Try Googling vitrite and glass .-- feed me 12 : 16, 28 December 2007 ( UTC)
2.
I cannot answer it except to say that I think it should be "'vitrite "', which is a type of very hard glass.
3.
:: : " The Electrical Engineer " for Oct . 25, 1889 p 322 talks about the " Vitrite Company " as making the insulating glass used in the base of light bulbs.
4.
I find a description of the base of the bulb, inside the brass screw-form base, being filled with " vitrite " in pp 68-69 of " Electricity in Mining " By Sydney Ferris Walker, Van Nostrand, New York, 1907, viewable at Google Books calls it " vitrite . " Numerous other sources found from Google Book search spell it " vitrite . " I have corrected the spelling in the Incandescent light bulb article . talk ) 18 : 20, 28 December 2007 ( UTC)
5.
I find a description of the base of the bulb, inside the brass screw-form base, being filled with " vitrite " in pp 68-69 of " Electricity in Mining " By Sydney Ferris Walker, Van Nostrand, New York, 1907, viewable at Google Books calls it " vitrite . " Numerous other sources found from Google Book search spell it " vitrite . " I have corrected the spelling in the Incandescent light bulb article . talk ) 18 : 20, 28 December 2007 ( UTC)
6.
I find a description of the base of the bulb, inside the brass screw-form base, being filled with " vitrite " in pp 68-69 of " Electricity in Mining " By Sydney Ferris Walker, Van Nostrand, New York, 1907, viewable at Google Books calls it " vitrite . " Numerous other sources found from Google Book search spell it " vitrite . " I have corrected the spelling in the Incandescent light bulb article . talk ) 18 : 20, 28 December 2007 ( UTC)
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