ClipArt ETC
"The common chipping-knife, used by apothecaries, and represented [here], is a familiar illustration of levers of the second kind [class]." —Quackenbos 1859

Chipping Knife

"The common chipping-knife, used by apothecaries, and represented [here], is a familiar illustration…

"... shows one of the commonest (sic) forms in which this kind of lever appears,-the crowbar. The power is applied at the handle. The weight is at the other end, and consists of something to be moved. The fulcrum is a stone on which the crowbar rests." —Quackenbos 1859

Crowbar

"... shows one of the commonest (sic) forms in which this kind of lever appears,-the crowbar. The power…

A lever of the first class

First Class Lever

A lever of the first class

"A Lever of the First Kind is one in which the fulcrum is between the power and the weight... where F represents the fulcrum, P the power, and W the weight." —Quackenbos 1859

First Class Lever

"A Lever of the First Kind is one in which the fulcrum is between the power and the weight... where…

"With crutches broke the cripple cannot go; / One that is close of sight doth pity the show; / The one that's lame, hath vision strong and clear, / He sees all dangers round, both far and near; / The one who's vision's dim, is hale and strong, / He carries the other with ease along: / By doing thus, an action, noble, kind, / Will to himself a greater blessing find."—Barber, 1857

He that Helps Another, Helps Himself

"With crutches broke the cripple cannot go; / One that is close of sight doth pity the show; / The one…

"In the second order of levers, the resistance is between the fulcrum and the power; and, as before, P : W :: BF : AF, but the pressure of the fulcrum is equal to W-P, or the weight less the power."—Pettigrew, 1874

Second Kind of Lever

"In the second order of levers, the resistance is between the fulcrum and the power; and, as before,…

"In the third order of lever the power acts between the prop and the resistance, where also P : W :: BF : AF, and the pressure on the fulcrum is P-W, or the power less the weight."——Pettigrew, 1874

Third Kind of Lever

"In the third order of lever the power acts between the prop and the resistance, where also P : W ::…

Dryer weed from canada and parts of the United States, they bear yellow flowers.

Solidago Nemoralis

Dryer weed from canada and parts of the United States, they bear yellow flowers.

"A Lever of the Second Kind is one in which the weight is between the power and the fulcrum." —Quackenbos 1859

Second Class Lever

"A Lever of the Second Kind is one in which the weight is between the power and the fulcrum." —Quackenbos…

"A Lever of the Third Kind is one in which the power is between the weight and the fulcrum." —Quackenbos 1859

Third Class Lever

"A Lever of the Third Kind is one in which the power is between the weight and the fulcrum." —Quackenbos…