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The tricone, with three metal cones, designed by the first National company; The single-cone "biscuit" design of other National instruments; The single inverted-cone design (also known as a spider bridge) of Dobro brand instruments and instruments that copy the Dobro design [2]
Resonator ukuleles generally utilize a "National style" single-resonator biscuit cone, although a small number (including those made by the Dobro company in the 1930s) use a bowl resonator and spider cone. Tricone resonators, such as seen in many National resonator guitars and mandolins, are not generally used.
They had metal bodies and a tricone resonator system, with three aluminium cones joined by a T-shaped aluminium spider. Brother Rudolph Dopyera, who previously worked with Weissenborne, hand built the original tri-cone models with diamond holes, prior to the second production stamped metal bodies by engineer Adolph Rickenbacher.
The cone surround can be rubber or polyester foam, treated paper or a ring of corrugated, resin-coated fabric; it is attached to both the outer cone circumference and to the upper frame. These diverse surround materials, their shape and treatment can dramatically affect the acoustic output of a driver; each implementation has advantages and ...
The axis of a cone is the straight line passing through the apex about which the cone has a circular symmetry. In common usage in elementary geometry, cones are assumed to be right circular, i.e., with a circle base perpendicular to the axis. [1] If the cone is right circular the intersection of a plane with the lateral surface is a conic section.
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Often the cone-in-cone will be found as features of calcite layers within a shale, [5] and rarely within a dedolomite (calcitized dolomite). [6] Cone-in-cone structures should not be confused with either shatter cones such as are produced by meteorite impacts, or with shear cones like those developed in coals. Both these structures differ from ...
The pyrometric cone is "A pyramid with a triangular base and of a defined shape and size; the "cone" is shaped from a carefully proportioned and uniformly mixed batch of ceramic materials so that when it is heated under stated conditions, it will bend due to softening, the tip of the cone becoming level with the base at a definitive temperature.