Friden became the chief designer of the Marchant Calculating Machine Company. He found his place in the Marchant Calculating Machine Co. of Oakland within a year. The border shows two of his inventions&colon; the thermosiphon and a calculating machine. Leibniz got the idea for a calculating machine in 1672 in Paris, from a pedometer. Samuel Morland sent him a calculating machine and his loudspeaker. Thus it was already much more a complex calculating machine than a clock. In 1840 Fowler produced a mechanical calculating machine which operated using balanced ternary arithmetic. Wiener used the term in reference to "calculus ratiocinator", a calculating machine constructed by Leibniz.