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Slide rules and books from László and Gyula Juszt

Brief history Near to the National Museum of Budapest, once were an optician store. Two opticians - László and Gyula Juszt opened it in August 1918 after quitting from their uncle Ferenc Juszt's company. In the beginnings they sold mostly optical instruments - e. g. binoculars, goggles, cameras, later they became a distributor of such western companies producing slide rules and drawing instruments (A. W. Faber, later Faber-Castell, Albert Nestler, Dennert & Pape). Juszt thought more slide rules can be sold when more literature would be available in hungarian language. So they began publishing a book from Antal Dravucz electrical and mechanical engineer on how to use these instruments. This was not an easy reading for those who does not have corresponding mathematical knowledge, so decided that a guide for beginners will be published. This booklet was based on an ordinary slide rule with only 4 scales, so everyone was able to learn using the slide rule even if the most simple rule has.

Books published These are the known books and catalogs published by Juszt:
  • A. W. Faber, A. Nestler, Dennert és Pape precíziós logarlécek és A. Nestler-féle számolóhenger első magyar árjegyzéke (First hungarian price list of precision slide rules made by A. W. Faber, A. Nestler and Dennert & Pape and special cylindrical slide rule made by Nestler)
  • Antal Dravucz: A logaritmikus számolóléc elmélete és használata (Theory and use of logarithmic slide rule)
  • A logarléc használatának kis kézikönyve kezdők részére (Beginners' booklet to using slide rules)
Slide rules
Juszt produced cheaper versions of the standard slide rules under the name GENIE from the 1930s. These rules were made of cheaper wood with simpler or missing steel springs and reinforcing, the scales were simply printed on paper sheets and glued on the body.
  • GENIE-Normál slide rule for basic calculations
  • GENIE-Rietz slide rule for professional engineering use
  • GENIE-Elektró slide rule for electrical applications
Further readings Slide rules manufactured in Hungary
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