Questions and answers constitute the principal medium for acquiring technical information, and engineering apprentices should carefully study the philosophy of questions and answers, just as he does the principles of machinery. Without the art of questioning but slow progress will be made in learning shop manipulation. A proper question is one which the person asked will understand, and the answer be understood when it is given; not an easy rule, but a correct one. The main point is to consider questions before they are asked; make them relevant to the work in hand, and not too many. To ask frequent questions, is to convey an impression that the answers are not considered, an inference which is certainly a fair one, if the questions relate to a subject demanding some consideration. If a man is asked one minute what diametrical pitch means, and the next minute how much cast iron shrinks in cooling, he is very apt to be disgusted, and think the second question not worth answering.Neither sixteen-year-old Larry Turner nor Dick Summers, a year his junior, had any more fear than had Sandy Maclaren, hardly thirteen and seated just back of the pilot who, in flying the four-place, low-wing airplane, had called back reassuringly.The advantages gained by milling, as stated, are speed, duplication, and accuracy; the disadvantages are the expense of preparing tools and their perishability.
Director
(1.) Why does machinery involve so many cylindrical forms?(2.) Why is it desirable to have separate feed gear for turning and screw cutting?(3.) What is gained by the frictional starting gearing now applied to the finer class of lathes?(4.) How may the alignment of a lathe be tested?(5.) What kind of deviation with a lathe carriage will most affect the truth of work performed?(6.) How may an oval hole be bored on a common slide lathe?(7.) How can the angular [128] ways of a lathe and the corresponding grooves in a carriage be planed to fit without employing gauges?(8.) Give the number of teeth in two wheels to cut a screw of ten threads, when a leading screw is four threads per inch?There was nobody to turn to, nobody to advise her now, but Balmayne. He had done pretty well on the whole; he had contrived to keep himself out of danger, and at the first sign of the collapse he would fly.The life preserver snapped out of his hand! Larry muttered, giving up his effort to locate the moving objects in the glass and using his unaided eyes to view the tragedyor whatever it would prove to be.48