Source: http://www.musicalads.co.uk/musical-instrument-care-guides/how-to-tune-a-tuba/
The tuba is a long pipe of wide flaring diameter and bell. Playing style is similar to the trumpet, with lips serving as resonators. Its smaller cousin is the Euphonium.
Source: http://www.musicalads.co.uk/musical-instrument-care-guides/how-to-tune-a-tuba/
Source: http://www.schillerinstruments.com/category/tubas
1900 Tonister Tuba
Source: http://www.rugs-n-relics.com/Brass/tubas/1900-Tornistertuba.html
Source: http://johnochwat.wordpress.com/2012/02/16/insert-your-tuba-player-pickup-line-here/
The tuba was invented by Wilhelm Friedrich Wieprecht and Johann Gottfried Moritz (both of Prussia) in 1835, and called basstuba. Around the middle of the 1800s it replaced the ophicleide in symphony orchestras as pitch control was more controllable and thus reliable.
The tuba is a flared pipe with a large bell, and the length of the pipe outlet is controlled by valves. Resonating lips produce sound as a Bernoulli Effect, similarly to the bugle and trumpet. Some tubas can reach frequencies as low as 20 Hz E0.
One variation on the tuba design is the sousaphone, which differs only in the orientation of the bell, while the more circular tube design allows the musician to "wear" the instrument.
http://www.beginband.com/sndclips.shtml