Heinrich GeisslerDied 24 Jan 1879 at age 63 (born 26 May 1815).German glassblower for whom the Geissler (mercury) vacuum pump and the Geissler tube are named. With the unprecedented (1/100 mm of mercury) low vacuum he produced in sealed glass tubes, he made available to early physicists a valuable tool to study the effect of electricity on the remaining traces of gases therein. These produced more detailed studies of the structure of matter.[DSB and EB give birth year as 1815, but Chambers Bio. Dict. gives 1814.] |