Question

What is a speaking tube? What is its use?​

Answer 1

Answer:

You speak in that tube...simple

IQ 200++++

Answer 2

$\huge\underline\orange{Speaking\:Tube}$

speaking tube or voicepipe is a device based on two cones connected by an air pipe through which speech can be transmitted over an extended distance. Use of pipes was suggested by Francis Bacon in the New Atlantis.