Speaking trumpets served as naval voice amplification for centuries.
Evidence
Morland stated very clearly the benefits this instrument might have at sea. (The speaking trumpet was once an essential instrument for amplification and direction of the voice used by the British Royal Navy for communication between ships.) — Eric J. Heller, Why You Hear What You Hear- An…, 567
Categorization
Category: Factual Claims
Related
- The speaking trumpet was the only voice amplification system for centuries (similarity 0.94)
- The simple bell-boosts-treble explanation of trumpet tone is incomplete. (similarity 0.78)