It
was constructed by M. Floresi, a gentleman well acquainted with
Switzerland.
Chapter 29
On the Duration of Machinery
340. The time during which a machine will continue to perform
its work effectually, will depend chiefly upon the perfection
with which it was originally constructed upon the care taken to
keep it in proper repair, particularly to correct every shake or
looseness in the axes--and upon the smallness of the mass and of
the velocity of its moving parts. Everything approaching to a
blow, all sudden change of direction, is injurious. Engines for
producing power, such as windmills, water-mills, and
steam-engines, usually last a long time.(1*)
341. Many of the improvements which have taken place in
steamengines, have arisen from an improved construction of the
boiler or the fireplace. The following table of the work done by
steam-engines in Cornwall, whilst it proves the importance of
constantly measuring the effects of machinery, shows also the
gradual advance which has been made in the art of constructing
and managing those engines.
A table of the duty performed by steam-engines in Cornwall,
shewing the average of the whole for each year, and also the
average duty of the best engine in each monthly report
Years; Approximate number of engines reported; Average duty of
the whole; Average duty of the best engines
1813; 24; 19,456,000; 26,400,000
1814; 29; 20.
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