Page:Philosophical Transactions - Volume 024.djvu/157

In the late Violent Storm or Hurricane of Wind, it was observable that the Mercury in the Barometer did not only considerably subside, but upon Extraordinary Gusts a Visible Vibration of the Quicksilver appear'd. And for satisfaction of the Curious, That High Winds are capable to lessen the Pressure of the Atmosphere, an Experiment has lately been Devis'd, and made at a meeting of the Royal Society at Gresham-Colledge, April the 12th, 1704. by Mr Fra. Hauksbee, giving a Demonstration of this Phenomenon. A Description of which take from the Delineation, Fig. 12. The Recipient .A. containing about 5 quarts, having about 3 or 4 times its Natural quantity of Air comprest in it by the Syphon, B. B. Which for that purpose is screw'd on at the Bottom within the side of the Bason C. The Stopcock .D. being turn'd, and the Syphon taken off, a small Swan-neck Pipe .E. is screw'd on in its place. The nose of which fits into a Brass Socket, which is fixt in a Cubical piece of Wood .F. right against the Horizontal pipe .G. From the same Cubical piece .F. arises a Naked Barometer .H. H. whose Cistern lyes open to the passage which leads from the Swan-neck Pipe to the Horizontal Tube aforesaid. Likewise from the same Piece .F. proceeds another Pipe or Tube parallel to the Horizon distinguish'd by .I. leading to another Cubical Piece of Wood .K. 3 foot distant from the former: Out of which likewise ariseth another Barometer .L. L. whose Cistern is also open to the Horizontal Tube .I. and by that means hath Communication with theopen