This consists of a tin cup, capable of holding about a pint of oil, with a small tube passing through the bottom and reaching nearly to the top inside. It should be placed so that the lower end of the tube will point to the centre of the bearing; if the cup is filled with oil and supplied with a wick, one end of which resting in the oil and the other passing down through the tube to the bearing, capillary attraction (the same principle that supplies combustion in the common lamp) will cause a constant dripping of oil from the wick, proportioned to its length and size. Any contrivance to raise the wick from the oil, or press upon it at the top of the tube will stop its capillary action when the shaft is not in operation.-- The Lubricator should be applied to every bearing liable to heat from excessive friction.