Circular saw
Invented in
England in
1780, the
circular saw is a
metal disc (or
blade) with
saw teeth on the edge as well as the
machine that causes the disk to spin. It is a
tool for cutting
wood or other materials and may be
hand-held or
table-mounted. Today they are usually powered by electricity, but large ones in "saw mills" (where whole trees are sawed into
lumber) were traditionally powered by
water turning a large paddlewheel.
