METEOROLOGY. 293 



133. [The dependence of the psyclirometer constant upon the veloc- 

 ity of the wind, and the eflect of barometric pressure, especially at such 

 high altitudes as Pike's Peak, are matters that are now being inves- 

 tigated by the Signal Office, and it is to be hoped that formulse and 

 tables which may be approved by the International Congress of meteor- 

 ologists will soon be available. But still more desirable is it that some 

 improved dew-point, chemical or other method may be invented prac- 

 ticable for daily use by all observers, and calculated to replace the 

 psyclirometer.] 



134. 11. Fuess, of Berlin, describes the Assmann anemograph and 

 the Sprung-Fuess anemograph, both as made by himself in a high style 

 of etegauce and perfection. The latter apparatus cost 1,100 marks, and 

 is more complicated than that of the former, whose ])rice is 630 marks, 

 but the yprung-Fuess overcomes several difliculties, and is probably 

 more desirable. Both are in working order at several stations. (Z>. M. 

 Z., p. 350.) 



135. I*rofessor Bornstein, of Berlin, has constructed a pressure ane- 

 mometer, consisting essentially of a ball 126""" in diameter at the top 

 of a heavy vertical rod, which at some distance below is supported by 

 a gimbal or universal joint ; from the lower end of the rod hangs a wire 

 by means of which record is made of the deflection of the rod from the 

 vertical. {Nature, xxix, p. 280.) 



136. Dr. Maurer, of Zurich, has established at the station on the very 

 summit of the Siintis a self-recording anemometer specially made by 

 Munro, of London, for this station. He gives a description of the ap- 

 paratus and the lightning protection which may be of value to those 

 establishing mountain stations elsewhere. With reference to self- 

 recording thermometers he states that the exi)eriraents of Prof A. 

 Fischer showed uniformly that metallic spirals, &c., always lag behind 

 the tine temperature of the laud. The same result has been deduced 

 by llaun in comparing a Hottinger metal thermograph with a Theorell 

 self registering mercurial. Maurer has therefore introduced the so- 

 called upset thermometer invented by Negretti and Zambra. {Z. 0. 

 G. i¥., xviii, p. 411.) 



137. [The comparison between the normal or standard barometers 

 used in the various national observatories and weather services has 

 progressed but slowly through the past year. Owing to the sickness of 

 Professor Waldo the extensive and important work uiulertaken by him 

 at St. Petersburg, Berlin, Hamburg, Paris, London, and Washington 

 has not as yet been discussed and made available.] 



138. Denza has published the results of the barometric conijiarisons 

 made by Tacchini and Chistoni, from which we quote the following: 



The normal barometers at St. Petersburg, Paris (College de France), 

 Kew, and Moncalieri agree with each other to within 0.05™'". The 

 barometers at Greenwich, Geneva, Stockholm, Vienna, and Algiers are 

 less than 0,05"'"' higher than the !St, Petersburg normaj. The baromg)- 



