AflTcrdng, contrary to that Book, The Poles of the Earthy , 
and the Magneiick Poles to be the fame. 
The lift IS, of Tranfparence and Refraflion* Where he 
afferteth, That no Body, which was not Tranfparent from 
the Creation, can be raadefo by Humane Art. That Refra- 
flioa isdependent upon Hardnefs in Conjunftion wiih Gra- 
vity. And concludes with his Opinion of the Power of the 
Earth to produce living GreatUres. 
To thefe Dialogues , the Author fubjoy nsa fuppofed De- 
nionftration of a ftreighc Line , equal to the Arch of a 
Quadrant. 
III. Mechamk Exerdfes :Or, the DoSirweof Ha^df Works. 
Began ]du,i* proj'ecfitedw tmo ether ijff^//, February i,a;sd 
^larch f« ^Gji »And intendedtohe continued monthly^ By 
]Qkp^Uo^QV\, Bydrographer to the King, 
THE Authors lInderfaking,to fet down what is already 
known 5 bcing^good ; and not unlikely to give oc- 
cafion to others to confider of further Improvements in thefe 
Matters : it miy not be thought improper,tba£ the fame^oacer 
for all, be here reprefented. 
The Author , as he fairt in his Preface, having for many 
years been converfant in Handy -Works^efpecially Smithery^ 
Foui:Klteg^DrawingJoynery,Tur0in^^^ 
Books and Piflures^tpakingof Globes, Maps, Mathematical ■ 
Inftruments ; and being willing publickly to commanicate 
hisknovvlcdg herein 5 hath in his firfl: EfTay begun v^ith 
Snilthery , as comprehending with the Black-Smiths Trade 5 
all other handy-crafts , ufing either forge or file, from the 
Anchor-Smith to the Watch-maker : Which will be an Intro- 
duQiontomoft other handycrafts , as having a dependance 
upon this. And firfi, he gives Account of the fevcral Parts, , 
Rindsand Ufesof the Smiths Forge, Anvil, Tongues,Hammer 
andSledg,Vice,Hand-Vice,Pliars5Drill and Dril]-Bow,SkTew- 
Plate and its Taps . Then of Forging and the feveral Heats 
to be given : Of brazing and foldering. The feveral forts 
of Iron and their proper Ufes, And Iaftly,of Filing,and the 
feveral forts of Files. Im 
