Mounting Tinfoil on Glass Condenser Plates
A GOOD shellac for fastening the foil to the glass in transmitting condensers may be made by dissolving as much powdered rosin as possible in I oz. of turpentine and thinning the mixture by the addition of ½ oz. of alcohol. Only a very small amount of rosin will be needed.
About three drops of shellac should be put in the center of the surface of the glass and rubbed around well. Place the foil on the glass and roll it fast with a photographic print roller. The foil must be placed on at once as the mixture dries quickly. When this varnish is used the plates may either be stacked or made into an open rack condenser. If plain turpentine is used the foil will not stick so well and consequently the plates must always be STACKED.-SAMUEL W. HUFF.