XXIV INTRODUCTION. 



Table 31 gives to hundredths of a grain the value of every tenth of a 

 gram from o.i to 9.9, and the value of every gram from 1 to 99. The values 

 of hundredths and thousandths of a gram are added as an aid to interpola- 

 tion. 



WIND TABLES. 



CONVERSION OF VELOCITIES. 

 Table 32. Synoptic conversion of velocities. 



This table, 1 contained on a single page, converts miles per hour into 

 meters per second, feet per second and kilometers per hour. The argument, 

 miles per hour, is given for every half unit from o to 78. Tabular values 

 are given to one decimal. For the rapid interconversion of velocities, when 

 extreme precision is not required, this table has proved of marked conven- 

 ience and utility. 



Table 33. Conversion of miles per hour into feet per second. 



The argument is given for every unit up to 149 and the tabular values 

 are given to one decimal . 



Table 34. Conversion of feet per second into miles per hour. 



The argument is given for every unit up to 199 and the tabular values 

 are given to one decimal. 



Table 35. Conversion of meters per second into miles per hour. 



The argument is given for every tenth of a meter per second up to 

 60 meters per second, and the tabular values are given to one decimal. 



Table 36. Conversion of miles per hour into meters per second. 



The argument is given for every unit up to 149, and the tabular values 

 are given to two decimals. 



Table 37. Conversion of meters per second into kilometers per hour. 



The argument is given for every tenth of a meter per second up to 60 

 meters per second, and the tabular values are given to one decimal. 



Table 38. Conversion of kilometers per hour into meters per second. 



The argument is given for every unit up to 200, and the tabular values 

 are given to two decimals. 



Table 39. Scale of Velocity equivalents of the so-called Beaufort scale of wind. 



The personal observation of the estimated force of the wind on an 

 arbitrary scale is a method that belongs to the simplest meteorological 



1 From Hand-Book of Meteorological Tables. By H. A. Hazen. Washington, 1888. 



