The pulley /
Armentrout, Patricia,
The pulley / Patricia Armentrout. - Vero Beach, Fla. : Rourke Press, c1997. - 24 p. : col. ill. ; - Simple devices .
Includes index.
Text and pictures introduce the pulley, a simple machine used primarily to lift heavy objects.
1571031782
Pulleys
Pulleys.
621.8
The pulley / Patricia Armentrout. - Vero Beach, Fla. : Rourke Press, c1997. - 24 p. : col. ill. ; - Simple devices .
Includes index.
Text and pictures introduce the pulley, a simple machine used primarily to lift heavy objects.
1571031782
Pulleys
Pulleys.
621.8