Site.Conto1922 History
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09 March 2014
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09 March 2014
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The machines were produced by J Aumund, in Zurich from 1912, having been patented by him and Karl Karasek in 1905 and 1906 (patent CH 33474 + 38362). This was followed by patent CH 60809 in 1913. Carl Landolt took over production of the Conto in 1912.[^[[http://www.rechnen-ohne-strom.de/rechner-galerie/addiermaschinen/scheibenaddierer-metall/]] viewed 8 Mar 2014^]
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The machines were produced by J Aumund, in Zürich from 1912, having been patented by him and Karl Karasek in 1905 and 1906 (patent CH 33474 + 38362). This was followed by patent CH 60809 in 1913. Carl Landolt took over production of the Conto in 1912.[^[[http://www.rechnen-ohne-strom.de/rechner-galerie/addiermaschinen/scheibenaddierer-metall/]] viewed 8 Mar 2014^]
09 March 2014
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Carl Landolt was born in 1869 in Colmar, dying in1923 in Thalwil. From 1888 he worked as a statistician in Zurich and in in 1910 founded his company for the manufacture and trade in calculators.[^See Markus Bürgi "Landolt, Carl" in [[http://www.hls-dhs-dss.ch/textes/d/D48492.php]] viewed 8 Mar 2014^]
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Carl Landolt was born in 1869 in Colmar, dying in1923 in Thalwil. From 1888 he worked as a statistician in Zürich and in in 1910 founded his company for the manufacture and trade in calculators.[^See Markus Bürgi "Landolt, Carl" in [[http://www.hls-dhs-dss.ch/textes/d/D48492.php]] viewed 8 Mar 2014^]
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This Model C Conto calculator, serial 2175, was manufactured in ~1922 by Carl Landolt in Thalwil, Zürich.
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This Model C Conto calculator, serial 2175, was manufactured in ~1922 by Carl Landolt in Thalwil, Zürich.
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The machine is easier to operate than a stylus based lightening type calculator, since knobs are used for input (oddly being rotated anti-clockwise), but it is not possible to do direct subtractions with it (and there is no provision for complementary arithmetic). A window is provided to check the numbers as they are input. The Crescent-shaped slider at the top is moved to the right to perform an addition, the other lever being provided to bring the register back to zero. The machine is heavy and solid and this one still works reliably.
08 March 2014
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The machines were produced by J Aumund, in Zurich from 1912, having been patented by him and Karl Karasek in 1905 and 1906 (patent CH 33474 + 38362). This was followed by patent CH 60809 in 1913. Carl Landolt took over production of the Conto in 1912.[^[[http://www.rechnen-ohne-strom.de/rechner-galerie/addiermaschinen/scheibenaddierer-metall/]] viewed 8 Mar 2014^]
Carl Landolt was born in 1869 in Colmar, dying in1923 in Thalwil. From 1888 he worked as a statistician in Zurich and in in 1910 founded his company for the manufacture and trade in calculators.[^See Markus Bürgi "Landolt, Carl" in [[http://www.hls-dhs-dss.ch/textes/d/D48492.php]] viewed 8 Mar 2014^]
The machines were produced from 1912 to the mid-1920s by Landolt and after that by Alfred Müller.
Carl Landolt was born in 1869 in Colmar, dying in1923 in Thalwil. From 1888 he worked as a statistician in Zurich and in in 1910 founded his company for the manufacture and trade in calculators.[^See Markus Bürgi "Landolt, Carl" in [[http://www.hls-dhs-dss.ch/textes/d/D48492.php]] viewed 8 Mar 2014^]
The machines were produced from 1912 to the mid-1920s by Landolt and after that by Alfred Müller.
