Journal . ere built by hand,and it was at one time thought that the human element was anessential to success. That contention, however, has been com-pletely disproved, and modern machinery—under supervision,of course—makes the best pneumatic tyres. The great weaknessof tyre construction by hand, curiously enough, is the humanelement held in such veneration in days gone by. The opera-tors attention to his work becomes distracted, or towards the endof the day he tires of what undoubtedly is an arduous task ;however it be, the canvas demands an even tension from thefirst ply to the last, and any
Journal . ere built by hand,and it was at one time thought that the human element was anessential to success. That contention, however, has been com-pletely disproved, and modern machinery—under supervision,of course—makes the best pneumatic tyres. The great weaknessof tyre construction by hand, curiously enough, is the humanelement held in such veneration in days gone by. The opera-tors attention to his work becomes distracted, or towards the endof the day he tires of what undoubtedly is an arduous task ;however it be, the canvas demands an even tension from thefirst ply to the last, and any looseness, or, on the other hand,tightness, means the ruination of the tyre. The French Mathernmachine, made in Zurich, and used in many tyre factories.,replaces the functions of the core and the duties of the operator(Fig. 4). The fabric is mounted on the core by the buildingmachine, and is neatly rolled into the shape of the tyre. Theoperator regulates the speed of the core, and the supply of canvas,. THE MOTOR CAR PNEUMATIC TYRE. 67 and in general sees that all goes well. A not unimportant advan-tage is that almost all handling of the fabric is dispensed with,perfect cleanliness being essential to successful tyre a few plies of canvas, the number depending upon the sizeof the tyre under construction, have been laid on the core, oneupon another, the work of building the casing is temporarilystopped, and the bead cores of hardened rubber covered withfabric are fitted into position. Bead cores are produced by aforcing machine in long strips of plastic compound of the requireddesign. The tyre-building machine thenceforward and until thecasing is finally completed rolls the remaining plies around thebeads coincidentally with the main body of the casing. Foradditional strength at a vulnerable point one or two narrow stripsare sunk into the beads, brought around to, and about an inchup the side of the casing, and are there enclosed within thelayers of rubber const
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Keywords: ., bookcentury1800, bookdecade186, bookpublisherlondon, bookyear1861
