Word: inch
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Thin sheets of saddle-shaped concrete typify Mr. Candela's architecture; a geometrician would describe them as sections of a hyperbolic paraboloid. Their most common application is in roofs for large buildings, since an inch-and-a half thick slab shaped in this way requires only one support for every 2500 square feet, far fewer than a flat surface would require...
...high-energy electrons from Stanford's linear accelerator as a sort of microscope, he and a team of assistants proved that protons and neutrons, which form the bulk of matter, are dense at their centers, cloudlike outside and only one forty-thousandth of a billionth of an inch in diameter. Later research taught Hofstadter that protons, which have positive charges, and neutrons, which are electrically neutral, are similar in structure. The main difference is that the negative cores of neutrons balance out the positive charge on the outside...
M.I.T.'s 350 million copper needles are lost in space. Scientists cannot even as-certain if the one-half inch wires sent aloft to relay radio signals were ejected from their orbiting container, according to George R. Huguenin, senior engineer for the Space Radio Project...
Most of the milpas are very rocky, with white stones everywhere in the black earth. The Indians hoe around the rocks and around the corn, deft and sure in upturning the green, prolific weeds within a fraction of an inch of the corn shoots--never uprooting the corn, never cutting through the bean plants or squash vines they grow with the corn...
Easy, isn't it--but remember that we're doing sub-miniature work. Our coils must be wound with wire so fine it's hardly visible. Our diamond tip must be perfectly rounded and polished to .0007"--that's seven TEN-THOUSANDTHS of an inch. And, most important of all, the whole needle and needle-arm assembly must be perfectly free to trace grooves as fine as 2,000 vibrations per inch (our math upon request); must be perfectly free from resonances in the range of frequencies possible in the plastic; must be mounted in such a way that...