plummet
Webster 1828
PLUM'MET, noun [See Plumb.]1. A long piece of lead attached to a line, used in sounding the depth of water.2. An instrument used by carpenters, masons, etc. in adjusting erections to a perpendicular line, and with a square, to determine a horizontal line. It consists of a piece of lead fastened to a line.3. Any weight.4. A piece of lead used by school boys to rule their paper for writing