## 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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**joining**any two opposite angles of a quadrilateral , Fig . 2 . 36. Plane figures that have more than four sides are generally called polygons , and they receive other particular names according to the number of their sides or angles ... Page 7

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**joining**the extremities of an arc . A segment is any part of a circle bounded by an arc and its chord , Fig . 6 . A semicircle is half the circle , or a segment cut off by a diameter , Fig . 5 ; the half circumference is sometimes ... Page 9

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**Join**AB and B C , and from the point B , with any radius , describe an arc EFG D. From the points A and c , as centres with the same radius , describe arcs cutting the first described arcs at the points EFGD ; through the points of ... Page 10

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**join**E B , and the line thus obtained will be the required perpendicular . Figure 5 . To draw a line making equal angles with two given lines . Let DA , CB , be two converging lines . Draw GH parallel to CB , and IH parallel to D A ... Page 11

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**join**BD , and make B E equal to one third of BD ; make EG perpendicular to BD ; produce the line DC to G , then the points , F and G , with GD and FB for radii , will describe the required ellipsis . Figure 6 . To describe an ellipsis ...### 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