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James Jameson contributed to discussions at an
Edinburgh Photographic Society meeting on 1 February 1882, describing
his method of spraying the outside of his studio to cool the air
within.
[BJP:
1882, p.82].
He
said:
"We
had a few years ago a paper and pretty lively discussion on ventilators
[1] and it was remarked then that when there was no wind to work them we
must send a boy to the top of the house to blow with a pair of bellows.
If
we have not a boy to send we must employ some other motive power, and it
is here that my patent comes in. It is more than a
ventilator; it is a roof cooler and it is a glass roof
cleaner.
Instead
of using the motive power to drive pulleys or bellows, I take the motive
power - water from the main - through a quarter inch gas pipe, with the
end drawn to a point and pierced with a fine needle; the water is
made to play direct on the fans at the top of the ventilator, and at the
same time producing a fine spray over the roof.
You
can take the pipe any direction you please over the house-top, and with
the stop-cock below you regulate the speed.
I
am sorry gentlemen that I cannot give you a practical
demonstration. It would have been a pleasure to have given you a
duplicate copy of the late royal review, and to have saturated you with
the elements; but respect for the table cover prevents me!
However,
by means of a foot-blower, I can demonstrate its action. As soon
as a slight current impinges on the exterior curved vanes the hood
revolves and distributes a fine spray in a circle about ten feet in
diameter, and at the same time sets in motion an interior archimedian
screw, which exhausts the air from the interior.
A
sketch of this device appeared beside the article published in BJP and
also beside the article published in Transactions of the Edinburgh
Photographic Society.
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