560 Of Things relating to Mathematical,&c. Part IV. 
A Box of ANATOMICK Inftruments ; fc. Sam, Steel 
and Ivory Knives, Chizels, a Forceps, a Leaver, a Tenter , a 
Sirynge, Pipes, Probes, and Needles. 
Sect. II. 
Of Things relating to the MATHEMATICKS j 
and fame MECHANICKS. 
TO Afironomy. A REFLECTING TELESCOPE. Con- 
trived by Mr. Ifaac Newton, Profeffor of the Mathe- 
maticks at Cambridge. Whereby not only the cumber and 
charge of other Telescopes is avoided 5 one of thefe lefs than 
a foot long, magnifying as much as another of fix feet : 
but the Objedt likewife, both by a more regular Refradtion, 
and a lefs expence of Rays, is much more clearly repre- 
fented. 
It confifts of a Tube open towards the Objedt, and clofe 
at the other end. Where is placed a Metallbie Concave , 
inftead of an Objeci-Glafs. Near the other end, a flat Spe¬ 
culum, alfo of Metal 5 placed obliquely towards a fmall 
Eye-Glafs 5 fc. upon that point of the Tubes Axis, on which 
the perpendicular falls from the faid Eye-Glafs. So that the 
Rays coming from the Objedf, firft fall upon the Concave 5 
are thence refledted to the flat Speculum, thence to the Eye- 
Glafs, and through that deliver'd to the Obfervers Eye. 
The Authors Defcription hereof at large 3 together with a 
Difcourfe of the Materials which are or may be thought 
fitteft for the Speculums 5 a Table of Apertures and Charges 
for feveral lengths ; As alfo Mr. Hugens de Zulichems Re¬ 
marques on the fame; fee in the Phil. Tranfaftions. (a) 
Arithmetic 4 An Inftrumcnt for working Queftions by 
Multiplying and Dividing. Contriv'd by Mr. Hook, Who 
purpofes to give the Defcription hereof himfelf. 
Geography. A WAY-WISER. Given by Wilkins. 
Tis very manageable. It hath five Indexes pointing to fb 
many different Meafures,/c. Perches, Furlongs, Miles, Tens 
of Miles, and Flundreds of Miles; and turn'd about with 
as many Wheels. Made to Work in a Coach, thus 5 In 
the 
