Memoir of a mechanic Being a sketch of the life of Timothy Claxton . [Large Air-pump.] This contrivance was a great desideratum, forsome years before it was accomplished. Butin 1834, the medium sized pump was com- 78 MEMOIR OF A MECHANIC. pletedj and a patent obtained for it; and im-mediately after, the large pump was improvedby means suggested while finishing the port-able one. These pumps are worked by asimple lever ; and the barrel moves, while thepiston is stationary. Both valves are attachedto the piston. The barrel is completely closedat the bottom, and the exhaustion is performedby the
Memoir of a mechanic Being a sketch of the life of Timothy Claxton . [Large Air-pump.] This contrivance was a great desideratum, forsome years before it was accomplished. Butin 1834, the medium sized pump was com- 78 MEMOIR OF A MECHANIC. pletedj and a patent obtained for it; and im-mediately after, the large pump was improvedby means suggested while finishing the port-able one. These pumps are worked by asimple lever ; and the barrel moves, while thepiston is stationary. Both valves are attachedto the piston. The barrel is completely closedat the bottom, and the exhaustion is performedby the downward action of the lever, pressingthe pump down upon the table or floor onwhich it stands, while the upward motion isgreatly assisted by the pressure of the atmos-phere. Thas the difficulty so long felt, offastening large pumps down, and of keepingthem steady while in action, is [Medium sized Air-pump.] INVENTIONS. 79 Passing over a number of minor articles,which, though useful, it might be tedious todescribe here, 1 will conclude my remarks onthis part of the subject by giving an accountof an invention of mine of quite a differentcharacter.—About seven or eight years ago, 1was applied to by the agent of the New Eng-land Glass Bottle Company, about a machineto try the strength of porter and other had seen a notice in a scientific periodical,of a machine invented in France for this pur-pose, but without any description; and he hadno idea how it should be made. I told himthat I had as much as I could do in attendingto my own inventions ; but I would think thesubject over, and if 1 did not make the machine,I was willing to give the person who mightmake it the results of my thoughts on the sub-ject. I matured a plan, and after considerablesolicitation, made the machine myself, whichhad the effect of helping the company out oftheir difficulty; for upo
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