## A Classic Engineering Tool
This is a KEUFFEL & ESSEN DECI-LON slide rule, a precision instrument used for multiplication, division, logarithms, trigonometry, and other complex calculations. The Decilon model is known for its accuracy and durability, making it a favourite among engineers, scientists, and mathematicians for decades. This particular example comes complete with its original box and a pocket aristo slide rule, adding to its collectibility and usability.
## Condition and Collectibility
The slide rule appears to be in good condition, showing signs of use consistent with its age. The scales are clear and legible, and the slide moves smoothly. The original box shows some wear, but protects the instrument well. This KEUFFEL & ESSEN Decilon is a desirable piece for collectors of vintage scientific instruments, as well as those interested in the history of engineering and calculation.
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#### As of 1/10/2021 we will be implementing a 7 day collection rule – items must be collected within 7 days unless an agreement is arranged in the event of instances such as being away on holiday, medical reasons etc. Any lots that are not collected within 7 days will be liable to a storage charge of £1.20 per day. Thank you. ####
