Ismailia
a small town on Lake Timsah, through which the Suez Canal passes. It stands on the railway from Cairo to Suez and on the Sweet Water Canal.
Only in Collier's New Encyclopedia
Single-source entries: I (30)
Each of these 20 subjects appears in only one of the 6 encyclopedias on this shelf. None is long enough to carry a page by itself, so they are gathered here by letter. Anything that grows moves out to a page of its own.
Isnik
a town of Asia Minor in which, in 325, the first ecumenical council was held.
Only in Collier's New Encyclopedia
Isobaric Lines
lines drawn on a map or globe through all places where the barometer is at the same height at a certain time. Telegraphic communication enables these lines to be drawn with some immediateness.
Only in Collier's New Encyclopedia
Isochromatic Lines
in optics, colored rings appearing when a pencil of polarized light is transmitted along the axis of a crystal, as of mica or niter, and, after passing through a plate of tourmaline, finally reaches the eye. (is-ōk'ron-ism), ISOCHRONISM a property appertaining to all systems in equilibrium, by which, when slightly disturbed more or less, the oscillations resulting are all performed in the same time, or so nearly in the same time that any retardation or acceleration is imperceptible. When a pendulum, for instance, is allowed to vibrate till it rests, it will be found that no perceptible difference exists between the vibrations of longer or shorter extent, the same number of vibrations being made in the same length of time. Again, in the finde product detect any difference sound produced by a musical string, in the pitch of a note made by a smart blow on the pianoforte key and a gentle touch; yet a very small difference in the number of vibrations per second would be perceptible to the ear.
Only in Collier's New Encyclopedia
Isochronal
Uniform in time; moving in equal time. When the long and short arcs of a balance are caused to be performed in the same time by means of a hairspring, that spring is said to be an isochronal one, or isochronous. When the vibrations of a pendulum are all of the same duration, no matter through what extent of arc the pendulum moves, the vibrations are isochronal.
Only in American Watchmaker and Jeweler
Isodynamic
ISOCLINIC, and ISO- GONIC LINES, lines of equal force, equal inclination, and equal declination, are three systems of lines which being laid down on maps represent the magnetism of the globe as exhibited at the earth's surface in three classes of phenomena, the varying intensity of the force, the varying dip or inclination of the needle, and its varying declination from the true meridian.
Only in Collier's New Encyclopedia
Isogeothermic Lines
a term introduced by Kupffer for lines drawn on a globe or map across those places in which the mean temperature of the soil is the same.
Only in Collier's New Encyclopedia
Isomerism
in chemistry, a term applied to those bodies which are composed of the same elements, in the same proportions, but which differ either in their physical characteristics, or in their chemical properties. They may be divided into three distinct classes: isomeric, metameric, and polymeric bodies. Isomeric bodies or isomerides are those which show analogous decompositions and changes, when heated, or when treated with reagents, but differ in physical properties. Metameric bodies, or metamerides, are those which exhibit dissimilar transformations when heated, or when acted on by by reagents. Polymeric bodies, or polymerides, contain the same elements in the same proportions, but have different molecular weights.
Only in Collier's New Encyclopedia
Isomorphism
a general law, discovered in 1819 by Professor Mitscherlich, of Berlin, by which the variation of minerals is governed. single It is that the ingredients of any any species of mineral are not absolutely fixed as to their kind and quality, but one ingredient may be replaced by an equivalent portion of some analogous ingredient. Thus in augite the lime may be in part replaced by portions of peroxide of iron, or of manganese, while the form of the crystal and the angle of the cleavage plane remain the same. substitutions are, however, confined within certain limits.
Only in Collier's New Encyclopedia
Isonandra
in botany, a genus of Sapotaceæ. Isonandria obovata, an evergreen tree, growing in Tenasserim, yields a kind of gutta-percha, and I. gutta, the gutta-percha itself.
Only in Collier's New Encyclopedia
Isoperimetrical
in geometry, a term applied to figures which have equal circumferences or perimeters.
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Isopoda
in zoölogy, an order of Crustaceans, division Thoracipoda, legion Edriophthalmia. The body is composed of seven segments, as a rule nearly equal in size. The legs, which are seven pairs, are almost of the same length. They are fitted for walking, swimming, or adhering as parasites. The posterior (abdominal) appendages are converted into leaf-like respiratory apparatus. The heart is near the tail. The common wood louse is a well-known example of Isopoda.
Only in Collier's New Encyclopedia
Isothermal Lines
lines on a globe or map passing over places in which the mean general temperature is the same. Humboldt first generalized the observations and collected the facts bearing on isothermal lines.
Only in Collier's New Encyclopedia
Isotropism
physical homogeneity or amorphism; identity of elastic forces of propagation of vibration (light, heat , sound), or identity of susceptibility to magnetization, in all directions. ISRÄELS
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Issik-Kul
lake in a Central Asia, in the Russian province of Semiryetchensk, situated, at an elevation of 5,000 feet above sea level, between the Terskei Ala-tau range on the S. and the Kangei Ala-tau on the N. It measures 112 miles long, 38 miles broad, and covers an area of 1,980 square miles. Its water is very salty, but full of fish.
Only in Collier's New Encyclopedia
Issue
in law, the point of fact in dispute which is submitted to a jury.
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Issus
anciently, a seaport on a gulf of the same name in Cilicia, Asia Minor, celebrated for the victory which Alexander the Great obtained here over Darius (333 b. c.), by which the camp and treasure and family of Darius fell into his hands.
Only in Collier's New Encyclopedia
Issy
a village in the French department of Seine, half a mile S. W. from Paris. There are manufactures of wax, cloth, chemicals, etc. Here on July 3, 1815, Blücher defeated Davoût. In 1870-1871, during the siege of Paris by the Germans, the fort of Issy suffered severely from the artillery fire. It now forms part of the S. W. defenses of Paris. Pop. about 20,000.
Only in Collier's New Encyclopedia
Istar
the ancient Babylonian god of war and destruction. ISTER. See DANUBE.
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Isthmus
in geography, a narrow neck of land joining two larger portions, as the Isthmus of Suez and the Isthmus of Panama. The name was often employed by the ancients without any addition to designate the Isthmus of Corinth, joining the Peloponnesus to continental Hellas. Here were celebrated the Isthmian games.
Only in Collier's New Encyclopedia