Photo No. 18. DOUBLE DIVER TELEPHONE (GRAHAM & DAVIS' PATENT). See page 32 Submarine Appliances And Their Uses : Deep Sea Diving, &c., &c. - 1911
Photo No. 17. SINGLE DIVER TELEPHONE Submarine Appliances And Their Uses : Deep Sea Diving, &c., &c. - 1911
HELMET AND CORSLET DISCONNECTED TO SHOW DETAILS Submarine Appliances And Their Uses : Deep Sea Diving, &c., &c. - 1911
HELMET AND CORSLET DISCONNECTED TO SHOW DETAILS Submarine Appliances And Their Uses : Deep Sea Diving, &c., &c. - 1911
Photo No. 13. (d) For regulating by hand Submarine Appliances And Their Uses : Deep Sea Diving, &c., &c. - 1911
Photo No. 13. (c) For regulating by pressing the head against it, inside the helmet Submarine Appliances And Their Uses : Deep Sea Diving, &c., &c. - 1911
Photo No. 13. (b) For regulating by hand Submarine Appliances And Their Uses : Deep Sea Diving, &c., &c. - 1911
Photo No. 13. (a) For regulating by hand Submarine Appliances And Their Uses : Deep Sea Diving, &c., &c. - 1911
Photo No. 8. Recompression Chamber, as referred to on page 7 Submarine Appliances And Their Uses : Deep Sea Diving, &c., &c. - 1911