 20th century. The design is based on the Boucher calculator introduced in 1876, and was made in Paris. It's a double sided calculating circle with one moveable dial and the other fixed, and performs numerous mathematical calculations including cube and square roots
In good working order, with clean scales, in a chrome pocket watch style case which is also in excellent condition.
Measures 53mm in diameter.

Price Status Code UK P&P Overseas
  SOLD SC1258    
Muldivo Mentor mechanical pinwheel calculator

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This is a nice condition Muldivo Mentor pinwheel calculator incorporating 10 digit setting register, 16 digit results register, and 8 digit revolution register, also has a back transfer mechanism. Model WSR 160, serial no 224415, made in Germany by Walther, this is a quality calculator, the pinwheel mechanism being machined from brass. Not only a great conversation piece, but an unusual retro piece from the late 1950's which is becoming increasingly difficult to find, particularly in such good condition. In full working order, overall dimensions, 11" x 6", weight around 6kgs, overseas buyers please email for shipping costs.

Price Status Code UK P&P Overseas
  SOLD SC1234    
Facit C1-13 mechanical calculator 1961

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A vintage mechanical calculator made by Atvidaberg - Facit in Sweden. The model is the C1-13, this particular design was produced between 1960 - 1964 and the serial number 799433 allows us to date it to 1961. It has a 10 digit keyboard with 8 digit counter and 13 digit accumulator. Cosmetically there are signs of wear and tear, with some paint loss, and a small crack in the results window (see photo 4, the crack is just before the number 3). However, it is in full working order, although the tips of the plastic indicators are missing, but the slides still work and do not affect the operation of the calculator. This is a heavy item at around 6kgs, and measures overall width 11.5" x 7.5"depth x 6" high.

Price Status Code UK P&P Overseas
  SOLD SC686    
Muldivo Pinwheel calculator

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Nice condition Muldivo Pinwheel calculator incorporating 12 digit setting register, 18 digit results register, and 10 digit revolution register, serial no DER 160648. Similar to the Mentor in that it's fitted with a back transfer mechanism, This transfers the number in the result register, centre right, to the setting register, centre, which can be very useful in chain calculations. Probably made by Thales in Germany this calulator is in full working order with original plastic dust cover, and dating from the late 1950's. Overall dimensions, 11" x 6", weight around 6kgs, overseas buyers please email for shipping costs.

Price Status Code UK P&P Overseas
  SOLD SC548    
Fowlers Magnum Textile calculator

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Fowlers Magnum Textile circular calculator, measures 12cm diameter, in very good condition and in leather case which is also in fine order. Also comes with its original 42 page instruction book which although a little dog-eared is complete and perfectly useable. Dating to around 1950, its becoming increasingly more difficult to find these items in such good and complete condition.

Price Status Code UK P&P Overseas
  SOLD SC276    
Original Odhner pinwheel calculator

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Original Odhner pinwheel mechanical calculator. Grey metal case, made in Sweden, serial no 1049 - 52417. In good condition with only minor paint loss. Dating to around 1960, these are rapidly becoming must have desktop accessories, as well as collectables. In full working order this is a heavy item weighing over 6kgs! Overseas buyers please email for cost of shipping.

Price Status Code UK P&P Overseas
  SOLD SC264    
Vintage Facit NTK mechanical calculator

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This is a vintage mechanical calculator made by Atvidaberg - Facit in Sweden. The model is the NTK which was produced between 1954 - 1957, and the serial number 473672 allows us to date this particular one to 1955. It has a 10 digit keyboard with 8 digit counter and 13 digit accumulator. In very good condition and fully working, this is a heavy item at around 6kgs, and measures overall width 11.5" x 7.5"depth x 6" high. Overseas buyers please email me for shipping costs.

Price Status Code UK P&P Overseas
  SOLD SC294    
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