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Die große Enzyklopädie des mechanischen Rechnens

18.206.16.123 | Identification | Aide

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Patent:GB191512793


Brevet:GB 191512793
Titre:Improvements in Devices for Calculating Percentages and the like
Date:07.09.1916
Lieu:
Pays:Royaume-Uni
Personne:Harvey, Charles James (P)
Entreprise:
Liens internes:Analogrechner, Nomogramm, Proportionalrechner
Mots-Clefs:
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 GB191512793


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Aus der Patentschrift GB191512793

"Proportional calculators.-Percentage-computing devices comprise a box provided with a lid having parallel but unequal ends b, b<1> divided into the same number of divisions and connected by coloured or other lines d'. Adapted to lie across the lines d<1> and to move parallel to itself is a second scale c, of which a variety is provided. The divisions in the scales b, b<1> are oppositely numbered. Any desired percentage of any value upon the second scale may thus be determined...."