366 On the Manufacture of Tin-plate. 
then turns it, and brushes the other side, and 
immediately dips it once more into the hot 
fluid metal in the wash-pot, and without let- 
ting it out of the tongs, instantly withdraws 
it again, and plunges it into the grease-pot 
(marked No. 3.) adjoining to the wash pot 
from whence he had just taken it. 
A person who has not seen the operation, 
can form but a very inadequate idea of the . 
adroitness with which this is performed— 
practice, however, gives the workman so much 
expedition, that he is enabled to make good 
. wages, although he obtains only three pence 
for the brushing and metallic-washing of 225 
plates. I am informed that an expert wash- 
man’, if he makes the best of his time, will 
wash 25 boxes, consisting of 5626 plates in 
twelve hours; notwithstanding every plate 
must be brushed on both sides, and dipped 
twice into the pot of melted tin. 
Why the plates should be dipped twice 
during this part of their manufacture, may, 
perhaps require some explanation. It must 
be recollected that they are brushed quite hot, 
and before the tin is set, therefore, if they had 
not the last dip, the marks of the brush would 
be visible. Moreover, the brush takes the 
greatest part of the tin off them, so that if 
they were removed to the grease-pot without, 
