Hi,
I am working on a museum exhibit and have a light bulb that I would like help identifying. On the glass it has the GE logo and says "Edison Mazda" on the bulb. It is 22 cm (8.6") tall and a diameter of 11.5 cm (4.5") The base has 2 patented dates, which are on your wonderful patent portion of this website, but that still doesn't help me, as I have no idea how long this patent was used. What I make out on the base (it's not real clear and my eyes are bad) is 300 W, 123 V. Hand written on the glass piece on the interior of the bulb is "C2 300"
I am also wondering why there is a tip at the top of the glass. All early light bulbs seem to have this, and I (as well as everyone I have asked) am assuming that this is a result of the manufacturing process, but I want to be sure, as I've read on your site that both hand and machine methods were used.
Thank you so much for your help,
JIM