It looks as though the toddler Jesus should be proclaiming, "Ta Da".

Setting for wishing the whole Shorpy Family the very best of the Holiday Season and to enjoy the Best Christmas ever!

Another use was in various components of our 1940s-era electric train set, like an illuminated billboard, the light at the top of the water tower, the interior of a train station and a street lamp.

Growing up we always called little round bulbs like this one that, as they were used to light the dial on our radio and my grandfather kept some in a little box to replace burned out ones. The inside itself of the big radio was interesting too, with its warm glowing vacuum tubes.

When I first looked at this picture, I perceived the topmost lightbulb as an animal's eye, and I wondered how a rabbit or whatever got into the manger scene!

Anyway, Merry Christmas!