Brass . 
Ill 
posed to a considerable heat approaching to, but short of 
melting. The very thin coating of interposed borax, as- 
sists in preventing any oxydation of the surface of the cop- 
per, while it is too thin to prevent the adhesion of the me- 
tals. The double plate is then passed through well po- 
lished steel rollers, till it be of the required thinness : the 
silver and copper being diluted by the pressure, equally. 
An ounce of silver is often rolled out to a surface of a- 
bout three square feet and its thickness does not exceed 
the three thousandth part of an inch. Hence the silver is 
easily worn off the sharp edges of plated copper : an in- 
convenience remedied to a certain degree of late years, by 
using for the edges of plated ware, copper more thickly 
plated than in those parts of the utensil not so much ex- 
posed to friction. 
When plated candlesticks for instance, after long usc 3 
begin to shew the copper from the silver being worn off, 
it may easily and cheaply be renewed, by mixing the pre- 
cipitate of silver from nitric acid by means of common 
salt with two parts in quantity of whiting, two parts of 
common salt, and two parts of cream of Tartar. Those 
who are not chemists may make this paste thus. Send 
to the druggists for a quarter dollar’s worth of- Luna cor - 
nea, or Lunar caustic : moisten it in a teacup and mix it 
into a paste with twice and even thrice its bulk of each of 
the other ingredients above mentioned. When the can- 
dlesticks are cleaned, either with the linger or a soft cork 
rub the parts where the silver is worn off : the copper 
becomes almost instantly covered with a coating of pure 
silver, thin indeed, but which can be renewed at a small 
I expence. T. C. 
French plating, is managed by the application of silver 
leaf to copper or brass well cleaned and planished and 
then heated quickly, so as not to allow time for oxydation. 
The silver leaf laid on the heated metal, is then bur- 
