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Doc. 53.] 245
POLHEM TO SWEDENBORG .
welcome at my house. With many friendly remembrances,
most worthy Librarian, I am
Your most obedient servant,
CHRISTOPH POLHAMMAR .
Stiernsund, December 10, 1715.
P. S. Would you be kind enough to send back my former
papers, so that I may see what I have heretofore written and
thought upon those things which Mr. Swedberg desires to
bring out. They might be received and brought here by my
boys at Upsal, only they ought to be sealed up in a packet.
DOCUMENT 53.
POLHEM TO SWEDENBORG.*
Noble and most learned Sir,
Most honoured friend,
The copper-plate which you desire is en
tirely at your service ; only you must take the trouble to ask
it from Magister Naclerus, who borrowed it for his disputation,
and has forgotten to return it to me. What you desire to know
about the water-wheel, with regard to its driving power and
velocity, together with several other things, requires more space
for a proper discussion than a mere letter, especially if all is to
be demonstrated by mathematics. In the mechanical laboratory
experiments are made at the expense of the King, on the most
important parts of a a number of things, which agree pretty
well with theory and mathematical computation, especially
since I discovered the cause of the difference, viz. of the re
sistance of mediums and the friction of substances, which have
also their proportions, but the subject of which is too extensive
to be treated of in a letter. But if you wish to apply your
self diligently to the study of mechanics, I should very much
* Polhem’s MSS. in the Benzelius Collection at Linköping, p. 343.
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