1. This was motivated mainly by errors in logarithmic tables made by the human'computers'of the time. 2. In 1628, he modified the logarithmic tables of Briggs and added more details to them. 3. The devices were used for creating logarithmic tables . 4. In 1670, he published trigonometric and logarithmic tables more accurate than the existing ones of Briggs. 5. According to Shelushkov, he used the memorized logarithmic table for calculations . and by psychologist Artur Petrovsky. 6. His logarithmic tables ( " Tables of logarithms ", 1796 ) had various reprints in Italy and Europe. 7. Before the advent of the computer, ray tracing calculations were performed by hand using trigonometry and logarithmic tables . 8. To facilitate use with logarithmic tables , one usually takes logs to base 10 or e, or sometimes base 2: 9. In 1630 Johann Faulhaber published a 100 cent monochord table, which contained several errors due to his use of logarithmic tables . 10. He tried to busy himself with painting, learning silk-screening, playing chess, and writing logarithmic tables for the sheer enjoyment of it.
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