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
had a few years ago a paper and pretty lively discussion on ventilators
 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.
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
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.
can take the pipe any direction you please over the house-top, and with
the stop-cock below you regulate the speed.
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!
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.
sketch of this device appeared beside the article published in BJP and
also beside the article published in Transactions of the Edinburgh