【正文】
lling into ducts of small cross insulation may be oilimpregnated paper,varnished cambric, or synthetic materials such as polyethylene. The coils of generators and motors may be insulated with tapes of various of these are made of thin sheets of mica held together by a binder, and others are of fiber glass inpreating with insulating insulation must be capable of withstanding quite high operating temperatures, extreme mechanical forces, and vibration. The insulation on powertransformer windings is monly paper tape and pressboard operated under oil saturates the paper, greatly increasing its insulation strength, and by circulating through ducts, serves as an agent for carrying a way the heat generated due to RI2 losses and core losses in the shape and arrangement of condu