GENEEAL OBSEEYATIONS ON THE WINDS. 



105 



TABLE, 



Showing the Force and Velocity of the Wind from Light Airs to Heavy 



Gales and Tempests. 



Pressure 



in lbs. on 



Square 



Foot. 



Velocity. 



Feet per 

 Second. 



Miles per 

 Hour. 



Popular Descriptions. 



0002 

 0004 

 0019 

 0032 

 0043 

 0065 

 0-071 

 0090 

 0-100 

 0-112 

 0-130 

 0-162 

 0-228 

 0-260 

 0-291 

 0-364 

 0-390 

 0-452 

 0-521 

 0-551 

 0-650 

 0-780 

 0-830 

 0-884 

 0-910 

 1-042 

 1-170 

 1-250 

 1-302 

 1-470 

 1-563 

 1-630 

 1-790 

 2-084 

 2-600 

 3-126 

 8-647 

 4-168 

 4-689 

 5-200 

 7-800 

 10-400 

 18-000 

 20-800 

 26-000 

 31-200 

 41-600 

 52-000 

 62-400 



1 



1-47 



3 



3-9 



4-5 



5-28 



5-87 



6-6 



6-98 



7-34 



7-89 



8-8 



10-4 



11 



11-8 



13-2 



13-6 



14-7 



15-8 



lG-2 



17-66 



19-3 



20 



20-6 



20-9 



22 



23-6 



24-2 



25 



26-5 



27-39 



28 



29-35 



3115 



35-32 



88-73 



41-83 



44-83 



47-44 



50 



61-18 



70-72 



79-07 



100 



111-74 



122-62 



141-30 



157-98 



173-06 



-5 



-75 



0-68 

 1 

 2 



2-66 

 3 



3-8 

 4 

 4- 

 4- 

 5 



5-38 

 6 

 7 



7-6 

 8 

 9 



9-27 

 10 



10-77 

 11 

 12 

 13 

 13-6 

 14 



14-25 

 15 

 16 

 16-5 

 17 

 18 



18-67 

 19 

 20 



21-47 

 24 



26-40 

 28-52 

 30-56 

 32-34 

 34 

 41 

 48-2 

 53-91 

 68-18 

 76-18 

 83-6 

 90-34 

 107-7 

 120 



■^ Gentle airs (unappreciable by gauge). 

 _) [Beaufort Scale, 1). 

 \ Light airs (just appreciable by gauge) ; 

 > -would fill the lightest sail of a yacht. 

 ) [Beaufort Scale, 2). 



Light breezes, such as -would fill the 

 lightest sails of a large ship (3). 



INIoderate breezes, in which ships can 

 carry all bail (4). 



Fresh breezes ; topgallant sails and 

 royals (5). 



? Fresh -winds ; reefs (6). 

 Strong -winds ; treble-reefed topsails (7). 



") Gales ; close-reefed topsaUs and reefed 



1 



courses (8). 



I Strong gales ; close-reefed topsails and 



j stay-sails (9). 



J 



Hea-vy gales and storms (10). 



N. A. 0, 



1 



I Very hea\'y gales ; great storms ; tem- 

 ( pests (11). 



Tornados; cyclones; hurricanes (12). 



15 



