""THIS book is one of the series of handbooks on industrial subjects
being published by the Popular Mechanics Co. Like the magazine, these
books are ""written so you can understand it,"" and are intended to
furnish information on mechanical subjects at a price within the reach
of all. ""The texts and illustrations have been prepared expressly for
this Handbook Series, by experts; are up-to-date, and have been revised
by the editor of Popular Mechanics.""