4 
A Catalogue of 
3 Drawing pens, either with or without a pro- 
trailing pin. 
4 Sectors, for finding proportions between quan¬ 
tities of the fame kind, as between lines and 
lines, furfaces and furfaces, &c. either of 
box, ivory, brafs, filver, &c. 
5 Plain fcales, or. 
6 Square protractors, or, 
7 Parallel Rules, are 
8 Semicircle protractors, of brafs. 
In the belt cafes, the compafies are always 
made with fteel joints, and the knibs of all 
the pens are made to open with a joint, in 
order to clean them, in which are alfo fome- 
times put, 
9 Hair compafies, fo contrived on the infide of 
one of the legs, that an extent may be taken 
to an hair’s breadth. 
iq Circular (or bow) compafies, with which a 
circle as fmall as a pin’s head may be defcri- 
bed. 
In a magazine cafe of drawing inftruments, 
is generally contain’d all the above infiru- 
ments, together with the following particu- 
culars, 
11 Drawing compafies, with moveable legs lon¬ 
ger than thole of No. 2. 
12 Strong compafies, with calliper and cutting 
points. 
13 Beam compafies, for drawing larger circles, 
and taking larger extents. 
14 Proportionable compafies, for the ready dimi- 
nififing plans or drawings, in any afiigned 
proportion. 
15 12 Inch Brafs Sectors, of a new conftruCtion, 
16 Triangular compafies, for transferring three 
points 
