"From my personal collecting and observation:
late 60's (two part base) - very slight spacing between every 2 vertical rows of holes. 1971, and 73 - rows of holes almost evenly spaced. 1977 on - much more spaced every 2 rows. The spun metal got…"
"More holes are on 1960s models, which usually (but not always) have two other characteristics: a copper finish, and a two-piece construction where the upper cone is attached to an inner cylinder which can be slid (partially) out."
"I have noticed very different run times and lava activity dependin on where in my living room I use my lamps. Some got hot very quick and some can run longer than they are supposed to.
Just the nature of the beast!"
"It all makes sense. No babbling haha. I appreciate you and the other guys weighing in.
I've actually narrowed things down a little. After watching it on the other base I realize it does the exact same thing on both bases (same watt bulbs)…"
"So I'm not sure of what steps you took with this lamp. Are the pictures with a different base than the description you gave of the flow stopping after 6 hours? I ask because the pictures seem to be of wax that hasn't…"
"Keith, why do you think this particular lamp is overheating? Is it possible the previous owner kept it on too long? You think changing to a frosted bulb or using a dimmer is the solution? Is there anything else I might be missing?"
"Thanks guys. The lamp was made in 1990. Was going to try the dimmer but was thinking I would dim it a little the whole time. Maybe I will try your idea of bringing it down once it's flowing. Seems like a good idea. "
"You say after six hours it globs up on the bottom. A hot lamp will have many lava bubbles at the top, lava moved up by heat. Not sure how old lamp is, possible lava could be getting old, as lava does have a lifespan, so to speak. …"
"So it looks like the lamp take the standard 2-2.5 hours or so to get going, then flows great, and then somewhere around hour six it goes into the dormant phase where it globs up on the bottom and sits there. If I let it cool down for a half hour to…"
"You guys are right. After my last post the lava flowed better than I had ever seen it. It was on a different base with a different bulb. I assumed because it had stopped flowing after being on for 10 hours that it was an overheating problem, but now…"
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