Buttress of Blocks Small 257×320 Medium 514×640 Large 823×1024 Download Tiff Original 1928×2400 | (232.1 KB) Description Uniting the theories of partial polygons of resistance and centres and lines of resistance, this buttress of blocks illustrates the tangential curve that is the line of pressures. Keywords continuous, force, joint, plane joint, polygon, polygons, pressure, resistance, succession, tangent Galleries General Geometric Illustrations Source: Encyclopaedia Britannica (New York: The Encyclopaedia Britannica Company, 1910) 17:995