Globe Auditube The Globe Auditube was manufactured by the Globe Ear-Phone Company around 1912. This conversation tube is 45 inches in length and has a bell opening of 2.5 inches. It was apparently produced in three sizes, priced $5.00, $5.50 and $6.00 for the small, medium and large. (The one shown here is likely the large one, but can't be sure.) It uses a diaphragm ear piece which provides a high frequency boost to the listener. This diaphragm ear piece is similar to that employed on the Otophone made by E.B. Meyrowitz around 1887. |  | Click picture for larger view | | |
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