254 On the Transverse Strain, 
into a groove formed in the end of the other : 
With these two ends brought into close con- 
tact, the irons were firmly nailed to one side 
of the piece of wood intended to be operated 
upon, the junction of the irons being at its 
middle. The piece of wood, having that 
side with the iron on it uppermost, was then 
laid horizontal, with its ends resting on two 
props, and weights were hung at its middle, 
while the point of a needle which was fixt to 
the wood indicated on an ivory scale, the 
quantities of its depressions. 
