- Hard metal - Highly carbonized iron, the direct product of the blast
furnace; -- used for making castings, and for conversion into wrought
iron and steel. It can not be welded or forged, is brittle, and
sometimes very hard. Besides carbon, it contains sulphur, phosphorus,
silica, etc.
- A rare element of the chromium group, occurring in
nature in the minerals molybdenite and wulfenite, and when reduced
obtained as a hard, silver-white, difficulty fusible metal. Symbol Mo.
Atomic weight 95.9.
- Element, Mn - Metallic element - An element obtained by reduction of its oxide, as a
hard, grayish white metal, fusible with difficulty, but easily
oxidized. Its ores occur abundantly in nature as the minerals
pyrolusite, manganite, etc. Symbol Mn. Atomic weight 54.8.
- seal with oakum - To drive tarred oakum into the seams between the planks of
(a ship, boat, etc.), to prevent leaking. The calking is completed by
smearing the seams with melted pitch. - To make an indentation in the edge of a metal plate, as
along a seam in a steam boiler or an iron ship, to force the edge of
the upper plate hard against the lower and so fill the crevice. - To copy, as a drawing, by rubbing the back of it with red
or black chalk, and then passing a blunt style or needle over the
lines, so as to leave a tracing on the paper or other thing against
which it is laid or held. - A sharp-pointed piece of iron or steel projecting downward on
the shoe of a horse or an ox, to prevent the animal from slipping; --
called also calker, calkin. - An instrument with sharp points, worn on the sole of a shoe
or boot, to prevent slipping. - To furnish with calks, to prevent slipping on ice; as, to
calk the shoes of a horse or an ox.