Guest soledadsp Posted December 21, 2013 Share Posted December 21, 2013 1931 PLYMOUTH HEADLIGHT GLASS? IT SAY TWILITE ON GLASS AND MEASURES 10 1/8" IN DIAMETER. Link to comment Share on other sites More sharing options...
mribbich@wi.rr.com Posted December 21, 2013 Share Posted December 21, 2013 Check it over good there should be a part number on them. Marv. Link to comment Share on other sites More sharing options...
Tom Burtch Posted December 22, 2013 Share Posted December 22, 2013 These are too large for a 1931 Plymouth. The original lenses (on US cars) were Twilite, but only 9 5/16" outside diameter and 8 7/8" prism diameter. Link to comment Share on other sites More sharing options...
Guest soledadsp Posted December 27, 2013 Share Posted December 27, 2013 WHAT ARE THEY OFF OF? ANY IDEA? Link to comment Share on other sites More sharing options...
ply33 Posted December 27, 2013 Share Posted December 27, 2013 Check it over good there should be a part number on them. Marv.WHAT ARE THEY OFF OF? ANY IDEA?See Marv's comment. If I recall correctly, the Twilite part number on my car's head lamp lenses is on the inside. But there should be a part number someplace on them which can then be used to look up the application. Link to comment Share on other sites More sharing options...
Guest soledadsp Posted December 27, 2013 Share Posted December 27, 2013 See Marv's comment. If I recall correctly, the Twilite part number on my car's head lamp lenses is on the inside. But there should be a part number someplace on them which can then be used to look up the application. I looked on the headlamps and their is no part number on them, just three patent number from 1920, 1923, 1927. Link to comment Share on other sites More sharing options...
drwatson Posted December 27, 2013 Share Posted December 27, 2013 Here's a page from a 1930's Auto-Lite lens catalog w/applications for "Twilite" 10-1/8" lenses; if you accurately measure prism diameter you'll likely find the application or part # on the list. With luck it won't be one of the "no-longer-existing-trucks". Link to comment Share on other sites More sharing options...
Guest soledadsp Posted December 27, 2013 Share Posted December 27, 2013 IF 10 1/8 IS HORIZONTAL AND THE OTHER NUMBER IS A VERTICAL MEASUREMENT THAN I NEED THE NEXT PAGE THAT CONTINUES WITH 10 OR 10 1/16. IT IS ALMOST A COMPLETE SQUARE. Link to comment Share on other sites More sharing options...
drwatson Posted December 27, 2013 Share Posted December 27, 2013 IF 10 1/8 IS HORIZONTAL AND THE OTHER NUMBER IS A VERTICAL MEASUREMENT THAN I NEED THE NEXT PAGE THAT CONTINUES WITH 10 OR 10 1/16. IT IS ALMOST A COMPLETE SQUARE.There's no Horoz. & Vert. measurement in this case. The lens page I posted list "outside and prism diameter". Outside diam. is from one outside edge of the glass to the exact opposite edge. The "prism" is that part of the lens where light passes thru & is slightly smaller in diameter than the outside edge. It's the raised part that fits snugly in the inner edge of the headlight ring. Link to comment Share on other sites More sharing options...
Guest soledadsp Posted December 27, 2013 Share Posted December 27, 2013 There's no Horoz. & Vert. measurement in this case. The lens page I posted list "outside and prism diameter". Outside diam. is from one outside edge of the glass to the exact opposite edge. The "prism" is that part of the lens where light passes thru & is slightly smaller in diameter than the outside edge. It's the raised part that fits snugly in the inner edge of the headlight ring.When I measure the raised part it is 9 3/8" not on your sheet. Link to comment Share on other sites More sharing options...
Curti Posted December 28, 2013 Share Posted December 28, 2013 I have a different book, there is no 9 3/8 OD or prism. The PN for a 10 1/8 is 1013T Link to comment Share on other sites More sharing options...
Guest soledadsp Posted December 28, 2013 Share Posted December 28, 2013 what is pn and 1013t Link to comment Share on other sites More sharing options...
Curti Posted December 28, 2013 Share Posted December 28, 2013 It is a Twilite with a 10 1/8 outside diameter. Link to comment Share on other sites More sharing options...
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