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Circular slide rule and time zone scale, cardboard

Mathematics

1947

Example of G. Charpentier's Calculimetre, a metal

Mathematics

Lord's calculator, a circular slide-rule for texti

Mathematics

1837-1848

Circular slide rule: "Dialor for calculation of vi

Mathematics

Circular logarithmic slide rule by K. Emil Troger,

Mathematics

Circular slide rule, c 1870.

Mathematics

1870-1875

Circular slide rule, brass, 5" diameter

Mathematics

Circular slide rule in brass, by Dring & Fage, Lon

Mathematics

1878-1882

Circular slide rule in pocket watch form

Mathematics

Circular slide rule, 6 1/2-inch diameter, in case

Mathematics
"Boucher" circular calculator, by Stanley, Great Turnstile, London

"Boucher" circular calculator, by Stanley, (glass

Mathematics

1880-1890

Circular slide rule, 1660-1680.

Mathematics

1660-1680

A.E.W. double sided circular slide rule

Mathematics

1948-1952
Circular slide rule with lockable cursor arm, plastic made by Lithocalculator Company, Calfornia, USA.

circular slide rule

Mathematics

Midget circular slide rule by Dietzgen with instru

Mathematics

1955

Circular slide rule by Paul Pouech ("Cercle comple

Mathematics

Textile calculator

Textile Industry

c.1900

Circular plastic slide rule, model no.28, made in

Mathematics

National Coal Board methane dr

Coal Mining

Circular slide rule for surveying calculations: "C

Mathematics

Circular No.101C dial slide rule with sythetic lea

Mathematics

1965-70

Brass circular slide rule 30cm diameter with two s

Mathematics

1818-1820

A. E. W. circular slide rule

Mathematics

1948-1952

Circular slide rule, cardboard with plastic cursor

Mathematics

1955

Circular slide rule in pocket watch case

Mathematics

1900-1920

Circular slide rule, cardboard (warped), for heat

Mathematics

1962

Rectangular plastic slide-chart made by Perrygraf

Mathematics

Circular slide rule, cardboard with plastic cursor

Mathematics

Circular metal slide rule by Muchall & Co. in fitted black l

Mathematics

Circular slide rule for calculation in simple inte

Mathematics
Fowler long scale calculator, circular slide rule with carrying case and instruction booklet, 1920-40.

Fowler long scale calculator, circular slide rule

Mathematics

1920-1940
Halden "Calculex" patent circular slide rule (5 inches diameter) in case, c. 1906

Halden "Calculex" patent circular slide rule (5 in

Mathematics

1904-1907
German circular slide-rule, type KRS 40, No.1246, 17 1/2 inches diameter, fitted in a metal case 18 1/2 x 20 inches

German circular slide-rule, type KRS 40, No.1246,

Mathematics
Circular slide rule, Fowler "Magnum" long-scale calculator, in fitted case with instruction booklet by Harold Fowler

Circular slide rule, Fowler "Magnum" long-scale ca

Mathematics
Spiral scale of chords in the form of a circular slide rule, with celluloid cursor in metal mount, cardboard 4 13/16-inch diameter with descriptive leaflet

Spiral scale of chords in the form of a circular s

Mathematics
Circular slide rule by Pickett, metal and plastic, in leather pouch with instruction booklet

Circular slide rule by Pickett, metal and plastic,

Mathematics
Palmer's Computing Scale, improved by Fuller, (a circular logarithmic slide rule, with numerous gauge points); on reverse side "Fuller's Time Telegraph"

Palmer's Computing Scale, improved by Fuller

Mathematics

1846-1880
"Automatic calculator", a circular logarithmic slide rule, scale about 10" long, made of thin card

"Automatic calculator", a circular logarithmic sli

Mathematics
Herrmann's circular slide rule No.159 by Wiesenthal & Cie

Herrmann's circular slide rule No.159 by Wiesentha

Mathematics
Circular slide rule by Fowler and Co., Manchester, model RX, double faced, serial no. 7384, with descriptive leaflet in metal case

Circular slide rule by Fowler and Co., Manchester,

Mathematics
Fearnley's patent Universal calculator, circular slide rule with cardboard scale in fitted mahogany case, unsigned, British,1880-1900. Used at the University Observatory, Cambridge, at Madingley Road, Cambridge, England.

Fearnley's patent Universal calculator, circular s

Mathematics
Circular slide rule (two cardboard discs with radial transparent plastic cursor) by General Industrial Co.1788 Montrose, Chicago 13,Illinois, also marked Slide Chart Corp., 1959, Perrygraf, Marywood, Illinois

Circular slide rule (two cardboard discs with radi

Mathematics

1959-1960
The "Small" Pocket Calculator, a circular slide rule patented 1918, made by G. Small, Boston, in leather pouch

The "Small" Pocket Calculator, a circular slide ru

Mathematics
Circular slide rule with lockable cursor arm, plastic, in envelope with instructions: " Eckel dial rule", Engineers' Model, made by Lithocalculator Company, Calfornia

Circular slide rule with lockable cursor arm, plas

Mathematics
Circular slide rule, Halden 'Calculex', in leather pouch with instruction booklet

Circular slide rule

Mathematics
Circular slide rule, Fowler "Magnum", in leather case with descriptive leaflet

Circular slide rule, Fowler "Magnum", in leather c

Mathematics
Circular slide rule, watch form, in metal case, known as "Halden Calculex", with printed pamphlet of instruction

Circular slide rule

Mathematics

1918-1921