ClipArt ETC
"A bird in the hand is worth two in the bush." Its better to have a small advantage rather than a greater one. -Trowbridge, 1866

Advantage Rebus

"A bird in the hand is worth two in the bush." Its better to have a small advantage rather than a greater…

"...the mechanical advantage of this machine (wheel and axle) equal the ratio between the radii, diameters, or circumferences of the wheel and of the axle." -Avery 1895

Wheel and Axle with Rope and Bucket

"...the mechanical advantage of this machine (wheel and axle) equal the ratio between the radii, diameters,…