Resonator ukulele
Overview
 
A resonator ukulele or "resophonic ukulele" is a ukulele
Ukulele
The ukulele, ; from ; it is a subset of the guitar family of instruments, generally with four nylon or gut strings or four courses of strings....

 whose sound is produced by one or more spun aluminum cones (resonator
Resonator
A resonator is a device or system that exhibits resonance or resonant behavior, that is, it naturally oscillates at some frequencies, called its resonant frequencies, with greater amplitude than at others. The oscillations in a resonator can be either electromagnetic or mechanical...

s
) instead of the wooden soundboard
Sounding board
A sound board, or soundboard, is the surface of a string instrument that the strings vibrate against, usually via some sort of bridge. The resonant properties of the sound board and the interior of the instrument greatly increase loudness over the string alone.The sound board operates by the...

 (ukulele top/face). These instruments are sometimes referred to as "Dobro
Dobro
Dobro is a registered trademark, now owned by Gibson Guitar Corporation and used for a particular design of resonator guitar.The name has a long and involved history, interwoven with that of the resonator guitar...

 ukuleles," however the term "Dobro" is currently trademarked by the Gibson Guitar Corporation
Gibson Guitar Corporation
The Gibson Guitar Corporation, formerly of Kalamazoo, Michigan and currently of Nashville, Tennessee, manufactures guitars and other instruments which sell under a variety of brand names...

.

The resonator ukulele is a descendant of the resonator guitar
Resonator guitar
A resonator guitar or resophonic guitar is an acoustic guitar whose sound is produced by one or more spun metal cones instead of the wooden sound board . Resonator guitars were originally designed to be louder than conventional acoustic guitars which were overwhelmed by horns and percussion...

. The resonator guitar was originally designed to be louder than conventional acoustic guitars, which were overwhelmed by horns and percussion instruments in dance orchestras.
 
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