The New Student's Reference Work/Auxanometer
Aux′anom′eter. A device for measuring the growth of plants during short periods, when it is too slight readily to admit of direct measurement. In all forms the growth is magnified by causing the plant, acting on the short arm of a lever or the hub of a wheel, to displace an index five to twenty times more than the actual movement. (See figure.) In the more elaborate forms the index registers its movements on a smoked surface.