112 ANNUAL RECORD OF SCIENCE AND INDUSTRY. 



plicable to many cases where more troublesome apparatus 

 would be out of place. His arrangement consists essentially 

 in such an alteration of the well-known printing barometer 

 constructed by G. W. Hough, of Albany, that the use of elec- 

 tricity is done away with, and, on the other hand, the ful- 

 crum of the principal lever in the apparatus is fixed, while 

 the barometer tube itself, or the aneroid box, moves. The 

 numerous specimens of the apparatus constructed by Redier 

 for individuals in France seem to have given very general 

 satisfaction, and the instrument has been highly commended 

 to the attention of French observers. It consists essen- 

 tially of a clockwork by means of which a cylinder is made 

 to revolve uniformly, carrying with it a sheet of paper upon 

 which the record is to be made. Above the cylinder stands 

 the barometer, which is so arranged that the rise and fall of 

 a thousandth part of an inch causes a lever to rise or fall 

 by a corresponding movement, thereby releasing the detent 

 of an auxiliary piece of clockwork, which is thereby at once 

 set in motion. The movement of this clockwork, allows the 

 barometer tube itself to fall or rise, thereby again interfer- 

 ing with the movement of the clockwork and automatically 

 stopping it. Meanwhile the up or down movement of the 

 barometer has been closely followed by the corresponding 

 movements of a pencil, whose mark on the sheet of paper 

 produces an exact record of the extent of the barometric 

 change. 13 B, III., 267. 



DO STORMS CROSS THE ATLANTIC ? 



Mr. Ley states that, having worked for a considerable time 

 at the comparisons of United States with European weather 

 charts, he concludes that only a small portion of the storms 

 experienced on the American side of the Atlantic can subse- 

 quently be distinctly traced in Europe. Of those thus trace- 

 able the majority are felt severely in the extreme north of 

 Europe. The rapidity of the progress of these storms across 

 the Atlantic varies indefinitely, and could not be deduced, 

 as* Mr. Draper lias attempted, from the velocity of the winds 

 experienced in them. Many of the most destructive Euro- 

 pean storms occur when the barometric pressure over the 

 eastern portion of the United States is tolerably high and 

 steady, and they appear to be developed upon the Atlantic 



