In August 1879, Thomas Alva Edison hired Ludwig Böhm as a glassblower for his light bulbs. Böhm developed many of Edison’s first light bulbs. Bohm arrived from Germany, played the zither, wore a red cap from a German university, and sang Alpine yodels in his spare time. The light bulbs were then passed to Francis Jehl, who created the vacuum inside the bulbs, first with his own lungs and then with Geissler and Sprengel pumps, before sealing the bulb with a blowtorch. The vacuum inside the bulb reached 0.00001 atmospheres.
