from The Century Dictionary and Cyclopedia
- n. In an apparatus for the drawing of objects on a greatly enlarged scale from microscopic originals, that point in the pantographic system of links at which the microscopic objective is located over the slide or object being observed and reproduced. As the object-point is moved over the original, a tracing-point at the long end of the leverage traces the outline on a scale which gives the desired multiplication of size.
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At this juncture Kepler ran into the greatest difficulty concerning the visual process, namely, how to deter - mine the distance from the object-point to the eye.
In fact, the above-mentioned rule was also forgotten, and very rarely it was fleetingly asserted that the image of an object-point is seen at the vertex of the cone of rays that reach the cornea of the observer's eye, as if this were a self-evident truth.
He also inferred that the “position” of the stimulated point on the retina defines the “direc - tion” in which the object-point is located and in which, therefore, the luminous point is to be found.
The rays coming from an object-point are reflected by the mirror so that their lines of prolongation back of the mirror meet in a point behind the reflecting surface.
The mind therefore creates a very tiny figure, a “luminous point”; which it locates at the vertex of the telemetric triangle, where the object-point should be found.
In conclusion, the mechanics of vision, as Kepler conceived it, emerges as follows: the object-point emits rays in straight lines in all directions; from these rays
The starting point, as well as the object-point of our science is Man. (