ADVERTISEMENT TO THIRD REVISED EDITION 



The original edition of Smithsonian Meteorological Tables was issued 

 in 1893, and revised editions were published in 1896 and 1897. A third 

 revised edition is here presented, which has been prepared at the request 

 of the late Professor Langley by the cooperation of Professors Alexander 

 McAdie, Charles F. Marvin, and Cleveland Abbe. 



All errata thus far detected have been corrected upon the plates, the 

 Marvin vapor tensions over ice have been introduced, Professor F. H. 

 Bigelow's System of Notation and Formulae has been added, the List of 

 Meteorological Stations has been revised, and the International Meteoro- 

 logical Symbols, together with the Beaufort Notation, are given at the 

 close of the volume. 



R. Rathbun, 



Acting Secretary. 

 Smithsonian Institution, 

 December, 1906. 



ADVERTISEMENT TO SECOND REVISED EDITION. 



The edition of the Smithsonian Meteorological Tables issued in 1893 

 having become exhausted, a careful examination of the work has been made, 

 at my request, by Mr. Alexander McAdie, of the United States Weather 

 Bureau, and a revised edition was published in 1896, with corrections 

 upon the plates and a few slight changes. The International Meteorologi- 

 cal Symbols and an Index were also added. 



The demand for the work has been so great that it becomes necessary 

 to print a new edition of the revised work, which is here presented with 

 corrections to date. 



S. P. Langley, 



Secretary. 

 Smithsonian Institution, 

 Washington City, 

 October 30, 1897. 



IV 



