Fluorescent lamp began with the Geissler tube continued as even better vacuums were produced. The most famous was the evacuated tube used for scientific research by William Crookes. That tube was evacuated by the highly effective mercury vacuum pump created by Hermann Sprengel. Research conducted by Crookes and others ultimately led to the discovery of the electron in 1897 by J. J. Thomson and X-rays in 1895 by Wilhelm Roentgen. But the Crookes tube, as it came to be known, produced little light because the vacuum in it was too good and thus lacked the trace amounts of gas that are needed
David Roentgen flat-pack home assembly without an allen key. According to his biography in the Encyclopædia Britannica Eleventh Edition of 1911, Roentgen was not a great cabinetmaker: "His forms were often clumsy, ungraceful, and commonplace; his furniture lacked the artistry of the French and the English cabinetmakers of the great period which came to an end about 1790. His bronzes were poor in design and coarse in execution; his work, in short, is tainted by commercialism. As an inlayer, however, he holds a position of high distinction. His marquetry is bolder and more vigorous than that of Riesener, who in other respects