BY THE SAME AUTHOR. LOGARITHMS FOR BEGINNERS. "An extremely useful and much-needed little work, giving a complete explanation of the theory and use of logarithms, by a teacher of great clearness and good style." — The Mining Journal. THE INDICATOR : ITS CONSTRUCTION AND APPLICATION. ["Thk Indicator Handbook" : Part I.]. "A valuable little volume. . . . Mr Pickwortb's judg- ment is always sound, and is evidently derived from a personal acquaintance with indicator work." — The Engineer THE INDICATOR DIAGRAM: ITS ANALYSIS AND CALCULATION. ["The Indicator Handbook": Part II.]. "An excellent guide to the intelligent interpretation and use of the diagram. Of high value to the practical engineer. " — Marine Engineering. POWER COMPUTER FOR STEAM, GAS, AND OIL ENGINES. "Accurate, expeditious, and thoroughly practical. . . . We can confidently recommend it, and engineers will find it a great boon in undertaking tests, etc." — The Electrician. 0. N. PIOKWOEiTH, FALLOWFIELD, MANCHESTER.
