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Ancient gadgets from Earth
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MATHEMATICS 1

 One of my favourite science fiction stories was The Lensman by E E Doc Smith. There, with inertia-free travel and communication with beings from outside the universe, they nevertheless navigated inter-galactic space with the aid of a slide rule!

Thornton Slide Rule

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Thorntons Slide Rule


This is a British Thornton rule in excellent condition. It is complete with the Instructions For Use, and extra booklet entitled 'The Slide Rule Made Easy' and of course the plastic case.

360mm long by 51mm wide and 12mm thick maximum. Weighs 278g.
£45.00
Essentially a slide rule wrapped round a cylinder so it is helical!) this is in excellent condition. Model U (which has scale 429) and marked U3359.

Otis Kings Calculator U

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Otis King's Calculator


It is complete with its box which is in good condition but which has the label "Model L No. U4085" (and a full 8 page instruction booklet for this remarkable device which was even sold in the seventies - 1970's! Go here for much more detail.
153mm long by 30mm diameter. Weighs 260g.
£75.00
Essentially a slide rule wrapped round a cylinder so it is helical!) this is in excellent condition. Model R .

Otis King's Calculator R

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Otis King's Calculator

Essentially a slide rule wrapped round a cylinder So it is helical!) this is in excellent condition. Model R and marked R1323.

It is complete with its box which is missing one end and damaged the other a little (and a full 8 page instruction booklet for this remarkable device which was even sold in the seventies - 1970's! Go here for much more detail.
153mm long by 30mm diameter. Weighs 260g.
£75.00
Mathematics is the language of science. Calculators such as slide rules and other machines enabled us to make more predictions, use statistics and eventually hand over the world to quantum computers!
The slide rule is a mechanical analog computer. The slide rule is used primarily for multiplication and division, and also for functions such as roots, logarithms and trigonometry, but is not normally used for addition or subtraction. Slide rules come in a diverse range of styles and generally appear in a linear or circular form with a standardized set of markings (scales) essential to performing mathematical computations.
Wikipedia