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Doc. 66.] 271
POLHEM TO SWEDENBORG .
Your arrival in Stiernsund will be most agreeable to me,
and if my experience can be of any use to you, I will give
it with so much the greater pleasure, as the fruit of it will
be of use to the public and will accrue to my own honour.
After you enter upon physics, it might be useful to follow
them up for some time more extensively, especially those which
concern the causes of natural things, and also all other things
necessary and curious, especially those of the household, etc.
Immediately after I sent off my letter to you, I received
yours. My wife and children desire to be remembered to you
most kindly, and they also thank you for your compliments.
I remain, most respected sir,
Your most dutiful,
CHRISTOPH POLLHEIMER.
Stiernsund, September 5.
DOCUMENT 66.
POLHEM TO SWEDENBORG.*
Noble and most learned Sir.
My good friend,
Your letter of the 4th September was received.
With respect to the computations for the fall of water for
wheels, pipes, and all sorts of works and machines, they
require more explanations than can be given in a letter ;
especially as each case has many circumstances peculiar to
itself, so that, although they have altogether their certain
rules and demonstrations, as well mathematical, as physical
and mechanical, there is still scarcely any rule so perfect
that it has not its exceptions under certain contingencies.
For instance, although the rule is generally known, by which
to produce the greatest effect by means of a wheel, both in re
spect to time and expenditure of force, which rule must be care
* Polhem’s MSS, in the Benzelius Collection, p. 371.
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