HEDGEHOG n.
g caterpillar (Zoöl.), the hairy larvæ of several species of bombycid moths, as of the Isabella moth. It curls up like a hedgehog when disturbed. See Woolly bear, and Isabella moth. -- Hedgehog fish (Zoöl.), any spinose plectognath fish, esp. of the genus Diodon; the porcupine fish. -- Hedgehog grass (Bot.), a grass…
HOPPER n.
ructed as to discharge its load by a mechanical contrivance; -- called also dumping scow. Bell and hopper (Metal.), the apparatus at the top of a blast furnace, through which the charge is introduced, while the gases are retained. -- Hopper boy, a rake in a mill, moving in a circle to spread meal for drying, and to dr…
HYDROSTATIC; HYDROSTATICAL a.
ascertaining their specific gravities. -- Hydrostatic bed, a water bed. -- Hydrostatic bellows, an apparatus consisting of a water-tight bellowslike case with a long, upright tube, into which water may be poured to illustrate the hydrostatic paradox. -- Hydrostatic paradox, the proposition in hydrostatics that any…