. Scientific American Volume 90 Number 16 (April 1904) . single longitudinal joint. The transverse jointsare butt joints, each section being reinforced in themiddle by a brace contributing to its rigidity. Thiscylinder is watertight except in two chambers in theupper part at each extremity. When the downstreamwater level does not rise more than 3 feet or so abovethe bottom of the dam the weight of the cylinder issufficient to counterbalance the pressure; but whenthe water level rises above this limit, the water entersthe two chambers, giving the cylinder added racks in the case o
. Scientific American Volume 90 Number 16 (April 1904) . single longitudinal joint. The transverse jointsare butt joints, each section being reinforced in themiddle by a brace contributing to its rigidity. Thiscylinder is watertight except in two chambers in theupper part at each extremity. When the downstreamwater level does not rise more than 3 feet or so abovethe bottom of the dam the weight of the cylinder issufficient to counterbalance the pressure; but whenthe water level rises above this limit, the water entersthe two chambers, giving the cylinder added racks in the case of this dam are inclined at anangle of 45 degrees only along the upper part. Towardthe bottom, the pitch is increased, attaining 4 to increase in pitch is made on a radius of The steepness of the bottom part of these racksgives the dam better bearing rgainst water pressuretending to raise it. The weight of the cylinder fe193,600 pounds. The operating apparatus includes two steel cablesof inches diameter, each formed of six CYLINDRICAL DAM ACROSS THE RIVER MAIN, SCHWEINFURT, GERMANY. The two cables are rolled on drums, and to raise thecylinder above high water, that is to say, feet,an electric motor of 18 horse-power is employed, andthe operation takes less than a quarter of an mechanism is also provided with four cranks, bymeans of which the dam can be lifted by hand. Thecranks dive a worm gearing through chains, and this,in turn, meshes with a train of gears and a chain tothe hoisting drums. ^-»-» t~» — ■—- A special commission selected oj the French navalauthorities, after prolonged investigations and experi-ments with the turret guns of the battleship HenriIV., has condemned the existing arrangement of theturrets, owing to the fact that the firing of these par-ticular guns constitutes a serious menace during dis-charge to the crew attending to the guns in the lowerturret beneath them. In one experiment four sheepwere tie
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