Mathematicians Of The Day

6th March

On this day in 1689 Edmond Halley first wrote about diving equipment, perhaps prompted by his work on the Thames survey undertaken around that time. Halley proposed a mobile diving bell built on four wheels, and while he did not build that particular bell, he did build another as part of his salvage work on the wreck of the Guynie frigate.
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Quotation of the day

From Ferdinand von Lindemann
The oxygen atom has the shape of a ring, and the sulphur atom, the shape of a clot.
Quoted in L.I. Ponomarev, The Quantum Dice (Bristol, 1993) 40.