pole carriage

A carriage furnished with a pole or tongue, in contradistinction to one with shafts or thills. IMG:content-1276.png:[blocks in formation] 2. Elect . ( pl .): The same as ELECTRODES (q. v.). 3. Magnetism ( pl .): The two points at opposite ends of a magnetic bar where the attraction is greatest. One points to the north and is called the North Pole, the other to the south and is called the South Pole. Similar poles repel, di imilar poles attract each other. Sometimes there are inter me diate poles, called " consequent poles." When the earth is viewed as a magnet, the spots where the magnetic needle stands vertical are called the "magnetic poles." In 1830 Sir James Ro found that the magnetic north pole was in 76° N. and 96° 43' W. At the same time the position of the magnetic south pole was calculated to be in 754 S. and 154° E. But it does not always retain the same place. This is shown by what is called the declination or variation of the magnetic needle, i . e., the angle which it makes with the geographical merid ian. At London, in 1580, this was 11° 36 E., and in 1884, 18°8′ W. The unit magnetic pole or the pole of unit strength, is that which repels an equal pole at unit distance with unit force. In the C. G. S. system it is the pole which repels an equal pole at the dis tance of one centimeter with a force of one degree. (Everett: The C. G. S. System of Units, ch. x.) 4. Math .: In a polar system of coordinates, the point from which the radius vector of any point is estimated. 5. Math . Geog . ( pl .): The two extremities of the earth's axis, i. e., the two points where the axis meets its surface. That above the horizon in our latitude is called the North Pole, the other, on the farther side of the globe, is called the South Pole. "From pole to pole is undistinguish'd blaze." Thomson: Summer , 436. chin, bench; go, gem; thin, this; poledavy (1) Pole of a polar line : A point in the plane of a conic section, such that if any straight line be drawn through it, cutting the curve in two points, and tangents be drawn to the curve of these points, they will intersect each other on the given line. (2) Pole of maximum cold : Temperature : A point where the cold is greater than anywhere around. (3) Poles of a circle of a sphere: The points in which a diameter of the sphere perpendicular to the plane of the circle pierces the surface of the sphere.