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(:title Conto 1922:)
From the Keuffel and Esser catalogue in 1895:
->The Charpentier Calculator is a circular Slide Rule 2 3/8 in. in diameter, with a circular slide which is revolved and set by the handle as may be required. This instrument reads scale against scale like the ordinary slide rule, and being made of metal, is but slightly subject to atmospheric variations. Square roots, sines and tangents as well as logarithms may be found with it, and as the circular sclae is equivalent to a straight one 5 7/8 in. long, results may be read off with a fair degree of accuracy. The small dimensions and light weight of the instrument make it a most useful pocket companion.[^//Keuffel & Eser Catalogue//, 1895, p. 185, [[http://mccoys-kecatalogs.com]]^]
!!! References
* [[http://meta-studies.net/pmwiki/uploads/Manuals/Notice_Calculimetre.pdf|Instruction Notice for Charpentier Calculimètre (in French)]]
->The Charpentier Calculator is a circular Slide Rule 2 3/8 in
!!! References
* [[http://meta-studies.net/pmwiki/uploads/Manuals/Notice_Calculimetre.pdf|Instruction Notice for Charpentier Calculimètre (in French)]]
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(:title Conto Model C 1922:)
This Model C Conto calculator, serial 2175, was manufactured in ~1922 by Carl Landolt in Thalwil, Zürich.
Carl Landolt was born in 1869 in Colmar, dying in1923 in Thalwil. From 1888 he worked as a statistician in Zurich and in in 1910 founded a company for the manufacture and trade in calculators, where he developed and in 1912 patented his Conto adding machine.[^See Markus Bürgi "Landolt, Carl" in [[http://www.hls-dhs-dss.ch/textes/d/D48492.php]]^]
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This Model C Conto calculator, serial 2175, was manufactured in ~1922 by Carl Landolt in Thalwil, Zürich.
Carl Landolt was born in 1869 in Colmar, dying in1923 in Thalwil. From 1888 he worked as a statistician in Zurich and in in 1910 founded a company for the manufacture and trade in calculators, where he developed and in 1912 patented his Conto adding machine.[^See Markus Bürgi "Landolt, Carl" in [[http://www.hls-dhs-dss.ch/textes/d/D48492.php]]^]
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08 March 2014
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%center% http://meta-studies.net/pmwiki/uploads/Conto.jpg
(:Conto 1922:)
From the Keuffel and Esser catalogue in 1895:
->The Charpentier Calculator is a circular Slide Rule 2 3/8 in. in diameter, with a circular slide which is revolved and set by the handle as may be required. This instrument reads scale against scale like the ordinary slide rule, and being made of metal, is but slightly subject to atmospheric variations. Square roots, sines and tangents as well as logarithms may be found with it, and as the circular sclae is equivalent to a straight one 5 7/8 in. long, results may be read off with a fair degree of accuracy. The small dimensions and light weight of the instrument make it a most useful pocket companion.[^//Keuffel & Eser Catalogue//, 1895, p. 185, [[http://mccoys-kecatalogs.com]]^]
!!! References
* [[http://meta-studies.net/pmwiki/uploads/Manuals/Notice_Calculimetre.pdf|Instruction Notice for Charpentier Calculimètre (in French)]]
(:Conto 1922:)
From the Keuffel and Esser catalogue in 1895:
->The Charpentier Calculator is a circular Slide Rule 2 3/8 in. in diameter, with a circular slide which is revolved and set by the handle as may be required. This instrument reads scale against scale like the ordinary slide rule, and being made of metal, is but slightly subject to atmospheric variations. Square roots, sines and tangents as well as logarithms may be found with it, and as the circular sclae is equivalent to a straight one 5 7/8 in. long, results may be read off with a fair degree of accuracy. The small dimensions and light weight of the instrument make it a most useful pocket companion.[^//Keuffel & Eser Catalogue//, 1895, p. 185, [[http://mccoys-kecatalogs.com]]^]
!!! References
* [[http://meta-studies.net/pmwiki/uploads/Manuals/Notice_Calculimetre.pdf|Instruction Notice for Charpentier Calculimètre (in French)]]