The London, Edinburgh and Dublin philosophical magazine and journal of science . rass cylinder covered with smoked paper wasdisposed, the hair making a mark on the paper at each turn ofthe axis of the turbine. The time interval corresponding to the interval betweentwo marks made by the hair, and hence the number of turnseffected per second by the rotating axis, was deduced in theusual manner from a comparison with the oscillation curveof an electromagnetic tuning-fork (whose period of oscillationwas accurately known), recorded on the same cylinder. A conveniently regulated clockwork was fitted
The London, Edinburgh and Dublin philosophical magazine and journal of science . rass cylinder covered with smoked paper wasdisposed, the hair making a mark on the paper at each turn ofthe axis of the turbine. The time interval corresponding to the interval betweentwo marks made by the hair, and hence the number of turnseffected per second by the rotating axis, was deduced in theusual manner from a comparison with the oscillation curveof an electromagnetic tuning-fork (whose period of oscillationwas accurately known), recorded on the same cylinder. A conveniently regulated clockwork was fitted with acontrivance enabling the cylinder to effect one turn only,with suitable velocity, so that the cylinder, after a smallfraction of a turn (say about £), reached a fairly constantspeed. Fig. 2 (p. 10) represents a general view of the turbine, therotating cylinder, and the tuning-fork. Two solid iron rods, fastened on the turbine columns,carried a small frame with the photographic plate, whosedimensions were 3x 12 cm. 10 Prof. A. Battelli and Mr. L. Magri •i on Vicr. 9. The spark to be photographed was produced in A (fig. 3)within a large wooden box, intercepting any irradiation oflight by the spark.
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Keywords: ., bookcentury1800, bookdecade1840, bookidlondon, booksubjectscience
