speaking trumpet การใช้

• Taking his speaking trumpet, he asked the stranger, " What ship is that ?"
• The Loyal Nine rewarded Mackintosh with a gilt uniform and a speaking trumpet for the occasion.
• The church displays a " tuba stentoro-phonica ", or a speaking trumpet, one of only eight in the country.
• The rest, including leather helmets, fire buckets, speaking trumpets, uniforms, banners and more, has been warehoused at the Heritage Society.
• The middle funnel was similar to Morland s speaking trumpet, but had a larger slot to insert a user s mouth.
• In 1878, Edison developed a device similar to the speaking trumpet in hopes of benefiting the deaf and hard of hearing.
• To communicate with passengers and crew, a speaking trumpet was fitted to the rooms of the captain and pilot, just aft of the wheelhouse.
• His own inventions included the velocentimeter, a watch for timing railway trains, and a gutta percha speaking trumpet, the " telakouphanon ", proposed to the British Association.
• On the block were more than 500 lots from the 18th, 19th and 20th centuries, including early lanterns and engine lamps; helmets, parade hats and speaking trumpets.
• Ballast, in the form of 10-and 20-speaking trumpet, carrier pigeons, iron pins, ropes for anchoring the airship, a reserve supply of fuel and water, and a fire extinguisher ".
• Hautefeuille also conducted investigations in acoustics, investigating the action of speaking trumpets, and wrote an essay on the cause of lenses, and suggested a method of raising water using the explosive action of gunpowder.
• Also on view are early-19th-century leather fire buckets; hand-held alarm rattles and muffin bells, used to alert the public to fire danger; and speaking trumpets, horns used by officers who ran ahead of the pumper and needed a means of shouting orders over the roar of a fire.