JB/539/280/001

Click Here To Edit

of salt are is pumped up are very small on account of the labour there
is in boring holes to so great a depth which labour would be encreased
were they to be made larger. These pumps though kept constantly going
never exhaust the solution. He wants to get up more of this solution:
to make more holes is the work of 2 or 3 years. I told him
that "without increasing the bore of these pipes through which
the solution is raised, and without encreasing the velocity with which it
passes through the pipes I w could make exactly twice the quantity
of solution to be raised up." This appeared to him as it would
most likely have done to me as a thing absolutely impossible.
Least it should appear so to you I'll let you into the secret. It is a
sucking pump that is used and you know that such pumps void
the fluid intermittently [the stroke must be fetched ] It is where the
piston moves upwards only that the water is raised, when it descends
the water in the pipe below is at rest. These intermissions during
which the water are at rest are far for the same length of time as
those during which the water is raised. I mean to make the upper
part of the pump double, so that there will be 2 pistons moving in 2
pipes which terminate in one pipe at the fixed valve. These two pistons
will work alternately one ascending while the other descends, Since the fluid
in the long pipe below instead of being at rest half the time will
flow up in a perpetual stream as it will have to supply alternately
each of the two moving pistons and thus twice the quantity of fluid will
come up without the velocity or diam r being encreased. Perhaps you will say but
this: I make two pumps tis true tha what is above ground and to a certain

Identifier: | JB/539/280/001 "JB/" can not be assigned to a declared number type with value 539.
Date_1	1782-01-2	Marginal Summary Numbering
Box	539	Main Headings
Folio number	280	Info in main headings field
Image	001	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