Wrote Letter L-267 of 1695-08-18 to Anthonie Heinsius about detonating gunpowder in a closed glass bulb and measuring the increase in volume after the explosion; in a partial vacuum, glass bulbs may implode

August 18, 1695
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Text of the letter in the original Dutch and in English translation from Alle de Brieven. The Collected Letters at the DBNL - De Digitale Bibliotheek voor de Nederlandse Letteren

Leeuwenhoek wrote this letter about …

an experiment in which gunpowder was detonated in a closed glass bulb. Measurement of the increase of volume after the explosion. When there is a partial vacuum, glass bulbs may implode.

L. learned glass-blowing at the market.