"The intention of this contrivance is that the winds and eddies which strike against the oblique surface of these covers may be reflected upwards instead of blowing down the Chimney.—The invention is by no means new, but it has not hitherto been often put in practice.—As often as I have seen it tried it has been found to be of use; I cannot say,. however, that I was ever obliged to have recourse to it, or to any similar contrivance; and if I forbear to enlarge upon the subject of these inventions, it is because I am persuaded that when Chimnies are properly constructed in the neighbourhood of the Fire-place little more will be necessary to be done at the top of the Chimney than to leave it open."