In a message dated 3/22/2008 9:37:05 P.M. Eastern Daylight Time, ger55 at comcast.net writes: How can you tell if it might be a Lambert instead? By "migrated"... do you mean that because the Lamberts were made only 1900-1902, others took up the patent?? =========== Most Lambert cylinders are hollow, no matter what their color; only the last, in 1905, had a hastily applied plaster core (because Edison's 1888 tapered core patent expired). Lamberts were thus made from 1900-1905; by Jan 1906 they were bankrupt. Only the very first ones were white, the natural color of the celluloid. Those also tended to be fairly thick. Allen _www.phonobooks.com_ (http://www.phonobooks.com) **************Create a Home Theater Like the Pros. Watch the video on AOL Home. (http://home.aol.com/diy/home-improvement-eric-stromer?video=15?ncid=aolhom00030000000001)