figure represent a section of the cylinder, andconceive it made up of concentricthin cylinders, such as PQ. Thetubes of flow will be everywhereperpendicular to this cylindricalshell, and we may assume its re-sistance the same as for a linearconductor, whose section is its area,and length its… … PROBLEMS IN VOLTAIC ELECTRICITY, 169 But since, Art. 31*, PQ . /, , PQ\ , OQ Resistance required Summing all successive differences, we have 2-rrcl where r^ is the external and r^ the internal radius of thecylinder. ^ This result is a particular example of the theorem of Art.178, and might have…
Electricity
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