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"The piston rods are furnished with racks, or teeth, and are worked by the toothed wheel a, which is turned backwards and forwards, by the lever and handle b. The exhaustion pipe c, leads to the plate on which the receiver stants. The valves v, n, u, and m, all open upwards." —Comstock, 1850

Air Pump

"The piston rods are furnished with racks, or teeth, and are worked by the toothed wheel a, which is…

"Marginal forms of leaves: a- serrate, or saw-toothed. b- dentate, or toothed. c- crenate, or scalloped. d- repand, undulate, or wavy. e- sinuate. f- incised, cut or jagged." -Foster, 1921

Leaf Margins

"Marginal forms of leaves: a- serrate, or saw-toothed. b- dentate, or toothed. c- crenate, or scalloped.…