Below are given instructions on burnishing photographs with a bar burnisher. First examine the bar to see that it is free from scratches. Unscrew the nut and remove the slab holding the plated bar. If the bar shows any scratches running across it, rub from end to end with a piece of fine emery cloth glued flat to a bar oi wood till the scratches disappear. Dust carefully all the parts and replace the slab. Now light the stove beneath the slab. Moisture on the slab must be wiped away till it ceases to appear. A lubricator should be made up by dissolving about 20 gr. of castile soap in 2oz. of methylated spirit. The lubricator is rubbed over the iace of the print and allowed to dry spontaneously. Some workers prefer to rub the soap over dry with a silk handkerchief. Wet the tip of the finger and just touch the end of the bar. If it hisses it is warm enough A trial print is now passed through the burnisher, and it it is neither scratched nor scorched, but shows a good polish, the rest of the prints may be burnished. The print must be passed through at one sweep; a stoppage means a line or dent across the print. In passing the print through the burnisher, lift the near part above the opening; this will cause the print to curl slightly outwards, but as it curls it will lie fiat.

Prints should go through the burnisher lengthwise. The great disadvantage in using a bar burnisher is its tendency to scratch, although this trouble is minimised by careful use. For this reason " enamellers," such as the " Quadruples -hnameller, are generally used. In these machines the print passes between two plated rollers heated from below. A " lubricator " is not needed, and scratches are impossible.