CHILION WOOD FRAME.
The makers of the Eagle still continue to use what they call their cold-swaged process in all the joints of the tubing they use. The process consists of placing a tube inside of a tube, and then cold swaging the double tube to the required thickness and length. The Eagle people say that through this method they know exactly how thick their tube is at every point, and which the makers of tubing as ordinarily swaged do not.
The Luthy frame is made with outside lap-joint, taper-tongued reinforcements, which extend along the sides of the uprights and reaches and brace the frame against both perpendicular and colliding strain and prevent granulation at the corners by transmitting the vibration to the centres of the reaches, where the vibrations are thrown off.
The Iroquois frame is fitted with three-inch eccentric chain adjuster at the crank-hanger group. The rear wheel is always centred and provided with two sprockets to allow a change of gear. A peculiar feature of this frame is that while it is of the three-crown construction, with forged arched crowns front and rear, and D shape tubing in the backstays and rear forks, the joints are not flush but outside joints and nickel-plated.
WOLFF-AMERICAN
FLUSH JOINT.
A few makers are still making cushion frames, which were largely shown by a number of makers at the cycle shows of 1897. Before the advent of the pneumatic tire there was some reason for the use of cushion and spring frames, but certainly with the comfortable seats now made and the pneumatic tire in addition, cushion frames of any sort are uncalled for.