Descriptive catalogue of the woods commonly employed in this country for the mechanical and ornamental arts (1852)
London : Holtzapffel · leaf 69
56 MODES OE CLAMPING WIDE BOARDS. If the clamp G, H, were fixed by tenons, (one of which i , j, is shown detached in fig. 22,) the contraction of the part of the … board between the tenons might cause it to split, the distance between the mortises in G, H, being unalterable : or the swelling of the board might cause it to bulge, and become rounding ; or the entire frame would twist and warp, as the expansion of the center might be more powerful than the…
Wood -- Identification · Woodwork -- Great Britain
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
