The wonders of modern mechanismA résumé of recent progress in mechanical, physical, and engineering science . BRAZING A BICYCLE FRA3IE. illustrated. Brazing is not equal in strength to welding,therefore the joints are lapped to allow of the brazing of a Fi(i. THE WAVERLEY BRAZED JOINT. larger surface and to get greater strength. Borax and zincare used to assist the brazing, and when the work is done 156 WONDERS OF MODERN MECHANISM. and cooled it is washed in acidulated water to remove theborax. The frame then goes to a filer, who smooths upthe joints, taking extreme care not to weaken the
The wonders of modern mechanismA résumé of recent progress in mechanical, physical, and engineering science . BRAZING A BICYCLE FRA3IE. illustrated. Brazing is not equal in strength to welding,therefore the joints are lapped to allow of the brazing of a Fi(i. THE WAVERLEY BRAZED JOINT. larger surface and to get greater strength. Borax and zincare used to assist the brazing, and when the work is done 156 WONDERS OF MODERN MECHANISM. and cooled it is washed in acidulated water to remove theborax. The frame then goes to a filer, who smooths upthe joints, taking extreme care not to weaken them. Theframe is then polished with an emery stick and brush, andenamelled. For pedals, the rat-trap styles are becoming more com-mon than the rubber. They are made of sheet steel,stamped into a pattern. The foot-rest also is usuallystamped, as well as numerous minor parts which arecheaply formed in this way. The saddle-post, in the best makes, is hollow, and of T-form. The saddle-springs are made in so many patternsthat no shape can be said to be standard. Any one of adozen forms gives equally good results. Two wires, withnumerous curves, form the prevailing types. The wire isof the best spring steel, and has to be very accuratelytemjjcred. Some ingenuity i
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