The great and increasing demand for irregular forms to be made from sheet metal has made Triangulation an important factor in Sheet Metal Pattern Development. This has induced the writer to lay before the sheet metal worker, a work designed for the purpose of enabling him to acquire a thorough understanding of this branch of Pattern Cutting.
Triangulation has in many instances been a subject of more or less mystery. However, from a study of Geometrical works, we conclude that its secrets have long been known.
This work is submitted with every confidence that if attention is devoted to the subject matter enclosed, one will be enabled to more clearly understand the principles involved in Triangulation as Applied to Sheet Metal Pattern Development.
Originally published in 1920, this book is a comprehensive treatise for cutters, draftsmen, foremen and students, progressing from the simplest phases of the subject to the most complex problems employed in the development of sheet metal patterns, with practical solutions of numerous problems of frequent occurrence in sheet metal shops. It is illustrated by means of 124 engravings in line and half-tone, including many reproductions of photographs of sheet metal models, made expressly for this work.
- Elementary Principles
- A Simple Transitional Fitting
- The Oblique Cone
- A Transitional Fitting from Rectangular to Round Which Makes an Offset
- A Twisted Transitional Fitting
- The Pattern for the Frustum of an Oblique Cone
- A Transitional Fitting from Oblong to Round
- A Two-Pronged Fitting Which Can Be Made in One Piece
- Some Principles of Orthographic Projection as Applied to Triangulation
- The Representations of Objects on the Vertical, Horizontal, Profile and Oblique Supplementary Planes of Projection
- The Pattern for a Fitting Whose Ends Are Not in Parallel Planes
- The Pattern for a Fitting Whose Ends Are Not in Parallel Planes, Second Demonstration
- A Transitional Elbow from Round to Rectangular
- A Transitional Offset from Round to Rectangular
- A Three-Pieced Tapering Elbow
- The Ship's Ventilator
- On the Tapering Elbow to Be Made in Any Number of Pieces
- A Transitional Elbow in Rectangular Pipe
- A Transitional Elbow from Round to Elliptical
- The Helical Elbow
- When It Is Required That a Round Pipe Should Join the Frustum of an Oblique Cone
- A Branched Fitting Commonly Known as "Breeches"
- A Simple Two-Pronged Fitting
- A Two-Pronged Fitting Whose Prongs Are Unequal
- On the Two-Pronged Fitting When It Is Required That the Prongs Radiate at a Given Angle to the Main Stem
- On a Fitting with Any Number of Prongs
- The Right or Scalene Cone Considered in Securing the Patterns for a Branched Fitting
- Concluding Remarks
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