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Updated: May 2, 2025
The brake then acts, and the crank stops after making a revolution of 180 deg., and immersing the zincs to a maximum depth. In order to extinguish the lamp, it is only necessary to press the button, B, again. The axle, M, will then make another half revolution, and, when it stops, the zinks will be entirely out of the liquid. The depth of immersion is regulated by fixing the crank-pin.
If the axle, M, be given a continuous revolution, it will communicate to the rod, A, an upward and downward motion that will be transmitted to the beam and produce an alternate immersion and emersion of the zincs. Upon stopping the jack at certain properly selected positions of the rod, MD, the zincs may, at will, be kept immersed in the liquids, or vice versa. This is brought about by Mr.
The platina is shorter than the zincs, to prevent its reaching the quicksilver in the bottom of the cell; and the wax balls on its sides are to insulate it from the zinc plates. This platina should never be allowed to touch the mercury or the zinc. Let the plates, properly screwed together, be now placed in the cell with the Battery Fluid.
Viewed in this light its negative pole or end is the battery fluid, next to the positive surfaces of the zinc plates, and its positive pole or end is the brass clamp which, holding the metals together, is in contact with the outer and negative surfaces of the zincs.
G. Mareschal has invented and had constructed an ingenious system that we shall now describe. Mr. The axis, M, of the jack, on revolving, carries along a crank, MD, to which is fixed a connecting-rod, A, whose other extremity is attached to the horizontal beam that supports the zincs and counterpoises.
I do not know what he did in the workshop, but he certainly did not add to its brilliance by his appearance. We saw him all the time hanging around the 'zincs. His highly interested little face amused us. When we landed, he watched us with such admiration and envy! He asked us endless questions and constantly wanted explanations. Without seeming to do so, he was learning.
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