RESISTANCE. 



lefs refinance than the fiat or plane ends of the fame dia- 

 meter ; but the (harper end has not always the leafl refin- 

 ance. Thus, the cylinder, and the flat ends of the hemi- 

 fphere, and cone, hare more refinance than the round or 

 marp ends of the fame, but the round fide of the hemi- 

 fphere has lefsreliftance than the (harp end of the cone. 



4. The refinance on the bafeof the hemifphere is to that 

 of its convex part, as 24 to 1, infteadof 2 to I, as given by 

 theory. The experimented refinances alfo exceed the 

 theoretical by nearly £th. 



5. The reflttance on the bafe of the cone is to that on its 

 vertex, nearly as 2™ to I, which is the fame as the ratio of 

 the fine of tile angle of inclination of the fide of the cone 

 to its axis ; fo that, in this inflance, the refillance is as the 

 fine of the angle of incidence. 



6. When the hinder parts of different bodies are of dif- 

 ferent forms, the refiltances are different, although the fore 

 parts be exaftly the fame ; owing probably to the different 

 prefTures of the air on the hinder parts. 



Thus the refiftance to the fore-part of the cylinder is lefs 

 than on the equal flat furtace of the cone, or of the hemi- 

 fphere ; and the refinance on the bafe of the hemifphere 

 lefs than that of the cone ; and the round fide of the hemi- 

 fphere lefs than the whole fphere. 



Table II. Refinance, both by Experiment and Theory, 

 to a Globe of 1.965 Diameter. 



In the firlt column of this table are contained the fever il 

 velocities, gradually, from 5 feet per fecond to the greatert 

 velocity of 2000 feet per fecond, with which a globe or 

 ball is moved. In the fecond column are the experimented 



refinances in avoirdupois ounces. In the third, the cor. 

 refpondmg refiltances as deduced from theory. In the 

 fourth column the ratio of thefe two refinances, or the 

 quotients of the former divided by the latter ; and the fifth 

 or lalt, the indices of the power of the velocity which is' 

 proportional to the experimented refinances, and which are 

 found by comparing the refinance of 20 feet velocity with 

 each of the following ones. 



The following tables are of a fimilar kind, but the expe. 

 riments are repeated on balls of different fizes. 



Table III — Refinances to a ball of 1.965 inch diame- 

 ter, and 16 oz. 13 dr. weight. 



lftDif. 



Table IV Refin- 

 ances to a ball 2.78 inc. 

 diameter, and 31b. weight. 



8^ 



«r 



20 



27 

 35 

 44 

 54 

 66 



79 



92 



104 



"5 

 124 



l 3 l 

 *35 

 '35 

 133 

 128 

 122 



2d Dif. 



6 



7 

 8 



9 

 10 

 12 

 '3 



'3 

 12 



11 

 9 



7 



4 



o 



— 2 



-5 

 -6 



_ 



Table V.— Refift. 

 ances to a ball 3.55 inc. 

 diameter, and 61b. 1 oz. 



8dr. weight. 



The 



