ClipArt ETC
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.

Buttress of Blocks

Uniting the theories of partial polygons of resistance and centres and lines of resistance, this buttress…

Ornaments made of blue silk ribbon with a button in the center bearing the image of a palmetto tree. They were worn by ladies of Charleston immediately after the passage of the ordinance of succession.

Palmetto Cockade

Ornaments made of blue silk ribbon with a button in the center bearing the image of a palmetto tree.…