MICROMETER n.
An instrument, used with a telescope or microscope, for measuring minute distances, or the apparent diameters of objects which subtend minute angles. The measurement given directly is that of the image of the object formed at the focus of the object glass. Circular, or Ring, micrometer, a metallic ring fixed in the foc…
NAKED a.
worn in ancient times. Shak. -- Naked eye, the eye alone, unaided by glasses, or by telescope, microscope, or the like. -- Naked-eyed medusa. (Zoöl.) See Hydromedusa. -- Naked flooring (Carp.), the timberwork which supports a floor. Gwilt. -- Naked mollusk (Zoöl.), a nudibranch. -- Naked wood (Bot.), a large rhamn…
NATURAL a.
derived from, the creation, or the world of matter and mind, as known by man; within the scope of human reason or experience; not supernatural; as, a natural law; natural science; history, theology. I call that natural religion which men might know ... by the mere principles of reason, improved by consideration and exp…
NEWTONIAN a.
most frequently, to the mathematical theory of universal gravitation. -- Newtonian telescope (Astron.), a reflecting telescope, in which rays from the large speculum are received by a plane mirror placed diagonally in the axis, and near the open end of the tube, and thrown at right angles toward one side of the tube,…