Obfervations on E!s&ncii^>, ^C, 



as well as the other kind. If gentlemen would make this ad- l 



dition, when they ere6: any new rod j the efFeifl would fbon^ 

 be known, and it is my opinion that a rod might be denticu- 

 lated in the manner propofed, at lefs expenfe than fquare bars 

 could be reduced into a cylindrical form, - : - 



" A rod, upon thefe principles, may be prepared in the fol-r 

 lowing manner. Take a number of fquare bars of iron, as 

 they conie to our market, of about an inch in thicknefs, and. 

 connect them together by a fcarfed, or a halved joint at the- 

 ends, and fecured with a fcrew. When a fufficient number 

 of bars are thus conne(fted to make the height intended (which 



ihould always be as liigli as th-e rod cati pofllbly be fuftained) 



then take them afunder, at the joints, and place each fingle 

 bar in fuccefhori, on a blackfmith's vice, "with the jaws about 

 half an inch apart, for one angle of the bar to reft between, 

 without bruifiiig, while the workman proceeds, with a cold 

 chiiTel, well prepared, to raife a barb, at the dlftance of every 

 inch, or half inch, along the upper corner or angle of the bar, 

 as it lays in the vice, and when that corner is done, bring up 

 another angle, in the fame portion, and To prbceed,^ until the 



^ T r ', 



J 



whole arc finillied. • -^ 



i U t « 





M^ 



Rods upon this conflrucllon may terminate with three 

 points ; but I iliould prefer a light liar, or glory, at the top of 



r ^ 



the rod, and the lower end funk pretty deep into the earth. 



perliaps to the level of the Iprings of water, and the hole fill 



up with charcoal about the rod 



2 



Perhap 



