Word: micro
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...cylinder displacement), standard racing cars, then gave them up for earth-hugging midget (up to 145 cu. in.) racing. Last week, at Brawley, Calif., 50-year-old Ward Swarthout, now a grandfather, was happily racing just a couple of inches off the ground in the tiniest of all racers: micro midgets...
...micros are the latest fad in auto racing, an ever-growing sport that drew an estimated 23 million spectators last year to all types of competition. Four years ago, one of the first micros, a Yuma, Ariz, job, caught the eye of old Racer Swarthout, who runs his own auto-repair shop at El Centro, Calif. Swarthout promptly built the first one in the Imperial Valley. Since then, micro-midget racing has spread as far east as Pennsylvania. Reason for the popularity of the micros: they can be built for as little...
Limits to Leeway. California's Imperial Valley Micro-Midget Association, like others, has imposed stringent limits on size and engine displacement for the racers. The buglike cars must be no longer than 5 ft., no higher than 34 in., must have a wheel spread of no more than 42 in. Valve-in-head engines may have a maximum of 18 cu. in. of total cylinder displacement; overhead valve engines are limited...
With that kind of leeway, micro-midget fans have scrounged engines from a wild assortment of places: lawnmower motors, outboards, motor scooters, units from generating and refrigerator plants, and even bilge-pump engines salvaged from Navy landing craft. Average weight of car and engine...
...These discoveries," Sognnaes states make clearer what is involved in the decay of a tooth. The micro-organisms that are believed to cause decay. . . are much wider than the individual crystal and organic units that make up the enamel. Hence, before a micro-organism can invade the enamel, both the organic and the inorganic matter (or the bond between the two) must be destroyed or weakened in some...