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One black metal hallow hair receptor covered in faille and fits over the top of the head and directs sound through the top of the 13 inch opening and then through the tube and into the ear. The bouffant hair style of the period allowed hair to be arranged on top of the aid thus concealing the device.

One table top model, dark brown metal, with a microphone built into the unit, and comes equipped with earphones. Pitch and loudness controls on top and a special switch on the side that allows for normal or hi-cut pitch adjustment.

One round silver metal apparatus with wind-up mechanism on one side, along with a shiny protruding volume control and a nipple type extrusion on one end. Designed by R. Barany as a noise maker device to mask or eliminate the contralateral ear during a monaural hearing test. The wind up mechanism produces a whirring sound that can be controlled by the volume button with the nipple extrusion inserted into the canal of the contralateral ear during a hearing test.

Brown bakelite conversation tube with funnel connected to tube with string. The funnel is screwed to the base of the tube. String is unraveled. Tube is covered with brown fabric.

One set of a simplex hearing tube as designed by Max A. Goldstein for use in the school.

Conversation tube with dark green vulcanite mouthpiece and earpiece. Rubber tubing is thick, one inch, covered with tightly woven black material.

Black metal conversation tube with metal mouthpiece and earpiece. Mouthpiece is bell shaped. Rubber tubing is thick, 1 inch, covered with tightly woven black material.

One wood box containing 5 tuning forks of different sizes. Two silver hinges and locks on box with red satin and velvet interior.

Black metal circular receptor trumpet with large mouthpiece opening with circular grillwork separated into 6 pie shaped sections. One angled metal earpiece. The tube is adjustable so that the user can angle the mouthpiece toward the source of sound.

Black lacquered metal bilateral circular receptor trumpet hearing device. There are two circular receptors back to back at the end of a single fixed tube. The receptor pans are partially covered forming two hollow convex receptors open in opposite directions. The earpiece is curved and made from vulcanite. There is a small ring on the tube section so that a user may wear it around their neck.

Dark, tarnished metal hearing device that resembles a stethoscope. It has two earpieces that hang from the ears and one funnel mouthpiece with a clip on the back of the metal funnel mouthpiece for the user to fasten to their clothing or pocket. The tubes running from each earpiece to the mouthpiece are composed of rubber.

Black metal conversation tube with mouthpiece and earpiece. Mouthpiece appears to be of different material than metal. Rubber tubing covered with tightly woven black material. Mouthpiece is indented bell shape with an interior plate with four holes.

Black metal rounded open ball receptor trumpet device with a cut opening in the ball receptor shaped mouthpiece. Earpiece is made of vulcanite. No adjustable parts.

Adjustable Resonator telescopic device, black with chipped area showing gold paint. Knob on body of device allows the size of the mouthpiece opening to be controlled. The earpiece is curved and adjustable allowing it to turn in all directions and to be inserted completely inside the mouthpiece section.

Black trumpet closed ball resonator with earpiece. No opening as per mouthpiece. Looks like a rounded vase with a earpiece protruding from the vase.

Conversation tube with a curving pipe-shaped receptor-mouthpiece and one elongated earpiece with short tube connection . Mouthpiece and earpiece are brown in color, made from vulcanite. Tubing is rubber covered with black material. Receptor-mouthpiece fits into a pocket for concealment.

Conversation tube with black vulcanite mouthpiece and earpiece. Rubber tubing is thin and covered with tightly woven green material. .

Rubber conversation tube, with dark brown metal or vulcanite mouthpiece and earpiece. Earpiece is elongated. Mouthpiece is bell shaped. Rubber tubing is thin, covered with tightly woven black material.

Invented by Lieutenant Colonel David Porter Heap of the United States Lighthouse Service, the Topophone (from the Greek 'topos' = place and 'phone' = sound) is designed to assist the ear in determining the direction from which a sound originates. Two curved metal funnels in opposition with each other at the end of a long wooden rod. Small openings at the ends of the funnels and 3.5 inch wide openings at the receptor portion of the funnels. The rod can be folded and there is a suspension ring that allows the user to wear the device and one that protrudes when the device is folded to hold in place.

Black (flat finish) metal (Brass?) trumpet device called "Marshall's Collector" as per Hawksley 1883 Catalogue. It appears to be composed of three pieces that are adjustable but not removable. The earpiece is the shortest piece and the tip is made of vulcanite, the body is 9 inches long and the funnel is 6 inches long with a 5.75 inch wide opening.