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It must have weighed at least twenty or thirty tons, and was clearly moved upon some simple balance principle of counter-weights, probably the same as that by which the opening and shutting of an ordinary modern window is arranged.
There are no tools there now, and one of my men discovered that you can pull up the whole of the floor, it works on a hinge and is balanced with counter-weights." Mr. Rennett nodded. "I believe it was used as a wine cellar by a former tenant of the house," he said coolly. "We have no cellars at the Grange, you know. I do not drink wine, and I've never had occasion to use it."
Cuvercles of wood, placed on clarificadoras, accelerated the evaporation, and led me to believe that a system of cuvercles and moveable frames, furnished with counter-weights, might extend to other cauldrons.
Pollux informs us, that there were trap-doors for ghosts, furies, and the infernal deities. Some under the doors, on one side, introduced the rural deities, and on the other the marine. The ascents or descents were managed by cords, wheels, and counter-weights.
In the screw engine referred to, as the cylinder is laid upon its side, there is no unbalanced weight to be lifted up every stroke, and the crank, whereby the screw shaft is turned round, consists of two discs with a heavy side intended to balance the momentum of the piston and its connections; but these counter-weights by their gravitation also prevent the connecting rod and crank from continuing in the same line when the engine is stopped, and in fact they place the crank in the most advantageous position for starting again when it has to be set on.
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