HYDROPLANE n. 2 definitions
A plane, or any of a number of planes, projecting from the hull of a submarine boat, which by being elevated or depressed cause the boat, when going ahead, to sink or rise, after the manner of an aëroplane.
IMAGE n.
f images themselves. -- Image Purkinje (Physics), the image of the retinal blood vessels projected in, not merely on, that membrane. -- Virtual image (Optics), a point or system of points, on one side of a mirror or lens, which, if it existed, would emit the system of rays which actually exists on the other side of t…
ISOMETRIC; ISOMETRICAL a.
ume remains constant. -- Isometrical perspective. See under Perspective. -- Isometrical projection, a species of orthographic projection, in which but a single plane of projection is used. It is so named from the fact that the projections of three equal lines, parallel respectively to three rectangular axes, are equa…