The bugle
cornu
It was called the "cornu".
The G-shaped brass instrument used by the Roman army for communicating orders is known as the "tuba." This instrument, which resembles a long, straight tube, was primarily used to relay commands and signals during battles and military maneuvers. Its loud, piercing sound made it effective for communication over long distances in the chaos of warfare. The tuba was an essential part of the Roman military's signaling system.
Hebrew was originally used for speaking and communicating. It still is used for that.
Tuba is the straight trumpet. The curved trumpet used by the military to signal orders, etc. was called a "bucina" and was blown by a bucinator.
A wind instrument used by the Hebrews
yes, you can flash Morse code with torches. It is very effective in the dark, and was commonly used on ships for communicating in storms and darkness.
How power can be used and abused
For communicating with peripheral devices.
The instrument that is used to study cells is a microscope.
Force meter is the instrument used in measuring force.
This instrument is a balance.