Cyclopedia of Architecture, Carpentry and Building: Mechanical drawing. Architectural lettering. Architectural drawing

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American Technical Society, 1909 - Architecture

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Page 51 - A Circle is a plane figure bounded by a curved line every point of which is equally distant from a point within called the center.
Page 58 - Problems 3 and 4. To draw through a given point a line parallel to a given line. First Method. Draw the straight line AC about 3| inches long and assume the point P about 1 ^ inches above A C. Through the point P draw an oblique line FE forming any convenient angle —about 60 degrees — with A C.
Page 106 - The horizontal projections of the contour elements will be found in a horizontal line passing through the center of the base; hence the horizontal projection of c and d will be found on this center line, and will be the extreme ends of the curve.
Page 25 - In laying out plates, all work is first done in pencil and afterward inked or traced on tracing cloth. The first few plates of this course are to be done in pencil and then inked ; later the subject of tracing and the process of making blue prints will be taken up. Every beginner should practice with his instruments until he can use them with accuracy and skill, and until he understands thoroughly what instrument should be used for making a given line.
Page 122 - The plan remains the same, except as regards position; while the elevation, obtained by projecting across from the previous elevation, gives the isometrical projection of the cube. The front face is now at the left. In the last position, as one diagonal is perpendicular to V, it follows that all the faces of the cube make equal angles with V, hence are projected on that plane as equal parallelograms. For the same reason all the edges of the cube are projected in elevation in equal lengths, but, being...
Page 42 - Through the center I draw the construction lines HIT and RIP forming angles of 30 degrees with the horizontal. Now adjust the compasses to draw circles having a radius of one inch. With I as a center, draw the circle HPT R. With the same radius (one inch ) draw the arcs with centers at A, B, C and D. Also draw the semi-circles with centers at L, F, M and E. Now draw the arcs as shown having centers at the centers of the small squares ALIE, LBFI, etc.
Page 106 - The length of this element is taken from the elevation A, of either contour element. All of the elements of the cone are of the same length, so when the cone is rolled each point of the base as it touches the plane will be at the same distance from the vertex. From this it follows that the development of the base will be the arc of a circle of radius equal to the length of an element. To find the length of this arc which is equal to the distance around the base, divide the plan of the circumference...
Page 149 - Blue Printing. The tracing, of course, cannot be sent into the shop for the workmen to use, as it would soon become soiled and in time destroyed, so that it is necessary to have some cheap and rapid means of making copies from it. These copies are made by the process of blue printing in which the tracing is used in a manner similar to the use made of a negative in photography. Almost all drafting rooms have a frame for the purpose of making blue prints. These frames are made in many styles, some...

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