The following formula should be applied to the mahogany of the camera by means of a soft rag, rubbing it well in, finally polishing lightly with a clean soft cloth:

Raw linseed oil...... 6 ounces

White wine vinegar... 3 ounces

Methylated spirit.... 3 ounces

Butter of antimony... 0.5 ounce

Mix the oil with vinegar by degrees, shaking well to prevent separation after each addition, then add the spirit and antimony, and mix thoroughly. Shake before using.