OTHER PROPERTIES OF CAST IRON. 185 
The following being a practical enquiry, it is 
not necessary to step out of the way inzsearch 
of general principles: the effort will therefore 
be confined simply to investigating the peculiar 
merits of the different irons of British manufac- 
ture; exhibiting their most remarkable features, 
and rendering their applicability matter of cer- 
tainty as respects strength, fluidity, power of 
being worked, &c. The enquiry will, therefore, 
in a great measure be devoted to those objects ; 
shewing the strength and deflection of each iron 
under a transverse strain in the first instance, 
and subsequently interspersed with observations 
arising from microscopic examination, and the 
turning and filing process to which they were 
severally subjected. 
In the annexed tables I have given an abridged 
form of the experiments, and selected such 
weights, deflections, and numbers, as will give 
a succinct and clear illustration of the methods 
adopted in the experiments.—To each class of 
experiments, and to each iron, is attached a ta- 
bular form of results, with the values reduced 
to those of bars exactly one inch square; the 
reductions being made by supposing, as is gene- 
rally admitted, that the strength of rectangular 
