From the National Music Museum:
“This instrument is one of only two surviving over-the-shoulder cornets featuring three valves and five keys made by E. G. Wright.”

Apparently cornets with both valves and keys were cutting edge at the time because they combined both old and new brass instrument technologies.

Lip-vibrating instruments like the cornet, French horn, and the [...]

The dual-chamber didgeridoo is an illusive instrument to find on the internet but I did find this side-ways video of two people playing the same didge.. *jaw drop* ..at the same time! Think of the possibilities…

The didgeridoo (or didjeridu) is said to be the oldest wind instrument, dating back 1500 years to Aboriginal Austrailia. [...]