National Geographic : 1974 Nov
01974THEPARKERPENCOMPANY. JANESVILLE, WISCONSIN,U.SA. '- '. . '.'. . ^t ^^1k .'. .I. . . .......... Kole uyster perpetual uay-uae tnronometer in b1euola, rarKer/5 classicbail 'en in Solid sterling silver. No part of this s2,800 watch is made more precisely than the point of a Parker 75 Classic Ball Pen. The point of a Parker 75 Classic Ball Pen isnot large. Fifty points, side by side, measure one inch. For this pen to write the way we want it to-clean, crisp, without skip or blob -the point must be as near a perfect sphere as we can make it. Though we take three weeks to make the point, perfection escapes us. We can, however, come close. We allow a maximum deviation of ten millionths of an inch in its sphericity. We are equally demanding but less successful in controlling the diameter. A given batch of balls may vary from another of the same point size by plus or minus 100 millionths of an inch. The stainless steel socket in which our point turns must also be very true. Into the medium ball point socket, for example, we put six channels, each about four-thousandths of an inch in width and depth. Through these the ink moves to the point. The interesting thing about all this is we take this trouble with the disposable parts of the 75 Classic Ball Pen. These are all parts of the refill cartridge. Needless to say, we worry as much, if not more so, about those parts you keep. The slender Parker 75 Classic Ball Pen. Though it's made up of approximations, it does make a very nice gift. D PARKER World's most wanted pens Parker 75 Classic Ball Pensfrom $5to $45.Matching pencils. Ample engraving area for full monogram.