serviced when necessary, the bearing life can be prolonged indefinitely. It is not necessary to replace the lubricant on sealed ball bearing machines as they are permanently lubricated for the life of the bearing. These machines can be recognized by the absence of grease openings in the bearing housings. KEEP THE MACHINE SERVICED. It is best to completely disassemble and overhaul a machine once a year unless adverse conditions warrant more frequent attention. All parts should be thoroughly cleaned and kept covered till assembly, and worn parts replaced with spares kept in stock for such emergencies, All parts should be kept clean, connections made secure, and the lubricant checked after assembly before the machine is again put in operation. If all these precautions are taken and your machine gets the attention it requires for smooth uninterrupted service, the time and effort spent will be well worth the reward in top performance. OPERATION BEFORE STARTING 1. Machines that have been subjected to dampness in shipment or storage should be thoroughly dried out before being placed in service, Instructions for dyring out and for insulation resistance tests are given further on under "Maintenance", Check the voltage stamped on the nameplate to see that it agrees with that of the power supply or the supply system.