In 'The Motor Girls on the Coast; or, The Waif From the Sea' by Margaret Penrose, readers are taken on a thrilling adventure with the Motor Girls as they find a mysterious girl washed up on the shores and set out to solve the mystery. Penrose's writing style is captivating and filled with suspense, making this a compelling read for fans of early 20th-century girls' adventure novels. The book is set in a time when young adult literature was flourishing, and Penrose's contribution to the genre is significant. The attention to detail in describing the coastal scenery and the characters' actions adds depth to the story, engaging readers from start to finish. Margaret Penrose's ability to craft a plot that combines elements of mystery, friendship, and daring escapades showcases her talent as a skilled storyteller. Known for her series of children's books, Penrose drew inspiration from her own experiences and interests, capturing the imaginations of young readers with relatable characters and exciting plots. 'The Motor Girls on the Coast; or, The Waif From the Sea' is recommended for those looking for an adventurous and well-written novel that celebrates friendship and courage in the face of challenges.

Margaret Penrose was a house pseudonym used by the Stratemeyer Syndicate. Created by Edward Stratemeyer, the Stratemeyer Syndicate was the first book packager to have its books aimed at children, rather than adults. The Syndicate was wildly successful; at one time it was believed that the overwhelming majority of the books children read in the USA were Stratemeyer Syndicate books, based on a 1922 study of over 36,000 children country-wide.

Margaret Penrose was one of the various pen names used by the Stratemeyer Syndicate to put out popular series of kids books. The Penrose name was used for Dorothy Dale, the Radio Girls, and the Motor Girls series.

The following book is a treatise on electric motors written by J. S. Zerbe, intended for an audience of young boys. The opening chapters, which treat the fundamentals, lay a foundation for the work we shall be called upon to perform, when we treat the structures of the different parts and devices in the various types of motors. The object of this book in general is to explain power in its various phases, how derived, and the manner in which advantage is taken of the elements, and substances with which we are brought into contact.