magneto bell (magneto bel)

An electric bell in which the armature of the electromagnet is polarized-that is, is a permanent magnet. The armature is alternately attracted and repelled when the alternate current from a magneto-electric machine is pa ed through the coil of the electromagnet, and a hammer attached to a continuation of the armature placed between two bells rings them. It is used as a telephone call-bell. Also called magneto call - bell. magnetod (mag'ne-tod), n. [ IMG:content-0074.png:Image for page 31 The Century Dictionary and Cyclopedia: The Century dictionary magnify The least error in a small quantity, as in a small circle, bel prop or rente in the circles of the heavenly orbs, N. Grew, Cosmologia Sacra, ii. 5. Speak, e'er my Fancy magnifie my Fears. Congreve, To Cynthia. 2. To cause to appear greater; increase the apparent dimensions of; enlarge or augment to the eye: as, a convex lens magnifies the bulk of a body to the eye. Since the shorter the focus of the lens the more closely may the object be approximated to the eye, the retinal picture is enlarged, causing the object to appear magnified in the same proportion. Encyc. Brit ., XIV. 259. 3. To exalt the power, glory, or greatne of; sound the praises of; extol; glorify. O, magnify the Lord with me, and let us exalt his name together. Ps. xxxiv. 3. Those highly magnify him whose judicious inquiry into his acts, and deliberate research into his creatures, return the duty of a devout and learned admiration. Sir T. Browne, Religio Medici, i. 13. 4. To represent as greater than the reality; exaggerate: as, to magnify a person's deeds; to magnify the evils of one's lot. ... My wife used every art to magnify the merit of her Goldsmith, Vicar, xvi. daughter. Magnifying power of a microscope, the ratio of the length upon the retina of any part of the image of the object looked at with the microscope to the length of the retinal image of the same object looked at without the microscope at a standard distance of 10 inches. In regard to the magnifying power of eye-gla es, complicated considerations have to be introduced. - Magnifying power of a telescope, the ratio in which the angle subtended by any linear dimensions of the object looked at is increased by the telescope. It is always equal to the focal length of the object-gla divided by that of the eyepiece. For a distant object the focal length of the object gla is that for parallel rays that is, its principal focal length; for nearer objects the focal length is greater, and the magnifying power is correspondingly increased.