elv Proceedings of the Asiatic Soc of Bengal. |N.S., XVI, 
follow of the direction and velocity of the wind at any required 
level; and for purposes of preparing normal values of these 
elements, the flights are tabulated at regular half-kilometre in- 
tervals from the ground upwards, and are thereafter combined 
by mechanical means into resultant values for each level over 
half-monthly periods throughout the year. 
ear and cloudless weather we are able in India to 
follow a three-foot balloon to distances as great as 65 km. 
(40 miles), corresponding sometimes with vertical heights of 
15 or 16 km., before it is lost to sight and measurements cease. 
25. But a matter of more interest perhaps lies in the 
methods of recording by instruments the conditions of tem- 
a form brought to high efficiency by Mr. Dines in England. 
The largest illustrated here was 15 feet high, while that most 
commonly used measured 9 feet, and weighed 13 Ib. only. 
This smaller kite was capable of carrying out several miles 
of steel piano-wire from a winding machine and of rising in 
a strong steady wind to a height of well over a mile: several 
such kites could be attached in tandem, at intervals of a 
mile or so, to one tetherwire, with the recording instrument 
miles, 
co The use of kites like these is a matter of serious manipula- 
tion, and involves an engine to wind in the steel tether-wire ; 
