Appletons' Cyclopędia of Technical Drawing: Embracing the Principles of Construction as Applied to Practical Design

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William Ezra Worthen
D. Appleton, 1892 - Mechanical drawing - 745 pages
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Page 601 - The two great rules for design are these: 1st, that there should be no features about a building which are not necessary for convenience, construction, or propriety; 2nd, that all ornament should consist of enrichment of the essential construction of the building.
Page 669 - The said anchors shall be built into the side or party walls not less than sixteen inches, and into the front and rear walls at least...
Page 668 - STRENGTH OF TEMPORARY SUPPORTS. Every temporary support placed under any structure, wall, girder or beam, during the erection, finishing, alteration, or repairing of any building or structure or any part thereof, shall be of sufficient strength to safely carry the load to be placed thereon. CHAPTER XXII. CALCULATIONS— STRENGTH OF MATERIALS. SECTION 131.
Page 671 - In all calculations for the strength of materials to be used in any building, the proportion between the safe weight and the breaking weight shall be as one to three for all beams, girders, and other pieces subjected to a...
Page 58 - The following method of mounting and varnishing drawings or prints was communicated some years ago by Mr. Peacock, an artist of Dublin. Stretch a piece of linen on a frame, to which give a coat of isinglass or common size. Paste the back of the drawing, leave it to soak, and then lay it on the linen. When dry, give it at least four coats of well-made isinglass size, allowing it to dry between each coat. Take Canada balsam diluted with the best oil of turpentine, and with a clean brush give it a full...
Page 57 - ... as to admit of being afterwards cut from the board, leaving the border by which it is attached thereto by glue or paste, as we shall next explain. The paper must first be thoroughly and equally damped with a sponge and clean water, on the opposite side from that on which the drawing is to be made. When the paper absorbs the water, which may be seen by the wetted side becoming dim, as its surface is viewed slantwise against the light, it is to be laid on the drawing board with the wetted side...
Page 671 - ... to be used in any building, the proportion between the safe weight and the breaking weight shall be as one to three, for all beams, girders and other pieces subjected to a cross strain ; and as one to six for all posts, columns and other vertical...
Page 671 - Every column, post or other vertical support shall be of sufficient strength to bear safely the weight of the portion of each and every floor depending upon it for support, in addition to the weight required as before stated to be supported safely upon said portions of said floors. Reduction in Live Loads on Columns. For the purpose of determining the carrying capacity of columns in dwellings, office buildings, stores, stables and public buildings when over five stories...
Page 22 - Inversely, an equilateral triangle may be inscribed by joining the alternate points of division found for a hexagon. The constructions for inscribing regular polygons in circles are suitable also for dividing the circumference of a circle into a number of equal parts. To supply a means of dividing the circumference into any number of parts, including cases not provided for in the foregoing problems, the annexed table of angles relating to polygons, expressed in degrees, will be found of general utility....
Page 51 - ... &c., backwards from right to left Then, since the extent of eleven subdivisions has been divided into ten equal parts, so that these ten parts exceed by one subdivision the extent of ten subdivisions, each one of these equal parts, or, as it may be called, one division of the vernier scale, exceeds one of the subdivisions by a tenth part of a subdivision, or a hundredth part of a primary division. In our figure the distances between the primary divisions are each one inch...

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