How to Lubricate Antique Mechanical Transits
Transits, which were originally referred to as theodolites, are brass instruments that were originally used for surveying. These instruments need to be cleaned and oiled to keep them functioning properly. Fortunately, if you've ever had to apply oil to a squeaky hinge in your door, then you have the basic knowledge you need to oil up an old transit.
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Instructions
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Clean off all dust or dirt from the transit. Wipe it with a clean, soft cloth. If necessary used a can of compressed air -- the sort that you use to clean between computer keys -- to blow away dust or dirt in hard-to-reach places. Always clean the instrument right after use.
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Gently apply oil to the moving parts. Watch oil is the recommended oil for temperate climates. Use your finger or a hypodermic needle to drop small amounts of oil onto the component parts.
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Work the mechanisms. Make sure that all parts are properly coated in oil and that they work smoothly. If there is any resistance, or if there is too much friction, apply more oil, and then test the mechanism again to see if it moves more easily.
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Store the transit in a safe place protected from dust and dirt. Wrap it up in a clean leather chamois, and put it in a case to keep your antique surveying instruments clean and functioning.
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Tips & Warnings
If you are going to use your theodolite in freezing or subzero temperatures, graphite lubricant is recommended rather than liquid watch oil.
