At the far left, above, is a 16-candle power lamp. In the center is a 32-candle power lamp. At the far right the lamp and socket interior are shown. Below, to the left, is a socket design for lamps with either one or two filaments. Below, to the right, is a standard socket design.

The socket with a patent number of 360244 was granted to Charles G. Perkins on March 29, 1887; the patent was for an electric lamp and socket. The socket with patent number 345008 was granted to Jean Theodore Van Gestel on July 6, 1886; it was for an incandescent lamp and connections.

Reference
1) "Perkins Incandescent Lamp", Western Electrician, Vol 4, May 4, 1889, pg 236.