If you were here earlier in the week, checking out my White Wenesday post, you saw my lamp, but did you also see what was beside it? It is a lightening rod, used earlier in this century, on top of primarily two story homes, so that instead of lightening striking the house, it would hit the rod, then follow the wire down to the ground where it would "ground" itself. It kept the home from catching on fire (hopefully). The one below is 3' tall. The reason I have them in my house, is because they have white glass "pretties" on them.
The one below is 5' tall. There are many different ones, but these days they are getting hard to find, in tact. The color, size, and shape of the "pretty" in the middle depends on who made it, and where. When we found these, the guy told my husband if he would crawl up and take them off, he could have them.