WITH NOTES. 529 



\_A way for Sea-banks. ] This article stands alone in 

 the &quot; Century&quot; as an example of a singular divergence 

 from its author s main course of pursuits. It is more 

 than likely that his idea in the present instance was the 

 mere use of loose stones, laid down at such a curvature 

 as to break rather than resist the force of heavy seas and 

 rapid torrents, for such a plan would be decidedly 

 &quot; cheaper and stronger&quot; than any masonry, especially if 

 presenting a vertical surface to the surging sea. 



97- 



An Inftrument whereby an igno 

 rant perfon may take any thing 

 in Perfpective, as justly, and more 5 

 then the Ikilfulleft 6 Painter can do 

 by his eye. 



5 more so. P. 6 most skilful. P. 



[A perspective Instrument. ] John Bate, in his &quot; Mys 

 teries of Nature and Art,&quot; 1635, gives, at page 155, 

 &quot; A very easie way to describe a Towne, or Castle : 

 being within the full sight thereof.&quot; A vertical square 

 frame is divided by means of a number of threads, 

 crossing each other at equal distances. A vertical 

 pillar opposite, has a spy-hole at the top, through 

 which the town, or other prospect is to be viewed, and 

 to be drawn square by square, on paper placed on the 

 table below, until the whole is completed, as shown 

 in a wood-engraved illustration. No doubt the Marquis 

 had refined on this, or some like invention. 



98. 



An Engine fo contrived, that 

 working the Pnmum mobile forward 

 or backward, upward or downward/ 



7 forwards or backwards, upwards or downwards. 



2 M 



