148 Earl Stanhope’s Remarks on Mr. Brydone’s 
In part XIX. of my Principles of EleCtricity *, I have enu- 
merated 44 eleven neceffary requiiites” in erecting conductors to 
i'ecure buildings againft damage by lightning. The ninth re- 
quifite is • f , 44 that there be neither large nor prominent bodies 
44 of metal, upon the top of the building propofed to bs 
44 fecured, but fuch as are connected with the conductor” (and 
confequently with the common flock) 44 by fome proper metal- 
44 lie communication.” And in feCtion 538, I ftate, that the 
44 confideration of the eleClrical returning ftroke fully evinces the 
44 utility of fuch precaution.” The circumftances mentioned 
by Mr. Brydone, that 44 fplinters had been thrown off in 
44 many places, particularly where the timber of the cart was 
44 connected by nails, or cramps of iron,” ftill more fully 
proves that fuch precaution is right. 
§ 32. The tenth J neceffary requifite in ereCting conductors, 
mentioned in my Principles of EleCtricity, is, “ that there be 
44 a fufficient number of rods.” And in feCtion 542 I ffate 
that, 4 * the higheft parts of a building, the mod elevated 
44 ridges, all the very prominent flacks of chimneys, and all 
44 the moft falient angles, ought, in order for the building to 
44 acquire the greateft degree of fecurity, to be armed with 
44 an high, tapering, and acutely pointed metallic conductor, 
44 properly connected with the common ffock. And upon edi- 
44 flees of great importance (efpecially magazines of gun- 
44 powder) the pointed conductors ought never to be above 
* See Principles of Electricity, from §519 to § 544, inclnfively; and parti- 
cularly fee § 5 1 9. 
•f See Principles of EleCtricity, § 519 and § 538. 
X See Principles of Electricity, § 519 j and from § 539 to § 542, inclu- 
£vely, 
“ forty 
