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"a425couple" wrote in message news:PjFpS.211189$
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Underestimated Arsenal
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The Times of London said her size made her seem to "elude comprehension
and weigh upon the mind."
Isambard Kingdom Brunel had built the largest ship the world had ever
seen: an iron, double-hulled steamship 692 feet long and more than
18,000 tons, with two separate engines turning both paddle wheels and a
screw propeller, and five funnels standing over her deck. She would
remain the largest ship in the world for the next forty-one years, until
the length of RMS Oceanic passed her in 1899.
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Brunel's previous record-breaking ships had been more successful.
https://en.wikipedia.org/wiki/SS_Great_Western https://en.wikipedia.org/wiki/SS_Great_Britain
The limitations of riveted wrought-iron boiler construction and lack of a
good pressure gauge severely limited pressure and engine efficiency. The
first steam engines of 1698 had suffered badly from boiler explosions which kill the operator and anyone else nearby.
The solution for the next hundred plus years was to condense low or zero pressure steam and pull the piston down with vacuum. Watt's contribution was condensing the steam externally to avoid also cooling the cylinder, but he campaigned hard and effectively against raising pressure. Newcomen and
Savery, not Watt, were the fathers of the piston steam engine.
https://blog.rootsofprogress.org/the-newcomen-steam-engine
Steam power was too heavy and inefficient for transportation until around
1800 when English and American inventors Richard Trevithick and Oliver Evans began experimenting with higher pressure, and developing the means to
contain it. Still the boiler pressure control was by weights on a vent which were too easy for the operator to increase.
https://www.bourdon-instruments.com/us/en/company/history-and-innovation/a/history-and-innovation
Coincidentally the introduction of Maudslay's screw-cutting metal lathe in 1797 initiated rapid growth in machining accuracy and capability which
enabled better engines. The mechanically guided slide rest that allowed accurately cutting parallel or perpendicular to the workpiece axis was at least as important as threading. In Watt's time engine cylinder bores could
be chiseled, filed and scraped "round" by hand to the accuracy of a worn shilling. Lathes are very ancient but metal was cut with hand held and
guided chisels as with wood, to similar (lack of) precision.
https://en.wikipedia.org/wiki/Screw-cutting_lathe
My lathe is a 1965 South Bend 10L
https://www.lathes.co.uk/southbend/page4.html
Manually operated lathes have barely changed since the early 1900's; they
got it right back then. Then again carpenter's hand tools haven't changed
much since Jesus learned them from his father, maybe since ancient Egypt.
Furnaces hot enough to melt steel in quantity were developed between 1850
and 1870. Previously "wrought" iron could only be heated hot and soft enough to forge-weld together by hammering, like taffy, with the potential for internal voids to fail later, like in mid-ocean. "Wrought" meant hammered
into shape.
https://en.wikipedia.org/wiki/Bloomery
"Inside the furnace, carbon monoxide from the incomplete combustion of the charcoal reduces the iron oxides in the ore to metallic iron without melting the ore; this allows the bloomery to operate at lower temperatures than the melting temperature of the ore. As the desired product of a bloomery is iron that is easily forgeable, it requires a low carbon content."
Steel was difficult and costly to make and production was low.
https://en.wikipedia.org/wiki/Crucible_steel
Those who claimed the steel in the WTC must have melted have never tried blacksmithing. Steel becomes quite soft and weak at half its melting temperature. I've straightened a truck coil spring by hand at yellow heat, around 2000F. You can demonstrate this by heating a straightened paper clip red hot, ~1500F, in a candle flame. Molten steel at over 2500F glows like a bare light bulb filament, welders need almost solar eclipse level eye protection.
https://www.autodrill.com/resources/charts/melting-points-of-common-metals-fahrenheit
Wrought iron is nearly pure iron metal, thus its high melting point. The
added carbon that converts it into hardenable steel lowers the melting
point, the way salt lowers the freezing point of water. Cast iron is
saturated with carbon. Nitrogen which is 78% of air cools a coal file below iron's melting point, so steel making furnaces preheat the incoming air to 1000F or more to compensate.
That's the short version.
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