Kramarae, Cheris. Technology and Women's Voices: Keeping in Touch. New York: Routledge & Kegan Paul, 1988. Both Samuel Morland and Athanasius Kircher have been credited with inventing megaphones around the same time in the 17th century. Morland, in a work published in 1655, wrote about his experimentation with different horns. His largest megaphone consisted of over 20 feet of copper tube and could reportedly project a person's voice a mile and a half. [2] Our megaphone, or loud hailer, range offers excellent value for money products. The loudest of our range of megaphones is the Since the 1960s the voice-powered acoustic megaphone described above has been replaced by the electric megaphone, which uses a microphone, an electrically-powered amplifier and a folded horn loudspeaker to amplify the voice.

The Sirenco Megaphone is built for performance and durability. With its robust construction and advanced sound amplification technology, your voice will reach far and wide, ensuring your announcements are heard even in noisy environments.A small compact megaphone that uses very high frequencies that penetrate and carry, while using little power, up to 700 metres. Very economical on batteries FITTED WITH RECHARGEABLE LITHIUM ION BATTERIES 8,800ma; OR USE WITH CAR CIGARETTE LIGHTER; WITH 12 MONTH GUARANTEE; VOICE+SIREN R3,300 Twice the power with two 30 watt PA outputs. You can connect one PA forward and one aft, or transmit out of both simultaneously.

This modern robust LED Light as a handy LED light allow the user to select between bright, dim or flashing. It is perfect for camping and other applications where a cordless light is required. The high bright intensity LED design allows for excellent visibility in the day and night. It is a battery operated portable beacon with a magnetic base and includes a wall and car Charger. With 8 warning signals, including fog horn, vessels around will be notified of your presence and it will prevent own ship from collisions.This article needs additional citations for verification. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed. Man using megaphone with separate microphone Impact on society [ edit ] Silent film director D. W. Griffith using megaphone in 1922

Montgomery, Henry C. (1959). "Amplification and High Fidelity in the Greek Theater". The Classical Journal. 54 (6): 242–245. JSTOR 3294133. The VLH-3000A is designed to keep a uniform look on your boat when used in conjunction with other Standard Horizon equipment.

The term 'megaphone' was first associated with Thomas Edison's instrument 200 years later. In 1878, Edison developed a device similar to the speaking trumpet in hopes of benefiting the deaf and hard of hearing. His variation included three separate funnels lined up in a row. The two outer funnels, which were six feet and eight inches long, were made of paper and connected to a tube inserted in each ear. The middle funnel was similar to Morland's speaking trumpet, but had a larger slot to insert a user's mouth. [4] A megaphone, also known as a speaking-trumpet, bullhorn, or loud hailer, is a portable and hand-held cone-shaped acoustic horn. Its purpose is to amplify a person’s voice or other sounds and direct them in a specific direction. Sound is introduced into the narrow end by holding it up to the face and speaking into it, with the resulting sound waves radiating out from the wide end.

Morland favored a straight, tube-shaped speaking device. Kircher's horn, on the other hand, utilized a "cochleate" design, where the horn was twisted and coiled to make it more compact. Featuring adjustable volume controls and a range of useful features, the Sirenco Megaphone provides unequalled flexibility. Its ergonomic design and lightweight build make it easy to carry and handle, allowing you to effectively communicate over extended periods.left) Woman using a small handheld electric megaphone at a demonstration in Portugal. (right) Electric megaphones use a type of horn loudspeaker called a reflex or reentrant horn. The sound waves travel in a zigzag path through concentric widening ducts (b, c, and d).