2% Mr. Smea?on’s Obfervations on the 
get fuchalong ftrlp of brafs reduced to an equal breadth, than 
the method prefcribed by Hindley ; viz. by turning it upon 
the chock prepared; but I would not make it wider on one 
fide than the other, like the hoop of a caflc, as he deferibes, 
but exaftly to fit the chock, when truly cylindric ; for the 
internal elafticity of the brafs, in fo great a length, will be 
very fufficient for fitting it on tight enough, without any taper* 
ing. This I will now fuppofe done ; and a pair of fteel chaps , 
as deferibed by Hindley, to be alfo prepared, and ready for 
grinding; which, by fuch a careful admeafurement as can 
eafily be made, will give the length of the hoop fufficiently 
near, on its firft preparation. 
Method 'of forming a Pair of Straps as a check to the Divijiotu . 
The part firft cut off mu ft be again cut into two equal parts 
in length; which, for diftin&ion fake, I will call the Jlrapsi 
and which are to ferve as checks to every 6 oth and every 
1 20th divifion of the circle. 
A fteel plate, of about half an inch in breadth, the fame 
thicknefs as the ftraps 5 and in .length equal to the breadth of 
the hoop plate, muft be foldered with filver folder to one 
end of each of the ftraps, by which means their length 
will be increafed half an inch by the fteel. An hole muft then be 
made through each fteel plate, of the fame fize as thofe through 
the chaps, and anfwerable to the middle of the ftraps; but fo 
near the border of the fteel, that when the chaps are put on, 
and adapted to the fteel hole, the next hole will fall through 
the brafs. The fteel plates muft then be hardened ; and a pin 
being put through the two holes and the two plates, thefe muft 
