a foot rule, hinged in the middle, having a spirit level in one section and a graduated arc from which the angle made by the two sections can be read.
[ 1720-30 ]
a foot rule, hinged in the middle, having a spirit level in one section and a graduated arc from which the angle made by the two sections can be read.
[ 1720-30 ]
Random House Webster's Unabridged English dictionary. Полный английский словарь Вебстер - Random House . 2012