A book of 25 tests which will enable you to gauge your aptitude along mechanical lines. Three types of tests, some based on aptitude, some on common sense, some on knowledge or background in the field. The tests cover arithmatic, location, precision, pattern and dot tapping, checking, alertness, blueprint reading, personality, etc. etc. With the demand for men and women for factory work as imperative as it is, this book should help potential workers to determine their qualifications.