For the introductory demonstration, the teacher needs:

• ear trumpet images to show students (either print out pictures or overhead transparencies, or view website images; recommend sources: Hearing Aid Museum website at http://www.hearingaidmuseum.com/gallery.htm or Phisick's Antique Ear Trumpet Gallery available through the Deafness and Hearing website:http://phisick.com/item/rein-silver-plated-grand-opera-dome-ear-trumpet/ )
• overhead projector
• clear tub of water and various sized pebbles or marbles, to demonstrate wave propagation

Each group needs:

• scissors
• masking tape, 20 cm
• cotton balls, 2 large
• office or construction paper, 4 sheets
• blindfold
• Shhh... Do You Hear That? Worksheet, one per person
• Sounds All Around Design & Evaluation Worksheet, one per person

For the entire class to share:

• roll of paper towels
• assorted raw materials from which teams can design their own ear trumpets, such as plastic soda bottles, disposable cups, cardboard tubes, tubing and plastic sheets, as described next
• 6-8 plastic soda bottles with the bottoms cut off; get the 360 ml (12 oz) size
• 6-8 each, cups made of Styrofoam, plastic and paper; get the 180-240 ml (6-8 oz) size
• 6-8 cardboard tubes from paper towel or toilet paper rolls
• 4-6 segments clear rubber tubing, 0.7 cm inner diameter, 50-80 cm length
• 4-6 segments plastic tubing, 1.5 cm inner diameter, 10-15 cm length
• 4-6 pliable plastic sheets, 15 cm x 12 cm, available at craft stores; alternatively, use blank overhead transparency sheets
• (optional) 4 funnels of various sizes; plastic works best