[modeleng] Re: http://www.keveney.com/Atkinson.html
- From: "TEL" <tel47@xxxxxxxxxxx>
- To: <modeleng@xxxxxxxxxxxxx>
- Date: Mon, 19 Nov 2007 21:09:44 +1100
Thanks Shep
> Hi Tel
>
> No - Newcomen never produced an engine producing rotary output.
>
> To quote from Engineering Heritage Vol 1, produced by The Institute of
> Mechanical Engineers, London 1963 - page 63:
>
> "ROTARY MOTION: The early beam engines were suitable only for pumping or
> raising water and the next obvious step was to make them rotary. This
is
> attributed to J Pickard of Birmingham who interposed a connecting rod
> between the far end of the beam and a crank on a shaft placed at about the
> cylinder base level. In spite of his inspiration being, no doubt,
derived
> from the spinning wheel of the period, he obtained a patent for it in
1780.
> Watt overcame this difficulty with the sun-and-planet patent of 1781; the
> sun-wheel keyed to the shaft has meshing with it the planet-wheel rigidly
> fixed at the end of the connecting rod, the twain being kept in mesh by a
> line motion of the former and the curved motion of the latter. Watt
> evolved his straight line or parallel motion, patented in 1784."
>
> Here endeth the first lesson!
>
> Cheers! Hubert.
>
>
> ----- Original Message -----
> From: "TEL" <tel47@xxxxxxxxxxx>
> To: <modeleng@xxxxxxxxxxxxx>
> Sent: Monday, November 19, 2007 6:25 AM
> Subject: [modeleng] Re: http://www.keveney.com/Atkinson.html
>
>
> >I thought Newcomen held the patent at the time?
> >
> >> Jesse
> >>
> >> A man called Pickard patented the crank. James Watt designed the
> >> complicated sun-and-planet motion to circumvent this patent. It is
> >> extraordinary that someone was able to patent the principle of the
crank,
> >> which had been in use for millennia!
> >>
> >> Watt must have been the original model engineer - he tested his theory
of
> > a
> >> separate condenser on a scale model, before making the huge engine.
> >>
> >> Cheers from Hubert in FREEZING St Albans.
> >>
> >> ----- Original Message -----
> >> From: "Jesse Livingston" <fernj1@xxxxxxxxxxxxx>
> >> To: <modeleng@xxxxxxxxxxxxx>
> >> Sent: Sunday, November 18, 2007 3:30 PM
> >> Subject: [modeleng] Re: http://www.keveney.com/Atkinson.html
> >>
> >>
> >> > Dave,
> >> >
> >> > You are correct, it is the Differential engine I was thinking about.
> >> >
> >> > Another attempt at circumventing patents was the "Epicyclical" steam
> >> > engine.
> >> > This was invented, I believe to get around Watts' patent on the
> > crankshaft
> >> > and connecting rod. I have a model here at the house that our son
> >> > built
> > a
> >> > few years ago. Runs quite well, but looks weird as all get out.
> >> >
> >> > Jesse in too warm for November W Tennessee USA.
> >> >
> >> > MODEL ENGINEERING DISCUSSION LIST.
> >> >
> >> > To UNSUBSCRIBE from this list, send a blank email to,
> >> > modeleng-request@xxxxxxxxxxxxx with the word "unsubscribe" in the
> > subject
> >> > line.
> >>
> >> MODEL ENGINEERING DISCUSSION LIST.
> >>
> >> To UNSUBSCRIBE from this list, send a blank email to,
> >> modeleng-request@xxxxxxxxxxxxx with the word "unsubscribe" in the
subject
> > line.
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> >
> > MODEL ENGINEERING DISCUSSION LIST.
> >
> > To UNSUBSCRIBE from this list, send a blank email to,
> > modeleng-request@xxxxxxxxxxxxx with the word "unsubscribe" in the
subject
> > line.
>
> MODEL ENGINEERING DISCUSSION LIST.
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> To UNSUBSCRIBE from this list, send a blank email to,
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