Rudolf Wolf
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Johann Rudolf Wolf was a Swiss astronomer and mathematician best known for his research on sunspots.
Rudolf Wolf
Swiss Geodetic Commission
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The Swiss Geodetic Commission is a commission of the Swiss Academy of Sciences, founded in 1861 within the framework of the Central European Arc Measurement, which later became the International Geode
Rudolf Wolf
…needle experiment, dropping a needle on a plate 5000 times to verify the value of π, a precursor to the Monte Carlo method. In 1861, he presided the Swiss Geodetic Commission a commission of the Swiss Academy of Natural Sciences. This commission was created during the publication of the Dufour map, and its initial work…
Geneva old Observatory 1830
Gravimeter with variant of Repsold-Bessel pendulum.
Ibáñez apparatus calibrated on the metric Spanish standard and used at Aarberg, in canton of Bern, Switzerland in 1880.
Closeup of National Prototype Metre Bar No. 27, made in 1889 by the International Bureau of Weights and Measures (BIPM) in collaboration with Johnson Mattey and given to the United States, which served as the standard for American cartography from 1890 replacing the Committee Meter, an authentic copy of the Mètre des Archives produced in 1799 in Paris, which Ferdinand Rudolph Hassler had brought to the United States in 1805.