Identifier: architecturaldra00teal (find matches)
Title: Architectural drawing : a textbook that combines the parctical instructions and examples that the student needs, with the suggestive programs, supplementary problems, etc, required by the teacher, written by an architect of wide experience who has also taught the subject for years at Teachers' College, Columbia University, and Mechanics' Institute, New York
Year: 1920 (1920s)
Authors: Teale, Oscar S
Subjects: Architectural drawing
Publisher: New York : U.P.C. Book
Contributing Library: Smithsonian Libraries
Digitizing Sponsor: Smithsonian Libraries

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Text Appearing Before Image:
FIG. 25 fAn Isograph Elliptic French Curve, Fig. 24, 34 ARCHITECTURAL DRAWING ing pen. When the pen is used it is necessary thatthe flat side of the lower nib shall at all times restflat against the edge of the French Curve. Fig. 25. In drawing the line, the pen must be so turned thatit will retain this relative position throughout the fulllength of the curved line. It will be observed thatsuch a line cannot be drawn continuously, with onestroke of the pen but must be made in comparativelyshort sections; it becomes very important therefore,that the union of one section with another must be
Text Appearing After Image:
TOOLS—IN PRACTICE 35 very carefully made to insure a continuously smoothline throughout the entire curved line. French curves cannot be used for all sizes of com-pound curves. There are many which, because oitheir size, too small or too large, must be made byhand, a spline or other aids. To make use of the French Curve it is necessaryto first sketch the desired line free-hand with the fullcombination of curves required, that is, by free-handdraw the desired combination curve. Then apply thewooden instrument and discover that part of segmentwhich most closely fits a portion of the line sketched.*

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