[Eliot Ness]

Not quite sure what you mean about the lines, but I consider the grille cloth shown in this auction to be oriented correctly:

http://www.ebay.com/itm/Antique-Radio-Gr...27e4d7b1f1

In-other-words the top, as pictured, would be oriented at the top of the radio.

I'm referencing what I consider to be an original piece of Philco 90 grille cloth:

http://radio.macinmind.com/gallery/main....itemId=395