Knowledge without frontiers Knowledge Without Frontiers | Page 33

Peterlin’s attaché case, purchased in the US, which he used on business trips
for decades.
Technical Museum of Slovenia. Photo: Nebojša Tejić, STA.
Used by engineers and engineering students to carry out quick and fair-
ly accurate calculations, slide rules were a common tool in mechanical and
electrical engineering, aircraft design, in the military, in surveying, and
in all other fields where logarithms, trigonometry, roots, squares, mul-
tiplication, and division were required. Slide rules were eventually re-
placed by the HP-35 calculator, which France Rode helped design in 1972.
Technical Museum of Slovenia. Photo: Nebojša Tejić, STA.
33