The New Elements of Hand-Railing - Softcover

Inhaltsangabe

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1876. Excerpt: ... Plate 1. TANGENTS AND THE CIRCLE Figure 1. The formation and perfect construction of hand-rail wreaths depend entirely on tangents or straight lines touching the circumference of a circle. The point of contact, or where they exactly touch, is determined by drawing a line from centre O, cutting the circumference, thus fixing a point to draw a tangent, which must be always at right angles with said line from centre O. Here it will be understood that a joint can be made on any part of a circle not exceeding half its diameter, this being the limit that a wreath can be formed in one piece; which is seldom required, and can be done only in certain situations. The problem before us needs no further explanation. It is simple, and understood at a glance; yet it is the starting-point and foundation on which rest the whole system of hand-railing. Not a single movement can be made until the positions of joints and tangents are shown on ground-plan. This will be fully and practically explained as we proceed to examine one or two other problems equally simple, and, with their aid, endeavor to show that this elegant branch of joinery merely consists in the proper combination of a few lines arranged in such manner as to make this art a perfect and exact science; but by no means complicated or intricate in any of its parts. Young beginners should be informed that no art, however simple, can ever be successfully acquired unless its elementary principles are first known. Let the learner bear this in mind, and carefully examine the first three or four plates of this work, which clearly show the meaning and intention of every line really necessary for the exact construction of any wreath, no matter what may be its shape or form. Fig. 2 shows the semi-ellipse or half oval, the...

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