## How To Hang A Ledge And Brace Door

The collar beam will, unless the roof settles or spreads, be in compression bat, as the latter contingency may possibly occur, it will be better to provide for its becoming a tie beam by tenoning it to the principal rafters and securing these with inns or iron straps. Not much difficulty will be experienced in making this drawing. Set off the walls to the given span, bisect the span and erect a centre line. Draw the corbels resting on the springing line, and with a radius of 19 ft. describe the...

## How To Draw Perspective Projection

And touching the latter in point a, which becomes the centre of vision. Project this point to a line drawn parallel J distant 12 ft., to scale, locating the stationpoint thereon. From this point draw lines parallel with the sides of the frame a d and a-b, intersecting the H.L., which locate thereon the left-hand and right-hand vanishing points respectively. Draw the ground line G.L. 5 ft. below the ILL. and parallel therewith this locates the picture plane, upon which we can now produce the...

## Theory Of Isometric Projection

With wbirh wc can read off dimensions in the same manner that dimensions are read upon an ordinary scale in orthographic. drawings. The above is Parish's method, but the same results maybe obtained in a simpler manner, as shown in Fig. 2. Here two lines are drawn upon the base line A-D, having angles of 450 and 30 respectively between them. The true scale is plotted upon the 45 angle line A-B, and the divisions projected as before upon the 30 line A-C, which becomes the reduced or isometric...

## Panelled Door Drawing Section Elevation

Horns arc left on for fixings at the head and in. iron plugs driven in the feet of the jambs for fixing iu the stone sill. Commence with the plan, drawing the stile,s of the door first to the given dimensions. Construct the frame around these, drawing the sight lines first, in. within the edges of the door. Divide up the panel equally next the vertical section at a convenient distance from the boundary of the elevation, the position of which can be seen in the plan. Hero, first draw in height...

## Elliptical Curve Cone

By bricklayers for setting out templets for wliat they describe as elliptic arches. Draw the span or major axis A-A. Divide this into three equal parts, in points 1-2. With these points as centres, and 2-A as radius, describe circles intersecting in point 3. Draw lines trom the intersection through points 1 and 2 to cut the circles, and these give the radius for describing the central part of the curve, the two ends being formed by segments of the circles already drawn. It will be seen that...