284

THEORY AND PRACTICE

TRACT 37.

enabled to compare the strength of different kinds of matterwith each other, which different bodies consist of. To illus-trate these inferences, the following practical examples arehere annexed.

147. Exam. 1. Taking here again the same example asat art. 138, to compute it by this rule,

-xr- = —~t— = -r-r- lor the value ol j ; and for the values the space penetrated. Now, in this example we have givend = 1*96 = 2 nearly, v = 1600, and 5 = 20; therefore

5rfu’ 5.2.1600’ 200’ _. . r , , ,

'647 ~ cj - 20 ~ ~T ~~ 200 ®° = f ^ ,e value of the elm s

resistance by this rule, in the first case.

148. Exam. 2. In like manner, for the 2nd example, in

art. 139, where d — 2, v = 1200, s = 15, the rule gives

5.2.1200’ 2.150’ 45030 _ . , , „ .

• ' 64 15 ■ =■ —g— = —— — 15000 the value off in this

case.

149. Exam. 3. Again, for the 3rd example in art. 140,when d = 2*78 or 2*8 nearly, and v =z 1500, also, s = 30;

give — — — 0 -= ■ - a 3 = 16406 the value of f in this

case.

150. Exam. 4. Lastly, for the 4th example, in art. 141,where again d = 2-8, also v = 1060, and s = 16; which5 . 28 . 1060’ 14.265’ 7.265’

S lv ’e*—gj—— = — g — = —= 15362 the value of/inthis case.

151. Then to take the medium among these four,

200001500016406l. l 53624 ) 66768

the medium value 16692 of /, by this rule, beingnearly the same as before, viz, 17315, by the first rule.

152. Exam. 5. To find bow far a 24-pound ball of cast