Front Cover of Volume 14
Volume 14
by R Greenhalgh (Ed)
Published by Pitman & Sons Ltd
16th April 1927
No ISBN number
Extract from page 651
Segmental Arch
The procedure is similar to that of the semicircular arch, but as the curve is less than a semicircle, the centre will lie below the springing line
Mark off the rise on the centre line above the springing line, and join this point with the diagonal A B to the springing point, then bisect the line AB
Proceed with the marking of the voussoirs as described for the semicircular arch. The two outside radial lines will give the skewback, and the mould is obtained in the same manner as for the semicircular arch
The procedure is similar to that of the semicircular arch, but as the curve is less than a semicircle, the centre will lie below the springing line
Mark off the rise on the centre line above the springing line, and join this point with the diagonal A B to the springing point, then bisect the line AB
Segmental Arch
Fig. 54 - Volume 14, page 650
The bisector produced will cut the centre line at a point that will be the centre of a curve passing through the points A and BFig. 54 - Volume 14, page 650
Proceed with the marking of the voussoirs as described for the semicircular arch. The two outside radial lines will give the skewback, and the mould is obtained in the same manner as for the semicircular arch
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