Journal . Fig. for Forming theSupport Wires. Fig. Hammer for FormingSpring Tension on FilamentSupporting Wire. Wire Forming.— (Fig. 6.) The tubes now carrying fourwires, next have the nickel ends straightened by then have each of the four wires passed horizontallyinto a steel die ; first the wire attached to the lower endof the filament is cut off to form the short hook andis turned over at right angles. This forms the gaugepoint for locating the wires for cutting off their finishedlength. The tube is held square by the die and the surpluswire cut off by scissors up
Journal . Fig. for Forming theSupport Wires. Fig. Hammer for FormingSpring Tension on FilamentSupporting Wire. Wire Forming.— (Fig. 6.) The tubes now carrying fourwires, next have the nickel ends straightened by then have each of the four wires passed horizontallyinto a steel die ; first the wire attached to the lower endof the filament is cut off to form the short hook andis turned over at right angles. This forms the gaugepoint for locating the wires for cutting off their finishedlength. The tube is held square by the die and the surpluswire cut off by scissors up against the face of the , the long wire which eventually holds the upperend of the filament is bent out of the way so that the welding SOME MODERN ENGINEERING PRACTICE IN AMERICA. 45. Fig. Electric Welder for Fixing Anodes and Grids shownwith a Tray of Grids. operations can be accomplished on the other two wire is then locally flattened in the drop hammer. (Fig. 7.)This unit now goes to the grid welding machine (Fig. 8),which is a spot welder wound with 200 volts on the primary. The grid is a nickel wire 0-25 mm. diameter formed into aseries of 11 coils of 4-25 mm. internal diameter, the coils arespot welded to a nickel support wire at three places. The gridis threaded on to a small mandrel having a very slight flat onthe top. At the remote end of the mandrel there is a smallshoulder against which the grid supporting wire is grid at this time is slightly less in over-all length than thefinished length so that it is placed by hand with one end levelwith the point of the mandrel nearest to the operator, and whenthe lever is pulled down to bring the welding points in contactit welds the penultimate coil in place, the unit is then drawnfo
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Keywords: ., bookcentury1800, bookdecade186, bookpublisherlondon, bookyear1861
