168 Mr. Hatchete’s Experiments on the various Alloys , 
each other, the greatest loss is sustained by the soft gold. 
And, 
3dly. That pieces which have raised or embossed surfaces, 
suffer a greater loss, under every circumstance, than those which 
are smooth and flat. 
' The whole of the foregoing experiments were made with the 
machine called No. 1 ; and, as the friction was continued, in each 
experiment, during many days, with a pressure upon each couple 
of pieces equal to 3 lbs. 8 oz. 12 dts. and 21 grs., and as (consi- 
dering the severity of such a trial) the loss sustained by the 
pieces, separately or collectively, was not very considerable, it 
may with reason be inferred, that standard gold does not easily 
suffer abrasion by the friction of metal against metal, or of coin 
against coin, especially under the circumstances which com- 
monly prevail during the circulation of money. 
In the machine No. 1 , the pieces of gold were opposed face 
to face; it now therefore appeared proper, that the facts thus 
ascertained concerning the wear of gold, of different degrees 
of ductility, should be farther examined, and corroborated by 
a different method. To effect this, the second of the machines 
before described, which I shall call No. 2, was employed. 
It has been already observed, that this machine was a cubic 
box, of 8 inches withinside, formed of oak one inch in thick- 
ness, through which, a strong axis of iron passed, so as to be 
turned by a wheel and pinion. 
Experiment with the Machine No. 2. 
Two hundred pieces of gold, of five different qualities, were 
employed in this experiment; and it must be previously remarked, 
