393 SCIENTIFIC RECORD FOR 1882. 



Arrangements are also made for obtaining the sum of tlie movements 

 of the table toward each of the four cardinal points. If the roller be 

 moved with a velocity proportional to that of the wind, whether directly 

 by a cup anemometer or by a mechanical translation of the trace as 

 given by such an instrument, while the table simultaneously assumes 

 orientations corresponding t^ the direction of movement of the air, the 

 line drawn by the style will be a miniature copy of the path of an im- 

 aginary particle animated by the movements actually belonging to the 

 masses of air which successively affect the anemometer at the given 

 station during the selected period, rigorously in accordance with the 

 principle known as Lambert's." {Nature, October, 1881, xxiv, p. 583.) 



H. S. Hele Shaw and Dr. Wilson have invented a new integrating 

 anemometer. An ordinary Eobinson's cup anemometer is used to drive 

 a train of wheels, and thus ultimately a serrated roller, which moves a 

 board in the direction of, and with a velocity proj)ortional to, that of the 

 wind. On the board, which is horizontal and about two feet square, is 

 placed a sheet of paper, upon which the roller i)resses, and in turning 

 leaves the required trace, at the same time moving the paper underneath 

 it. The board is prevented from having a rotary motion by means of a 

 pair of frames, the upper moving by means of wheels on the lower, each 

 of which can move only in one direction, and these directions are per- 

 pendicular to each other. By a clock-work adjustment the time element 

 is able to be introduced, which, taken in connection with space, gives 

 velocity. {Nature, September, 1881, xxiv, p. 167.) 



Messrs. Burton and Curtis have published the result of a series of 

 observations on the distribution of pressure over the surface of a flat 

 plate exposed perpendicularly to the action of the wind. They obtain 

 this distribution by inserting on the rear of this plate a number of small 

 Bitot's tubes, each of which gives the pressure for its own location. 

 They find, of course, the maximum pressure at the center diminishing 

 to scarcely one-half of that near the edge of the plate, the rates of dimi- 

 nution varying with the size and shape of the plate. {Nature, xxv, p. 

 427.) 

 . Ventosa describes an integrating anemometer invented by himself 

 very nearly identical with that proposed by Shaw and Wilson, and sim- 

 pler than that of Von Oettiugen. {Nature, xxv, p. 79.) 



Bourdon describes to the Paris Academy of Sciences a new form of 

 multiplying anemometer. Ilis system consists of convergent divergent 

 tubes. In one such tube, made according to Veuturi's proportions, is 

 fixed concentrically a second, much smaller, and having its divergent 

 end exactly at the point where the truncated summits of the cones of 

 the larger tube unite. (For very small velocities a third tube may be 

 similarly fixed within the second.) A hollow sleeve is fixed round the 

 union of the truncated cones of the wide tubes; its interior communi- 

 cates with that of the latter and with a manometer, on which the press- 

 ure is read. If a manometer at the mouth of the large tube register 1 



