3 60 Of Things relating to MaihematicJy&t. Part IV. 
A Box of ANATOMICK Inftrumcnts 5 fc. Saws, Steel 
and Ivory Knives, Chizgls, a Forceps, a Leaver, a Tenter, a 
Sirynge, Pipes, Probes, and Needles, 
S J5 C T. II. 
Of Things relating to the MATHEMATICKS j 
andfomeMECHANICKS. 
HTO Aftronomy. A REFLECTING TELESCOPE. Con- 
■* trived by Air. Ifaac Newton, Profeffor of the Mathe- 
matics at Cambridge. Whereby not only the cumber and 
charge of other Telescopes is avoided 3 one of thefe lefs than 
a foot long, magnifying as much as another of fix feet ; 
but the Object likewife, both by a more regular Refraction, 
and a lefs expence of Rays, is much more clearly repre- 
fented. 
It confifts of a Tube open towards the Object* and clofe 
at the other end. Where is placed a Metalline Concave^ 
inftead of an Objett-Glafs. Near the other end, a flat Spe- 
culum, alfo of Metal 3 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 Object, firft fall upon the Concave 3 
are thence reflected to the flat Speculum, thence to the Eye- 
Glafs, and through that deliver d to the Obfervers Eye. 
The Authors Defcription hereof at large 5 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 3 As alfo Mr. Hugeris de Zulichems Re- 
§ 82. m ' niarques on the fame 3 fee in the Phil. Tranfatlions. (a) 
Arithmetic^. An Inftrument for working Questions by 
Multiplying and Dividing. Contriv'd by Mr. Hook. Who 
purpofes to give the Defcription hereof himfelf. 
Geography. A WAY- WISER. Given by Bilhop Wilkins. 
Tis very manageable. It hath five Indexes pointing to fo 
many different Meafures,/f . Perches, Furlongs, Miles, Tens 
of Miles, and Hundreds of Miles 3 and turn d about with 
as many Wheels. Made to Work in a Coach, thus 5 In 
the 
