JB/539/230/002

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condensible, the permanent air super discharged from the water by boiling.

You never tell me any thing about the Davis es.

Call at Nairne's or any where else where you can see some Magnets, and
inquire the weight of each stone, how much it will lift up alone
without being mounted, how much when mounted. What it is worth without
and with the mounting. I may from knowing these particulars of 4
or 5 magnets be able to judge what pains it is worth my
while to take to procure more than I have. If they those which you are of different
sizes I should judge also what size is most prized. Would it one be b very rare
and valuable which should weigh 50 pounds and lift up 150, or weigh
100 lift up 200. I mean when mounted, for it is scarcely possible to
find one that shall lift up 10 pounds without being mounted though
it should weigh 200. In the Encyclopaedia I find Knight (the compass maker I suppose) was proposed of the secret of being able not only
greatly to ag augment the force of all magnets but also to change the
direction of the poles at pleasure. If that secret is known at present
by other mathemat: instrum: makers I could procure some large stones
which by the change of the situation of the poles might from being very
indifferent become very excellent.

You mentioned to me a publication on Cements if you send any parcel to me send me this
also if it is to be had.

1781 } S.B.
Sept } to
1 = 12 } J.B. Linc Inn

Inoft.
Code L. Sh. V.

Identifier: | JB/539/230/002 "JB/" can not be assigned to a declared number type with value 539.
Date_1	1781-09-01	Marginal Summary Numbering
Box	539	Main Headings
Folio number	230	Info in main headings field
Image	002	Titles
Category	Correspondence	Number of Pages
Recto/Verso		Page Numbering
Penner	Samuel Bentham	Watermarks
Marginals		Paper Producer
Corrections		Paper Produced in Year
Notes public		ID Number
Box Contents