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A sedimentary rock consisting mostly of calcium carbonate that is used to remove the impurities produced refining iron ore.

Related Terms

HARD IRON

Iron or steel which is not readily magnetized by induction, but which retains a high percentage of the magnetism acquired

FERRIC ION

An iron atom that has a positive electric charge of +3. (Fe2+)

FERROUS HYDROXIDE

The reaction product of iron and water in the absence of oxygen; it remains soluble in the water Fe(OH)2.

INDUCED MAGNETISM

The magnetism acquired by soft iron while it is in a magnetic field. Soft iron will lose its induced magnetism when it is removed from a magnetic field. The strength and polarity of the induced magnetism will alter immediately as its magnetic latitude, or its orientation in a magnetic field, is changed. The induced mag- netism has an immediate effect upon the magnetic compass as the magnetic latitude or heading of a craft changes.

PAWLS

Iron fingers that click into notches in the barrel on a winch to prevent roll-back.

MUZZLE

An iron ban around the mast to hold the heel of the sprit.

JACKSTAY

An iron rod bolted clear of the mainmast, to which the luff of the mainsail is laced.

MAST CASE

A yatchsmans tabernacle. The iron fitting in which the heel of the mast is mounted.

SPIDER HOOP

An iron band around the base of a mast which holds a set of iron belaying pins.

OREBOAT

A great lakes term for a vessel primarily used in the transport of iron ore.
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