^ 667 ] 
?• What the difference is between Iron and Wooden Ax« 
ell trees, and of the Grief and affridion madei^y them.with- 
in their boxes of their Naves. 
9. What is the true reafon of the difhing out of wheels. 
10. What is the true proportion of Timber which ought 
to be in the Nave, Spokes, or Rim of any wheele, ui order to 
lightnefs ftrength and uprightnefs . 
• II. What is the difference between the high and low 
hanging of Coaches thediftanceofthe Standards, and of the 
difference between the hinder and the fore-whecls. 
Other EXPERIMENTS. 
Take a Parallelipeppidon of wood, fuppofe 4 Inches fquare 
at the ends, and 8 Inches long with the weight thereof, and 
try as foUoweth 1^^^^. 
1. How much weight lefs then that of itfelf, applyed to. 
Convenient pullyes, will draw the faid Log over a fmooth le- 
vel Table, of an affigned length, in an aflign'd time, and 
what weight will draw the fame fafter or flower, in any af- 
figned proportion. 
2. What difference there will be in the Affridrion of the 
whole fide of the faid Log upon the plain Table, and mount- 
ing the fame upon 2 fmall Keels of a quarter of an Inclx 
.thick. 
I 3. What the difference between the lafE mentioned moun- 
ture, and letting the lame upon 4 thick Segments of Circles^, 
fo as to touch the 1 able but at 4 points, in imitation of drag- 
ging wheels, and whether it be material that the faid Seg« 
jlments fhould be of greater or lefler Circles 
Ij 4. What the difference between the faid mounture upon 4. 
iftich Segments, or upon 4 wheels moving diflinitly upon their 
Axell trees, as alfo between z wheels or one Segment like a 
Cart, or i wheeleand 2 fegments hke a wheele-barrow. 
5-. What the difference in draught will be in the afore* 
mention d draughts upon the various inclinations of the faid 
Table* upwards and downwards, or upon the faid Table co- 
vered with a blanket equally extended, or with apafte of 
Clay of a certain thicknefs. 
1 6' What the difference between the tendereft motion up- 
Ion wheels and the draught thorow water. 
Ch'ijiiani 
