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FER model logarithmic circular slide rule H 39 n. 1675 1930s

About the Item

FER model logarithmic circular slide rule H 39 No. 1675 from the 1930s, Italian Patent No. 1680, housed in its original round-shaped wooden box like the instrument, complete with instruction booklet. Worldwide patented calculator for rapid and safe calculation of dimensions of reinforced concrete structures. The instrument is made of lithographed aluminum and The dial has 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 its proper use in a very analytical way with examples and diagrams. Made by Construction Officine Meccaniche F.lli Ingg Ferrero Corso Mazzini 29 Savona in the 1930s. Buono stato perfettamente funzionante. Instrument diameter cm 27 - 10.6 inch, height cm 4 -1.6 inch.. The slide rule is based on logarithms and owes its origin 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 run from one end to the other and are used with compasses to multiply and divide. In 1630 another English mathematician, Reverend William Oughtred (1574-1600), placed the two scales side by side, eliminating the compasses, thus fabricating the first sliding scale slide rule. The effectiveness of the slide rule as a tool for quickly performing multiplication and division, as well as squares, roots, and many other operations through addition or difference on logarithmic scales, was not appreciated until the late 18th century. Special versions were prepared for particular activities, for example, to measure lumber, iron bars, barrels, heads of cattle, to calculate taxes on wines and spirits. Rules were also constructed for chemical equivalencies, for calculating rents, barometric heights, and photographic exposure time. It is believed that more than 250 types of slide rules were in use in the 19th century.

Dimensions:

Height: 1.6 in (4.07 cm)Diameter: 10.6 in (26.93 cm)

Materials and Techniques:

Aluminum

Period:

1930-1939

Date of Manufacture:

1930

Condition:

Wear consistent with age and use.

Seller Location:

Milan, IT

Reference Number:

1stDibs: LU1020244381902

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