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The prefix h or hecto indicates the unit should be multiplied by 102.
See also: Decimal Prefixes.
A few notes on using a hacksaw.
A dead center that has a portion of the 60 degree cone cut away.
See also: Centres.
The hole should be pre-drilled with an allowance of < 0.2 mm (.008 in) for soft materials and < 0.13 mm (.005 in) for hard materials.
See also: Colour Temperatures.
If a temperature difference exists between two points heat will flow from the point at the higher temperature to the point at the lower temperature. This flow will continue until equilibrium has been reached. more......
See also: Colour Temperatures.
See: Heat.
See: Heat.
56 % Copper 44 % Nickel
67 % Copper 31 % Zinc 2 % Aluminium
Frequency in cycles per second. Named after H.R. Hertz, the German scientist who discovered electrical oscillations. In the case of Alternating Current the frequency is 60 hz in North America and 50 hz in the UK and the rest of the World.
Carbon content greater than 0.85%.
A hard steel used for metal cutting tools as it remains hard even at dull red temperatures. It normally contains:
Tungsten 12 to 18%, Chromium up to 5% and Carbon 0.4 to 0.7%. more...
An engine where the speed is governed by holding the exhaust port open and decompressing the engine when the speed goes too high, as the speed drops the exhaust is closed and the engine then draws air and fuel into the cylinder via the intake valve. Hence the engine "misses" when the speed goes to high and "hits" when the speed drops.
The photo shows a hit and miss engine built by Mick Cherry, learn more here.
90 % Nickel 10 % Chromium
42.3 % Lead 46.15 % Tin 11.53 % Antimony
Trade name: Bauxite
Chemical formula: Al2O32H2O
See also: Chemical Table.
Trade name: Soda ash
Chemical formula: Na2CO3 10H2O
See also: Chemical Table.
Chemical formula: HCl
See also: Chemical Table.
Chemical formula: HF
See also: Chemical Table.
Trade name: Prussic acid
Chemical formula: HCN
See also: Chemical Table.
Chemical formula: H2S
See also: Chemical Table.
Used in high performance engines as it has a lower coefficient of thermal expansion and so means tighter tolerances.
See also: Pistons
50 % Nickel 50 % Iron