( W* ) 
fome other impediments intervened, ( after it was com to hand,) 
Fir (l on the Publifher’s, then on ^Engraver’s (ide > the follow- 
ing Particulars concerning the fame,, prom if ed fome Monet hs ago , 
had been imparted to the Pubiick a good while before this time . 
For the draught of the Figures, reprefenting the New Inftrument 
it f elf and the Defcription of the (ame y we are obliged to the in- 
genuity of Mr .. Hook. 
T He i. 2 and 3 Figures^ do reprefent the feveral parts of this 
Inftrument * the 4 th Figure 5 part of the T elefcope with the 
Inftrument applied to it, and the 5 th , the Ref ? on which the. 
whole repofeth. 
The 1 . Figure reprefents the Brafs-boxe with the whole In fir u- 
fmn% ( excepting onely the Moveable Cover.) and the S crews y 
by which it is fixt to the T elefcope. In this Figure (a a a a') is a 
final! oblong Brafs-box , ferving both to contain the Screws, and 
its Sockets or Femal Screws , and alfo to make all the feveral move- 
able parts of the Inftrument to move very true,fmooth, and in 
afimple-dire& motion. To one end hereof is fere wed on a Round 
pice of Brafs ( bbbb) about *3 inches overt the extream Limb 
of whofe outfide is divided into a iqo equal parts, and numbred 
by 10. 20. 30. &c. Through the middle of this Plate, and the 
•middle of the Box ( a aa ) is placed a very curioufty wrought 
of about the bignefs of a Goofe-quill, and of the length 
of t he Box , the head of which is by afixed Ring or Shoulder 5 on 
the Inride, and a fniall fpringing Plate, fdd ) on the Outfide, fo 
adapted to the Mate, that it is not in the leaft fubjed to fhake.The 
other end of this Screw is by another little Screw (whofe final! 
point fills th z Center or hole made in the end of the longer Screw 5 
for this purpofe) rendred fo fixt and fteady in the Boxe, that 
there appears not the leaft danger of fhaking, Upon the Head 
of this Screw without the Springing-Plate , is put onafinall Index 
f e e ) and above that a Handle ( mm ) to turn the Screw round, 
as often as there fhall be occafion, without at -all endangering the 
difplacingof the Index *, it being put on very ftiffupon a Cylin- 
drical part of th zHeaf and the Handle upon a Square. The 
Smw hd.th that 7 bird of it, which is next the Elatefoi^x than the- 
