## The American House Carpenters' and Joiners' Assistant: Being a New and Easy System of Lines, Founded on Geometrical Principles, for Cutting Every Description of Joints, and for Framing the Most Difficult Roofs; to which is Added a Complete Treatise on Mathematical Instruments. Also, Mensuration, Tables of the Weights and Cohesive Strength of the Several Materials Used in the Construction of Buildings, &c |

### From inside the book

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Page 11

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**pencil**; then move the**pencil**and rods around , taking care to keep the outsides of the rods pressed against the pin , and the segment AC B , will be described . Figure 3 . To form an ellipsis by means of a string . Let AB be the ... Page 46

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**pencil**point . Hair compasses . Bow compasses . Sector . And we shall also give some account of the following ; viz . , Whole and halves . Proportional compasses . Triangular Compasses . Marquois's scales . ( Beam Compasses . Plotting ... Page 48

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**pencil**point ; but , in order to draw arcs or circles with ink or black lead , compasses with a movable point are used . In the best description of these compasses the end of the shank is formed into a strong spring , which holds firmly ... Page 83

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**pencil**passes directly over it when drawn along this edge . 2. Set the rule closely against the hypothenuse , making the zero point of the corresponding artificial scale coincide with the index upon the triangle . 3. Move the triangle ... Page 89

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**pencil**or pen , or a blunt tracing point , as may be required . When the instrument is correctly set , the tracing point ,**pencil**, and fulcrum will be in one straight line , as shown by the dotted line in the figure . The motions of ...### Other editions - View all

### Common terms and phrases

26 Spruce St angle rib beam beam compasses bevel breadth Cast Iron circle circumference colatitude constructed copy cube root cubic feet depth describe the arc diagonal diameter divided draw the lines edge Eighths elevation ellipsis extent will reach Figure floor frame girders given line given number gnomonic projection half hypothenuse inches instrument Invented and Drawn jack-rafters Join joists length in feet limb line of chords line of numbers line of sines Lith 26 Spruce meridian method of finding multiplied nail number of degrees number of equal pencil perpendicular plane Plate polygon primary divisions proportional purlin quadrant quarter girt quotient radius regular polygons represent right angles right line roof rule Rule.-Multiply screw secants sector Shows the method slider sliding soffit square root straight line stroke subdivision tangents thickness transverse distance triangle truss vernier scale weight