“The people of very early times may have used machines in primitive ways. As mankind discovered new uses for them, it was able to move from primitive to more civilized ways of living. And the history of civilization almost parallels the ever-widening and ever-wiser use of machines. But, as we learn in this How and Why Wonder Book, no matter how complex today’s machines appear, they are really combinations of two or more of the six simple ones - the lever, the inclined plane, the wedge, the screw, the wheel and axle, and the pulley.”
Paperback, gentle vintage wear, tanned pages, gift inscription. Slight musty smell.
“The people of very early times may have used machines in primitive ways. As mankind discovered new uses for them, it was able to move from primitive to more civilized ways of living. And the history of civilization almost parallels the ever-widening and ever-wiser use of machines. But, as we learn in this How and Why Wonder Book, no matter how complex today’s machines appear, they are really combinations of two or more of the six simple ones - the lever, the inclined plane, the wedge, the screw, the wheel and axle, and the pulley.”
Paperback, gentle vintage wear, tanned pages, gift inscription. Slight musty smell.
