Been living in a 1912 vintage house for over 15 years, and this weekend I replaced a light bulb in the top of a stairwell leading to an unfinished basement. Well,the obvious light switch in the stairwell did not control that socket. I found that an old bakelite & ceramic rotary Perkins switch controlled the socket, but here is the odd thing. The switch seems to be timed somehow .. I turn it off and later I find the light back on again. Is this possible? I've found a similar switch on Ebay and other sites and it should just be an off-on mechanism, but there is a circular box that the switch is fitted to that might contain more? Anyone know more about these switches and functioning beyond on-off?