Machine Design

Whilst the greatest effort has been made to ensure the quality of this text, due to the historical nature of this content, in some rare cases there may be minor issues with legibility. The remaining part will be soft and easily machined. The chilling is effected by using iron sections faced with a light coat ing of loam at the points to be chilled. Iron car-wheels are made in this way, thus giving a chilled tread to resist wear, while the hub is soft, permitting of easy boring for the axle. The thickness of the chilled portion may vary from inch to 78 inch or more, depending upon the iron mixture and the method of chilling.