The Body (D). This consists of the two long telescoping tubes: the outer - the sleeve; the inner - the draw-tube. To the upper end of the body (draw-tube) is attached the ocular, to the lower end the objective.
4. The Stand (A, B, C, etc.). - This is all the remaining portion of the instrument, and its various parts have received distinctive names, thus: A, base or foot - variously shaped (triangular, horseshoe, or circular), and sufficiently heavy to insure steadiness; B, pillar - portion above and below the stage, often jointed; C, arm; E, nose-piece - double, triple, or quadruple, into which several objectives are screwed, so that by turning either may be brought into visual position; F, objective; G, ocular; H, draw-tube; I, collar; J, rack and pinion; K, coarse adjustment; L, fine adjustment, both worked by a milled screw; M, stage; N, spring clips; O, mirror - with concave and plane surfaces, the former being used mostly; Q, diaphragm and substage; R, substage screw; S, stage aperture and substage; V, Abbe condenser - gives more light to objective, being of special service when examining stained specimens, which are recognized chiefly by color and not by outline.