For a hungry small boy to crack one walnut, or even a dozen, is no problem. But cracking walnuts in hundreds of thousands is what the California Walnut Growers' Association does, and it wanted a cracker which did not break up the meats.
For the supplicant walnut men, the University of California's College of Agriculture invented a machine in which the walnuts ride on whizzing belts past a buzzsaw. The buzz-saw nicks a groove in the shells of the nuts. Then, as the nuts pass a tiny aperture, an explosive charge of acetylene and...
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