Cutaway Views of Various Lamp Bases and Sockets
In the year 1886 the President of The Edison Electric Light Company, E. H. Johnson, issued a small booklet¹ in which lamps were pictured that were claimed to infringe Edison patents. Two hundred sixty six patents that were issued to the Edison Company during the years 1876 and 1886 were listed and the pictured competitive lamps had the apparent infringing features pointed out. Cutaway pictures of seven competitive lamps and sockets are shown below.

--------------------------------------------------------------------------------------------------------------------------------------------------------

Reference
1) The Edison Electric Light - The Legal and Commercial Status, E. H. Johnson, Oct 7, 1886, 25 pages.

Go to: Early Incandescent Lamps, or click "Back" on your browser