Drafting Instruments and Operations ...

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J. Wiley & sons, 1885 - Drawing instruments - 152 pages
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Page 105 - Three numbers may be in proportion when the first is to the second as the second is to the third.
Page 11 - Tlie like dimensions of similar solids are to each other as the cube roots of their volumes.
Page 110 - At a given point in a given straight line, to erect a perpendicular to that line. Let AB be the given line and C the given point.
Page 150 - primary " colors should not be largely introduced into the border ; first, since they, when obtrusive, are adapted to ruder or less impressible tastes than the " secondary " hues, shades, and tints (235) which are more gratifying to delicate tastes ; and secondly, from the impertinent conspicuousness which they may give to the border. Drawings which are shaded only in sepia or ink, or any dark neutral tint, may have the border done in the same, or in a dark complementary color. Tinted ink drawings...
Page 11 - The volumes of all similar solids are to each other as the cubes of their corresponding dimensions.
Page 36 - For the final cleaning of the drawing, stale bread, or the old-fashioned black india-rubber, if not sticky, is good ; but, aside from the carelessness of ever allowing a drawing to get very dirty, any fine drawing will be injured, more or less, by any means of removing a considerable quantity of dirt from it.
Page 149 - For line-drawings the border should be a geometrical design, in lines, with curved or angular corners, or with combinations of straight or curved lines, forming geometrical corner-pieces. These borders may vary in complexity from a rectangular border in single lines to borders which, though geometrical, may be elaborate and elegant, thus echoing the character of the drawings included by them.
Page 106 - ... AB-AD : AD. But, since the radius is the half of AB, the diameter DE is equal to AB, and consequently, AE— AB=AD=AF•, also, because AF=AD, we have AB—AD—FB: hence, AF : AB :: FB : AD, or AF; whence, by inversion, AB : AF :: AF : FB. Scholium. This sort of division of the line AB, viz., so that the whole line shall be to the greater 'part as the greater part is to the less, is called division in extreme and mean ratio, It may further be observed, that the secant AE is divided in extreme...
Page 149 - When the drawing is a shaded one, containing, therefore, some free-hand work, the border may be partly free-hand also; but should still be largely geometrical in its design, and should represent a real border of substantial materials, corresponding to the subject of the drawing. Thus, the mouldings and ornaments should represent ornamental metallic castings, carvings in wood, mouldings in plaster, or scrolls and leaves of rolled metal; but garlands, tassels, and tendrils, etc., should not be introduced.
Page 147 - ... that is, in harmony. 0. — Lettering. 245. The title to a drawing should answer distinctly the four questions — What, Who, Where, and When — What, including the use and scale ; Who, both as to designer or inventor, and draftsman ; Where, both as to the place, institution, or office where the drawing was made, and the locality of the object drawn; and When. 246. The use of lettering on a drawing having now been explained, the design and execution of the title may be treated under the following...

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