PROF. GREENHILL gives currency to quite an erroneous idea, in last week's NATURE (p. 50). He says “in the Foucault experiment of the pendulum which shows the rotation of the earth, the slightest ...

SOME four years since, while arranging a Foucault's pendulum for use in the class-room, it occurred to me to endeavour to obtain a permanent record of the experiment, and as the results were very good ...

The year is 1851, and doubts regarding the Earth spinning is also a massive one, as many people argue over this activity of the planet and how it relates to other entities in the galaxy. However, the ...

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