This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1913 Excerpt: ... a purely academic character, for it is of much practical importance to know the exact position of the industrially important critical points. Daring, indeed, and reckless, the one who would face Professor Howe's formidable battery of facts in an attempt to dislodge from the intrenched position where he has placed them the points Ael and Ae3. For my part, I am well satisfied with these positions, and I think they should be used in the construction of future equilibrium diagrams. The determination of the position of the Ae3 point by micrographic methods by Professor Howe and Mr. Levy is a beautiful piece of work, indicative of manipulative skill of a high order. The mechanism of the reabsorption of ferrite as hypo-eutectoid steel is heated through its critical range, so well described on p. 1090, is most interesting and suggestive; for upon that absorption depends essentially the effectiveness of the annealing of such steels. Professor Howe's discussion of the existing data as to the position of Ae3 is a scholarly production of such nature as to preclude adverse criticism. The author has so well anticipated every possible objection to his treatment of the subject as to afford little comfort to the critically inclined reader, --a feature, it might be added, so characteristic of Professor Howe's writings. I should like to say a few words in regard to the determination of the line SE. I should like to call attention to the fact that the determination of that line is not of the same industrial importance as the determination of the GrOS line of hyper-eutectoid steel, because the latter indicates the proper annealing temperature for such steel, it being essentially the refining temperature of hyper-eutectoid steel, and therefore of very great industrial importance...