Presumably, as they were carrying out repairs, the inside of the
tunnel was bigger than normal and they were able to extract the part
from it.
For some reason I did not receive your post about No 172 Graham. But
it is a cracking shot: the circle on the bank repeated by the circle
of the tunnel and the (implied) circle from the curve of the bridge.
And, because you used such a wideangle lens you have the feeling of
encirclement of the whole scene by the lens. This not to mention the
sharpness and delightful contrast of the whole image.
Did you have to lie in wait for the narrowboat, or was it a
travelling companion which you had charmed into the shot? ;-)
Chris
~~ >-)-
C M I Barker
Cambridgeshire, Great Britain.
+44 (0)7092 251126
www.threeshoes.co.uk
homepage.mac.com/zuiko
On 7 Jun 2005, at 05:01, Brian Swale wrote:
>
> Hi all
>
> Graham wrote
>
>>
>> The circle on the bank is a section from the middle tunnel removed
>> during
>> repairs. The protrusions on the inner circle mark the water level. It
>> doesn't look deep enough for long boats, high enough for headroom
>> or wide
>> enough for two boats to pass but all three are obviously factored in.
>>
>> Olympus OM2 SP : Zuiko 21mm f2 : green filter : Kodak T400CN
>> http://www.geebeephoto.com/2005/05172.htm
>> Graham
>> http://geebeephoto.com
>>
>
> Now, I'm no mathematician, but I can visualise things very well.
>
> If that thing on the bank is a circle, and it looks like it, and it
> once was part
> of the inside wall of the tunnel, presumably the rest of the tunnel
> has the
> same set of dimensions. In order to extract it from the tunnel,
> the inside
> diameter of the tunnel would have to be not only equal to the exterior
> diameter of the ring, but actually slightly larger.
>
> So that supposition appears to be a physical impossibility, unless the
> section was removed vertically through a hole from above..
>
> Interesting problem.
>
> Brian
>
>
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