Tracts on Mathematical and Philosophical Subjects, Vol. 3 of 3: Comprising, Among Numerous Important Articles, the Theory of Bridges, With Several Plans of Recent Improvement (Classic Reprint) - Softcover

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Excerpt from Tracts on Mathematical and Philosophical Subjects, Vol. 3 of 3: Comprising, Among Numerous Important Articles, the Theory of Bridges, With Several Plans of Recent Improvement

IN the course of last year's Operations we experienced several inconveniences from some parts of our apparatus, which we determined to remedy if possible. These regarded chiefly the time-pieces, the axes of vibration, and the method of measuring by the tape. For measuring the tin of a certain number of vibrations, we united the use of a second stop' watch with a simple half-second pendulum, made of a Ieaden bullet suspended by a silken thread, which did not always\ agree together. Again, the axes of the gun and pendulum frames were not found to be so devoid of friction as might he wished. But, above all, the chief cause of dissatisfaction, was the method of maasur ing the extent of the vibrations by meansof the tape; which was, notwithstanding all possible care and precaution, still subject to much irregularity,'by being wetted by rain, or blown aside by the wind, or otherwise entangled, which rendered the measurements doubtful and irregular.

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