26 Mr. Smeaton’s Ohfervatlons on the 
the other, that It may fit the better to the block, which will be 
a fiiort piece of a cone of a large diameter : when the hoop was 
turned, I took it off, cut, and opened it ftraight again. 
The next ftep was to have a piece of fteel 
bended into the form as per margin * ; which had 
two fmall holes bored in it, of equal bigriefs, one 
to receive a fmall pin, and the other a drill of 
equal fize. I ground the holes after they were 
hardened, to make them round and fmooth. The 
chaps formed by this fteel plate were as near to- 
gether as juft to let the long plate through. Be- 
ing open at one end, the chaps fo formed would 
fpring a little, and would prefs the long plate 
clofe, by fetting in the vife. Then I put the long 
plate to a right angle to the length of the fteel chaps, and bored 
one hole through the long plate, into which I put the fmaU 
pin; then bored through the other hole; and T>y movirigx the 
fteel chaps a hole forward, and putting iiy the pin in the lafl: 
hole, i proceeded till I had divided the whole length of the 
plate. 
The next thing was to make this into a circle again. After the 
plate was cut off at the end of the intended number, I then 
proceeded to join the ends, which I did thus: I bored two nar- 
row fhort brafs plates + as I did the long one, and put one on 
theinfide, and the other on the outfide of the hoop, whofe ends 
were brought together ; and put two or three turned fcrew 
pins, with flat heads and nuts to them, into each end, which 
held them together till I rivetted two little plates, one on each 
fide of the narrow plate, on the outfide of the hoop. Then I 
took out the fcrews, and turned my block down, till the hoop 
*■ The figure is confiderably lefs than the real tool fhould be. 
t Thefe I (hall hereafter diftinguiih by the name of / addle-plates . 
4 would 
