www.antik.it/Antique-measuring-instruments/8125-Logarithmic-Slide-Rule/
Code 8125
EUR 1500.00
In stock
1743784882Code 8125 Logarithmic Slide RuleCircular logarithmic slide rule FER model H 39 n. 1675 from the thirties, Italian patent n. 1680, housed in its original wooden box with a round shape like the instrument, complete with instruction booklet. Calculator patented worldwide for the rapid and safe calculation of the dimensions of reinforced concrete structures. The instrument is made of lithographed aluminum and the dial is composed of 10 rings on which the logarithmic graduations are indicated and a crank with eight buttons that can be raised or lowered to allow calculations, an instruction booklet explains in a very analytical way with examples and diagrams the correct use. Made by Costruzione Officine Meccaniche F.lli Ingg Ferrero Corso Mazzini 29 Savona in the thirties. Good condition, perfectly working. Instrument diameter cm 27 - 10.6 inch, height cm 4 -1.6 inch.
The slide rule is based on logarithms and owes its origins to the scale devised in 1607 and published in 1623 by the English astronomer and mathematician Edmund Gunter (1581-1626). Gunter's scale consists of two scales of logarithms, which go from one end to the other and are used with compasses to multiply and divide. In 1630 another English mathematician, the Reverend William Oughtred (1574-1600), placed the two scales side by side, eliminating the compasses, thus manufacturing the first slide rule with sliding scales.
The effectiveness of the slide rule as a tool for quickly performing multiplications and divisions, but also squares, roots and many other operations through the addition or difference on logarithmic scales, was appreciated only from the end of the 18th century. Special versions were prepared for particular activities, for example to measure wood, iron bars, barrels, heads of livestock, to calculate taxes on wines and spirits. Slide rules were also built for chemical equivalences, to calculate rents, barometric heights, photographic exposure times. It is believed that in the 19th century more than 250 types of slide rules were in use.
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Italy: delivering on the average in 24 h.
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Antique measuring instruments
Code 8125 Logarithmic Slide Rule
Antik Arte & Scienza sas di Daniela Giorgi - via S. Giovanni sul Muro 10 20121 Milan (MI) Italy - +39 0286461448 - info@antik.it - www.antik.it - Monday-Saturday: 10am-7pm
