poses one of the liquid " carbon " inks is generally used, as giving a more intense black. Ordinary writing ink should on no account be used, as it is too fluid to give sufficient depth of tone. A cardboard set square cut to the required " pitch " will be found useful for setting out the sloping letters.
Chapxek V ORTHOGRAPHIC PROJECTION
Production of PLANS, ELEVATIONS and SECTIONS
Scope of the Chapter— theory of orthographic projection. 1 "rejection upon three J'lanes - Examples. A I)warl Cupboard-preparation of the plan, projecting the elevation, determining the section. A Field Gate—how to draw it. Types of Roofs- -Couple and Couple Close, Collar bolt and tie, King I'ost; spacing of trusses. A Laminated Iiih Roof- -detail., oi construction, method of drawing. Doors- -framed, ledged and braced, con struction ot, preparing the drawings, i'anelleu Doors- -how specified. A Diminished Stile Door. Floors- a single floor with details, arrangement of briugers and trimmers. Windows •—Cased Sash irainos, common and superior, constructional details, method of drawing. French Casement Frames—details of construction. Shop F'ittings —a draper's counter, method of construction. Important points in Technical Drawing. An Octagonal Ogee Root—dimensions, how to set out the plan, how to obtain moulds for ribs, projecting the elevation. Lantern Lights—definition and description of, an examination question, a solution with details of construction. A Circle-on-Circle Entrance Door and Frame— an i.nusu£.l loim, instructions tor projecting the vertical section; obtaining solfit mould, face mould, etc.
In this chapter it is proposed to instruct the student, by means oi graduated examples of various objects drawn from the field of carpentry, joinery, brickwork and masonry, how to prepare plans, elevations, sections and details of construction of several parts of a building and its fittings, thus enabling him to reproduce accurately these copies, as well as more ad\anced ones that may be contained in other works.
In the first lesson it is assumed that the student knows
Theory of Orthographic Projection
Fig. I. View of the Co-ordinate Planes in their imaginary relation to the Object. Fig, 2. The Planes developed with Projections of the Object upon them,
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