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ONE:The steam cylinder which moves the hammers is set in the earth at some depth below the plane upon which they move, and even when the heaviest work is done there is no perceptible jar when one is standing near the hammers, as there always is with those which have a vertical movement and are single acting.Starting in the early morning of August 15th, I arrived at Vis�� without much trouble, after having been led across the Lixhe bridge once more. Since my first visit the bridge had been destroyed three times over, and this new one seemed very weak. As I stood there looking at it, a motor lorry had to cross it, and the bridge gave way near the bank. Another motor had then to pull the lorry up to the top of the bank, and this made the bridge give way still further. ONE:The articles alluded to were suggested by observations made in actual practice, and by noting a "habit of thought" common among learners, which did not seem to accord with the purely scientific manner in which mechanical subjects are now so constantly treated.To avoid imperfection in the running spindles of lathes, or any lateral movement which might exist in the running bearings, there have been many attempts to construct lathes with still centres at both ends for the more accurate kinds of work. Such an arrangement would produce a true cylindrical rotation, but must at the same time involve mechanical complication to outweigh the object gained. It has besides been proved by practice that good fitting and good material for the bearings and spindles of lathes will insure all the accuracy which ordinary work demands.

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