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Kit
See the ODOMETER of Vitruvius (De Architectura) 27 / 23 BC. Odometer from
Greek Odos , road, Metreo, to measure.
See also Johon F. Brok: (www.fig.net/pub/cairo/wshs_02/wshs=2_01_brok.pdf)
Giulio
________________________________
Da: Virginia R Hetrick PhD <[email protected]>
A: Discussion group for map history <[email protected]>
Inviato: Martedì 3 Maggio 2011 3:43
Oggetto: Re: [MapHist] Request for illustration
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Hi, Kit -
I don't know the official way, but a simple way would be to determine
the circumference of one wheel (or trail a fifth wheel along behind,
connected by a rod or rods to be back of the coach or carriage). Mark
the wheel on its side (doing it on the actual rolling surface will
just about insure that it will be wiped out during the measuring and
start with the mark on the ground at the point where you want to
measure from. Then, let your horse (dog or pony or other draft
animal) proceed along the path you want to measure. On the way to
your destination count the number of times your mark hit the ground.
When you get to the destination point, mark the wheel in some
different way. You're then left with the task of measuring the
distance on the circumference from the original mark to the point
where the wheel hits the ground to end the measurement.
As I say, I don't know whether that's official, but it ought to be
pretty close. The formula most of us learned in school is c = pi*d,
but c = 2*pi*r is easier because it's easier to measure one radius
than the diameter which is difficult because often people don't
remember to run their measuring device through the exact center of the
hub of the wheel. The c will be the same unit of measure as the r or
the d, such as inches, centimeters, or meters.
v
On Mon, May 2, 2011 at 9:14 AM, <[email protected]> wrote:
> This is a MapHist list message (when you hit 'reply' you're replying to the
> whole list)
> o + o + o + o + o + o + o + o + o + o + o + o + o + o + o + o + o + o + o +
>
>
> Hi!
>
> For a presentation I require an illustration of a coach or carriage as it
> might be used for measuring distances. There is an image in Methodus
> geometrica (Paul Pfinzing) for example. Unfortunately I do not have access to
> a copy that I could photocopy or scan. If anyone has an image of such a coach
> that might have been used circa 1750 I would be very grateful.
>
> Please send to me at my email address - not to the list. If anyone else is
> interested I will send it on if they let me know.
>
> Many thanks
>
> Kit Batten
>
> This email has been sent to you by:
> Kit Batten
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--
-------------------------------------------------------------
Virginia R. Hetrick, here in sunny California
Email: [email protected]
"There is always hope."
My fave: http://www.washington.edu/cambots/camera1_l.gif
There's no place like: 34N 8' 25.40", 117W 58'5.36"
if you can't be at: 48N 6' 59.9" 122W 59' 54.2"
-------------------------------------------------------------
_______________________________________________
MapHist: E-mail discussion group on the history of cartography
hosted by the Faculty of Geosciences, University of Utrecht.
The statements and opinions expressed in this message are those of
the author and do not necessarily reflect those of the University of
Utrecht. The University of Utrecht does not take any responsibility for
the views of the author.
List Information: http://www.maphist.nl
Maphist mailing list
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http://mailman.geo.uu.nl/mailman/listinfo/maphist
_______________________________________________
MapHist: E-mail discussion group on the history of cartography
hosted by the Faculty of Geosciences, University of Utrecht.
The statements and opinions expressed in this message are those of
the author and do not necessarily reflect those of the University of
Utrecht. The University of Utrecht does not take any responsibility for
the views of the author.
List Information: http://www.maphist.nl
Maphist mailing list
[email protected]
http://mailman.geo.uu.nl/mailman/listinfo/maphist
