The Civil engineer and architect's journal, scientific and railway gazette . ose, that in the case ofa floating body, whose momentum is so easily and precisely ascer-tainable, the result would be more exact and unquestionable. The method adopted by M. de Pambour, for ascertaining theamount of resistance to the motion of railway trains, by the cir-cumstances attending their descent and stoppage upon two consecu-tive inclined planes, is based upon precisely the same principle asthat here advanced. It remains only to copsider, by what means the variable velocityof the vessel can be measured, so a
The Civil engineer and architect's journal, scientific and railway gazette . ose, that in the case ofa floating body, whose momentum is so easily and precisely ascer-tainable, the result would be more exact and unquestionable. The method adopted by M. de Pambour, for ascertaining theamount of resistance to the motion of railway trains, by the cir-cumstances attending their descent and stoppage upon two consecu-tive inclined planes, is based upon precisely the same principle asthat here advanced. It remains only to copsider, by what means the variable velocityof the vessel can be measured, so as to ascertain it, at any instant,with the necessary precision. In the absence of a better, the fol-lowing arrangement might perhaps he adopted with advantage :— To the bowsprit of the vessel (Fig. 1), sufficiently a-head to bebeyond the disturbed water, should be screwed a small iron bracket, carrying a pin, which should pass through a hole in aslender rod, hanging down below the surface of tlie water, andprolonged a few inches upwards above the bracket. Upon this Fig. metal sphere should be fitted, so as to be fixed at any requireddistance from the point of suspension ; from the upper extremitvof the rod, a small cord or wire should be brought, passing to someconvenient spot on the fore-part of the deck, where it should beattached to one arm of a rectangular lever, whose other arm orindex should move along an arc of metal. It will be clear, that when the vessel is at rest in the water, therod, with the sphere attached, will hang vertically, and the cordbeing properly adjusted, the index of the bent lever will be hori-zontal, at which position the zero of the graduated arc should bemarked. If the vessel moves through the water, the resistance outhe sphere will throw the rod out of the perpendiculai-, as indi-cated by the dotted line, and the angle which it makes with itsformer position, will be shown by the new position of the index onthe metal arc. It is obvious,
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