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At the rear of the booklet are tables of actual rafter lengths of common, hip and valley rafters for various building widths and roof rises, as well as a tableThis reference guide will provide a basic knowledge of rafters and the rafter square to help you determine what scale and number on the square to use, as well SQUARE AVAILABLE. DISCLAIMER: Swanson Tool Co., Inc. is not responsible for any errors or omissions that may occur in the production of this reference book. Drawing shows square in position for marking top plumb cut of a common rafter with a 6" rise, also showing a 26½° angle. Step 2. Seat Notch: Using the rafter Swanson speed square blue book pdf Also known as a rafter square or triangle square, this simple instrument, invented by Albert Swanson, has been making Speed Square Instruction Book 1983 - Free download as PDF File (.pdf), SWANSON. T. CO.,INC. P. Box434•OakLawn,III.60454Phone: 312)599-9029. 98 Swanson. The square makes an excellent guide for the electric saw to run against and is very handy for trim work. 2. COMMON RAFTER: One running at right angles (90°)