12 On the Mechanical Properties of Iron and Steel. [Jan., 
To ascertain the comparative values of steel when subjected to 
transverse, compressive, and tensile strains, the following abstracts of 
results have been taken from “ Fairbairn’s Experimental Researches ” 
on the mechanical properties of Steel im its present improved state 
of manufacture. 
Abstract of Summary of Results from the E.cperiments on Transverse 
Strain. 
Deon waine, D, Bosmeet Were a2 yas of os 
: . t ti lasticity, E, tion, U,| it 
_ MANUFACTURER. for ae of Pres, Goeeaponains to torah of Working 
sure and Section,/112 lbs. Pressure.| Section. Strength. 
werd. Tons, 
Messrs. Brawn & Co........-| *0012739 31,551,000 52-721 5918 
»  Cammell & Co.......| °0013518 30,650,000 | ‘35-9897 5°921 
» Naylor & Vickers....| °0013007 29,481,000 65-049 67548 
» 8. Osborn & Co. .....| 0014296 27,540,000 52°574 5°622 
» Bessemer & Co.......| *0016584 28,673,000 49-489 9°659 
» Sanderson Brothers ..| *0013229 29,355,000 47411 5°521 
Se, eLurton/ a SOnS) sey. °0013120 30,750,000 52°680 5°886 
The Titanic Steel Co. ...... “001235 33,088,000 63°542 6435 
Mean. 0013615 | 30,141,000 | 55-420 5939 
In this short abstract we are unable to give the experiments in 
full or the General Summary of Results, our limited space admitting 
only the mean value of each sample of bars as received from the 
different works. These bars were of different qualities, and were 
tested separately in order to determine their tenacity, elasticity, 
ductility, &c., and the details of each are given separately in the 
general table of Results. From these tables we have merely taken 
the mean of the resistances to strain and the working values of the. 
bars as determined from the experiments and the samples, taken 
collectively, from each marker. In the general report, the strength 
and other properties of the different specimens are given separately, 
and for these details we must refer the reader to the ‘ Transactions 
of the British Association’ for 1867. 
It will be observed that the above and the followimg tables of 
Results are taken from the General Summary, where the deflections, 
elongations, and compressions are carefully recorded; and from 
these are deduced the different powers of resistance and working 
value, as exhibited in the columns of each table. The difference in 
this case is, that the mean results are taken from the whole number 
of specimens received from each maker, and not from the separate 
bars experimented upon, as given in the Tables. 
The first column gives the names of the makers, or the works 
from which the steel was obtained; the remaining columns give 
respectively the deflections for unity of pressure and section, the 
modulus of elasticity corresponding to 112 lbs. pressure, the work 
