PHYSICS OF THE GLOBE. I53 



to the deflection of currents of air by the sides of the build- 

 ing, which deflections vary with the direction of the wind. 



A new self-registering anemometer has been described by 

 Herve Mangon (Nature, p. 316). He combines the Robinson 

 cups and the windmill-vanes very much as in the instruments 

 made by Beck for the London Meteorological Ofhce ; but his 

 registering apparatus acts through the intervention of elec- 

 tricity, as iu the apparatus devised by Gibbon for the Army 

 Signal-Office. The record is made upon a long fillet of paper. 



Dr. T. R. Robinson communicated to the Royal Society of 

 London, in April, the results of new experimental investiga- 

 tions upon the constants of the cup-anemometer. He repeat- 

 ed, with some modifications, the experiments made by Dohr- 

 andt. His anemometers had cups of 9, 4, 9, and 4 inches di- 

 ameter, and arms of 24, 24, 12, and 12 inches in length re- 

 spectively; but hemi-cylindrical cups 9 inches square, with 

 24-inch arms, gave decidedly the best results. 



Hipp's self-recording anemometer, which is being widely 

 adopted in Switzerland, is described by him in the Bulletin 

 of the Society of Neuchatel, vol. x. The Robinson cups re- 

 cord their revolutions by means of electricity, so as to give 

 the velocity by minutes or by hours, as may be desired. In 

 the same volume, Professor Schneebeli continues his annual 

 reports of the Variations in Level of the Swiss Lakes. 



A contribution to anemometry is to be found in a short 

 memoir, by G. A. Hagemann, in the Introduction to the Me- 

 teorological Annals for 1876, in the Danish Meteorological 

 Institute. Hagemann compares the siphon-anemometer 

 known as the Lind anemometer in England and America 

 with a modification of it by Captain Magius. His conclu- 

 sions are in favor of the siphon or Pitot tube, and not in fa- 

 vor of Magius's invention. 



The ninth volume of the Transactions of the New Zealand 

 Institute contains, among other articles on meteorology, one 

 by Captain Marten on Anemometry. He considers that the 

 extraordinary wind velocities recorded by the Robinson ane- 

 mometer, such as 153 miles per hour at Sydney, New South 

 Wales, 109 at Southland, New Zealand (and 181 at Mount 

 Washington), are not real, but need a large correction for in- 

 strumental peculiarities, such that, as he concludes, the ve- 

 locity of 153 miles corresponds to one of scarcely 100. 



G2 



