3. A similar reasoning may be applied to lamps. An Argand burner,
whether used for consuming oil or gas, admits almost an unlimited
quantity of air. It would deserve enquiry, whether a smaller
quantity might not produce greater light; and, possibly, a
different supply furnish more heat with the same expenditure of
fuel.
4. Deutoxide of hydrogen, the oxygenated water of Thenard.
Chapter 25
Enquiries Previous to Commencing any Manufactory
298. There are many enquiries which ought always to be made
previous to the commencement of the manufacture of any new
article. These chiefly relate to the expense of tools, machinery,
raw materials, and all the outgoings necessary for its
production; to the extent of demand which is likely to arise; to
the time in which the circulating capital will be replaced; and
to the quickness or slowness with which the new article will
supersede those already in use.
299. The expense of tools and of new machines will be more
difficult to ascertain, in proportion as they differ from those
already employed; but the variety in constant use in our various
manufactories, is such, that few inventions now occur in which
considerable resemblance may not be traced to others already
constructed.
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