Partially oxidized iron (Fe3O2).



Related Terms

MAST CASE

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

PUSH NIPPLE

A push nipple is a smooth piece of pipe, slightly tapered at both ends. Push nipples are used to connect radiator or cast iron boiler sections together, taking advantage of the nipple's taper to create a tight seal. Boilers and radiators whose sections are connected by push nipples make use of tie rods between the sections to hold them together.

SECTIONAL BOILER

A boiler consisting of hollow cast iron sections bolted together.

Manufacture Of Iron

Iron ore is obtained from the earth and consists of iron oxide with impurities. The impurities, which vary in quantity with different ores, are Silica, Alumina, Calcium, Manganese, Phosphorus and Sulphur.

The ore is converted to pig iron in a blast furnace. The furnace is charged with alternate layers of coke, ore and limestone and air at about 1000°F and 15-20 lb/sq in blown through. When the furnace is working normally there is a gradual increase in temperature from top to bottom. Oxygen is removed from the ore and at about 2400°F the metal becomes incandescent and starts to absorb carbon. This lowers the melting point of the metal which now melts rapidly and runs downwards over glowing coke, absorbing more carbon, to the bottom of the furnace where it is tapped off and run into "pigs" or taken directly to the steel making plant. The limestone which is a flux forms a slag which absorbs some of the impurities. The slag lies on top of the molten metal and is tapped off from time to time. Phosphorus and manganese contents are unchanged by slagging.

The pig iron produced contains from 3½% to 4½% of carbon and quantities of Silicon, Sulphur, Phosphorus and Manganese, depending on the quality of the ore.

JOGGLE

A slender triangular recess cut into the faying surface of a frame or steamed timber to fit over the land of clinker planking, or cut into the faying edge of a plank or rebate to avoid feather ends on a strake of planking. The feather end is cut off to produce a nib. The joggle and nib in this case is made wide enough to allow a caulking iron to enter the seam.

STAINLESS STEEL

Non rusting alloy of iron and nickel - marine grade 316, hospitality grade 314.

JACKSTAY

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

WROUGHT IRON

Relatively pure iron produced by puddling pig iron.

DOG IRON

  1. A short iron bar with ends bent at right angles. 2. An iron pin that can be inserted in stone or timber in order to lift it.

FERROUS HYDROXIDE

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

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