APPENDIX. 351 
will be equal to 29. 72 fquare Inches : That 
I may therefore make fome Eftimate of the 
Degree of Coherence, of the Subftancc of 
the Bomb in this Ringlet, I (hall found my 
Calculation on Mr. Muskhenbroek*s LXXVIIth 
Experiment, in his IntroduBio ad Coharzn- 
Ham Corpormjy p. 50 where he found that 
Iron Wire, whofe Diameter was ~th of a 
Rynland Inch, was pulled afunder with four 
hundred and fifty Pounds weight. The 
Wire being made of hammered Iron, w^as 
probably tougher than the Bomb which is 
made of caft Iron ; I have therefore made a 
large Allowance for this, in leaving a great 
part of the Thicknefs of the Bomb out of 
this Eftimate. A Rynland Inch being to an 
Englijh Inch as o. 752 to i, then -^th of 
the Rynland Inch is o. 07^1, to which o. 153 
of an Englijh Inch being equal, it exprefles 
the fame Diameter of the Wire, the Area of 
whofc tranfverfe Seftion is therefore 0.0 13, 
by which Number, if the abovementioned 
Area of the Ringlet, vtz, 29. 72 be divided, 
the Produft is 228^, which multiplied by 
4jo, the Weight which was requifite to pull 
the Wire afunder, the Produft is 1028700 
Amjlerdam Pounds, which being • to com- 
mon 
