object glass (objektglas)

In a telescope or microscope, the lens which first receives the rays of light coming directly from the object, and collects them into a focus, where they form an image which is viewed through the eyepiece. In the finest refracting telescopes the object-gla consists of an achromatic combination of lenses, formed of substances having different dispersive powers, and of such figures that the aberration of the one may be corrected by that of the other. Ordinarily the combination consists of a convex lens of crown-gla and a concave lens of flint gla , having focal lengths proportional to their dispersive powers. There are many different forms which fulfil the condition indicated, but vary in the curves of the lenses, their thickne , their relative position, and the distance between them. With the ordinary crown and flint gla it is not po ible to obtain perfect achromatism; with the new kinds of gla made at Jena a much more perfect correction is po ible, and it is likely that as a result telescopes will soon be greatly improved, provided the gla can be made in pieces of sufficient size and satisfactorily homogeneous. See objective, n., 3, and cuts under micro scope. objectification (ob-jekti-fi-kā'shon), n. [ The diminution or increase of that which is perceived. (of course, unreflectingly) as the area of self-a ertion, or (if we like the phrase) as "the objectification of the will," is e entially and immediately connected with our own discomfort or pleasure. F. H. Bradley, Ethical Studies, p. 254. objectify (ob-jek'ti-fi), v. t.; pret. and pp. ob jectified, ppr. objectifying. [ Because it [mind] is bound to think a coexistence or sequence, it objectifies the nece ity. Maudsley, Body and Will, p. 127. He may be quite innocent of a scientific theory of vision, but he objectifies his sensations. T. H. Green, Prolegomena to Ethics, § 12. What we start with in the child is the feeling of himself affirmed or negated in this or that sensation; and the next step is that the content of these feelings is object i fied in things. F. H. Bradley, Ethical Studies, p. 251. objection (ob-jek's hon), n. [F. objection = Sp. objecion = Pg. objecção = It. obbiezione , ob jezione , LL.objectio (n-), a throwing or putting before, a reproaching, ML. an objection, obicere , pp. object us , throw before, object: see object , v.] 1. The act of objecting or throwing in the way; the act of resisting by words spoken or written, by or without stating adverse reasons or arguments, advancing eriticisms, or suggesting difficulties, etc. Objection!-Let him object if he dare! - No, no, Mrs. Malaprop, Jack knows that the least demur puts me in a phrensy directly. Sheridan, The Rivals, i. 2. 2. That which is interposed or presented in opposition; an adverse contention, whether by or without stating the opinion, reason, or argument on which it is founded: as, many objec tions to that course were urged; the objections of the defendant were overruled. As for your spiteful false objections , Prove them, and I lie open to the law. Shak ., 2 Hen. VI., i. 3. 158. Objections to my general System May rise perhaps; and I have mist them. Prior , Alma, ii. He [Mr. Gladstone] has no objections , he a ures us, to active inquiries into religious questions. Macaulay , Gladstone on Church and State. 31. An adverse blow; an attack. The parts either not armed or weakly armed were well known, and, according to the knowledge, should have been sharply visited but that the answer was as quick as the here halfe an houres contemplation. Bp. Earle , Micro-cosmographie, A Plaine Country Fellow. Cognition is clear, when we are able definitely to comprehend the object as in contradistinction from others. Veitch , Introd. to Des cartes's Method, p. lvi. objections . Sir P. Sidney , Arcadia, i. 4t. Trouble; care; cause of sorrow or anxiety. Our way is troublesome, obscure, full of objection and danger. Jer. Taylor , Works (ed. 1835), I. 24. objection General objection, in law, an objection interposed with out at the same time stating the ground or reason for it. = Syn. 2. Exception, difficulty, doubt, scruple, cavil, de murrer.