A Catalogue of Instruments.

the meanest find something within his Reach,the Theory of it displays an ample Field,and the Practice of it has always been pro-ductive of many great Advantages to Menof Action and Business.

As Mathematical Instruments are theMeans by which the Sciences of Geo-metry, Astronomy, Philosophy, and Opticks,have been rendered useful in all the com-mon and necessary Occurrencies of humanLife, they not only enable us to connectTheory with Practice, but also instruct ushow to turn bare Contemplation into themost substantial Use, by making one of themost serviceable Branches of Learning thenatural Way of rendering this Knowledgegeneral and diffusive.

Mathematical Instruments.

i.

C ASES of Drawing Instruments,the Scales and Sector eitherWood, Ivory, or Brasi, from ios.

6 d. to --- —-5

Magazine Cafes of Instruments, from

7 /. 7 s. to-26

Silver Cafes of Instruments, from

2 /. 12 s. 6 d. to---21

Proportionable Compasses-1

Ditto - 3

5

0

0

0

0

0

11

6

3

0

Sectors