Search the Dictionary

ment, through which the image formed by the mirror or object glass is viewed. Collimating eyepiece. See under Collimate. -- Negative, or Huyghenian, eyepiece, an eyepiece consisting of two plano-convex lenses with their curved surfaces turned toward the object glass, and separated from each other by about half the sum…

Eyepiece of a telescope, microscope, etc.

or, transmits the light received from the latter back through a hole in its center to the eyepiece placed behind it. -- Gregorian year, the year as now reckoned according to the Gregorian calendar. Thus, every year, of the current reckoning, which is divisible by 4, except those divisible by 100 aud not by 400, has 36…

, a Dutch astronomer of the seventeenth century; as, the Huyghenian telescope. Huyghenian eyepieceSee under Eyepiece.

arest the object (called the objective) is magnified by another lens called the ocular or eyepiece. -- Oxyhydrogen microscope, and Solar microscope. See under Oxyhydrogen, and Solar. -- Simple, or Single, microscope, a single convex lens used to magnify objects placed in its focus.

ard the object. Its office is to form an image of the object, which is then viewed by the eyepiece. Called also objective. See Illust. of Microscope. -- Object lesson, a lesson in which object teaching is made use of. -- Object staff. (Leveling) Same as Leveling staff. -- Object teaching, a method of instruction, in…

The eyepiece of an optical instrument, as of a telescope or microscope.

A telescope with a diagonal eyepiece, suspended vertically in gimbals by the object end beneath a fixed diagonal plane mirror. It is used for delineating landscapes, by means of a pencil at the eye end which leaves the delineation on paper.

n image in correct or normal proportions; giving a flat field of view; as, an orthoscopic eyepiece.

Having all or many degrees of power; having a great range of power; -- said of an eyepiece made adjustable so as to give a varying magnifying power.

With the lower focal points all in the same plane; -- said of sets of eyepieces so mounted that they may be interchanged without varying the focus of the instrument (as a microscope or telescope) with which they are used.

rmerly called vitreous electricity; -- opposed to Ant: negative electricity. -- Positive eyepiece. See under Eyepiece. -- Positive law. See Municipal law, under Law. -- Positive motion (Mach.), motion which is derived from a driver through unyielding intermediate pieces, or by direct contact, and not through elastic…

eter, a micrometer for an optical instrument, consisting of a reticule in the focus of an eyepiece. -- Reticulated work (Masonry), work constructed with diamond-shaped stones, or square stones placed diagonally.

undred pounds, -- used in weighing pitch. Microscope stand, the instrument, excepting the eyepiece, objective, and other removable optical parts. -- Stand of ammunition, the projectile, cartridge, and sabot connected together. -- Stand of arms. (Mil.) See under Arms. -- Stand of colors (Mil.), a single color, or fla…

nary means, usually by a camera provided with a telephoto lens or mounted in place of the eyepiece of a telescope, so that the real or a magnified image falls on the sensitive plate.

nd the eye end constitutes a portion of the horizontal axis of the instrument, having the eyepiece at the pivot and in the center of the altitude circle, so that the eye has convenient access to both at the same time. -- Universal joint (Mach.), a contrivance used for joining two shafts or parts of a machine endwise,…