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More "Helix" Quotes from Famous Books
 ... a straight current bearing wire attracts iron filings, its power of attraction is very small; but its magnetic strength can be increased by coiling as in Figure 211. Such an arrangement of wire is known as a helix or solenoid, and is capable of lifting or pulling larger and more numerous filings and even good-sized pieces of iron, such as tacks. Filings do not adhere to the sides of the helix, but they cling in clusters to the ends of the coil. This shows that the ends of the helix ...
— General Science • Bertha M. Clark
... land-shells there is a considerable amount of variation in colour, markings, size, form, and texture or striation of the surface, even in specimens collected in the same locality. Thus, a French author has enumerated no less than 198 varieties of the common wood-snail (Helix nemoralis), while of the equally common garden-snail (Helix hortensis) ninety varieties have been described. Fresh-water shells are also subject to great variation, so that there is much uncertainty as to the number of species; and variations ...
— Darwinism (1889) • Alfred Russel Wallace
... selected, with its two lateral edges equally and very slightly incurved. A row of small flies was placed along one margin. When looked at next day, after 15 hrs., this margin, but not the other, was found folded inwards, like the helix of the human ear, to the breadth of 1/10 of an inch, so as to lie partly over the row of flies (fig. 15). The glands on which the flies rested, as well as those on the over-lapping margin which had been brought into contact with the flies, were all ...
— Insectivorous Plants • Charles Darwin
... feet of copper wire one twentieth of an inch in diameter were wound round a cylinder of wood as a helix, the different spires of which were prevented from touching by a thin interposed twine. This helix was covered with calico, and then a second wire applied in the same manner. In this way twelve helices were superposed, each containing an average length of wire of ...
— Experimental Researches in Electricity, Volume 1 • Michael Faraday
... that were dead, but the spirit of the drought was everywhere. The very rocks themselves, burnt black by centuries of sun, were painted with Indian prayers for rain. A thousand times he had seen the sign, hammered into the blasted rocks—the helix, that mystic symbol of the ancients, a circle, ever widening, never ending,—and wondered at the fate of the vanished people who had prayed to ...
— Hidden Water • Dane Coolidge
... motion, the axle can only be carried along when the tappet, n, has come to occupy the position shown in Fig. 3, that is to say, when the disk has moved from right to left a distance corresponding to the fraction of the helix formed in ...
— Scientific American Supplement, No. 492, June 6, 1885 • Various
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