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Quoted from Howell & Schroeder’s History of the Incandescent Lamp (pub. 1927):
“…Herman J. Jaeger obtained a patent on a tipless construction which consisted of an ‘L’ shaped exhaust tube sealed to the inside of the stem tube away from the pinched seal. After the stem had been made in the usual way, this ‘L’ shaped exhaust tube was inserted in the stem tube and a fine pointed flame heated a spot on the side of the latter. The bent portion of the exhaust tube was then welded to this heated spot in the stem tube and by blowing through the exhaust tube a hole was made through the stem tube. Thus the exhaust tube, when sealed off, was covered by the base, making a tipless lamp.” |
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