National Geographic : 1973 Jun
Fresh realms of experience await the entire family in the Society's four Special Publications for 1973-74. Savor the folkways cherished by American Mountain People. Be among the privileged few who have penetrated the mysteries of Primitive Worlds. Explore the nat ural beauty along Ameri ca's Inland Waterway. Join those working to save the Vanishing Wildlife of North America. Each hardbound volume contains 200 or more pages profusely illustrated in color. Send no money now. You will be billed $4.25 plus postage and handling for each book at time of shipment. Pay only for the books you wish to keep. 867A POSSIBLY THE WORLD'S MOST INEXPENSIVE QUARTZ WATCH. A quartz crystal and amicro-computer keep itaccurate to within 15 seconds a month* To the best of our knowledge, the TIMEX Quartz is the most inexpensive quartz watch in the world. But while you pay less for a TIMEX, it doesn't mean you will get less. The TIMEX Quartz Watch, programmed ac curate to within 15 seconds a month, is one of the world's most accurate watches. To make it extraordinarily accurate, we began with a tiny crystal of quartz. When electric current is passed through this crystal, it vibrates exactly 49,152 times every second, so regularly that it becomes the heart of an excep- tionally accurate time-keeping system. To keep the watch accurate and de pendable, we then incorporated this vibrating crystal of quartz into a highly sophisticated micro-computer system, packed with over 300 transistors. The micro-computer system serves as the brain of the watch, to control its accuracy. If, for any reason, this accu racy should vary, the micro-computer system readjusts and restores the watch to its programmed accuracy. And the TIMEX Quartz Watch is engineered to be as rugged and dependable as you ex pect a TIMEX to be. The watch has an adjustable metal band and a water and dust resistant case. Equipped with an automatic day-date indicator and sweep second hand, it's powered by a replaceable energy cellt that lasts for a year, so you never have to wind it. At $80 the TIMEX Quartz Watch is a tribute to American leadership in auto mation and electronic technology. And chances are, if someone ever makes a less expensive quartz watch, it will probably be us. THE TIMEX®QUARTZ WATCH.$80 Large illustration: Model 968602. Small illustration: Model 969502. *Regulation may be necessary to achieve this accuracy. tWe recommend genuine TIMEX Energy Cells. Other cells not meeting Timex specifications may cause a malfunction.