Photo No. 2. "Hallo! are you there?" Telephoning to the Diver below
Submarine Appliances And Their Uses - 1911
Dykkertelefoner
Illustrationer
Photo No. 17. SINGLE DIVER TELEPHONE
Submarine Appliances And Their Uses - 1911
Photo No. 18. DOUBLE DIVER TELEPHONE (GRAHAM & DAVIS' PATENT). See page 32
Submarine Appliances And Their Uses - 1911
Direction-Indicator and Receiving Telephone
Submarine Appliances And Their Uses - 1911
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