Ginseng,
2 C cells. They have a nice switching mechanism that gives you the option of On all the time, On when you lift it off the table, and Off all the time. They are very well made of satin-finished nickel-plated brass with 3 sets of 3 black pinstripes running lengthwise, a glass--not plastic lens, and black band around the base of the tube that has 3 radium dots that glow (or used to glow 50 years ago!) so you can find it in the dark. Very elegant IMHO. You can find them semi-regularly on eBay.
Kirk