[45] FISHERIES OF THE UNITED STATES. 557 



LIST OF PLATES ILLUSTRATING THE DEEP-SEA SOUNDING- AND 

 DREDGING APPLIANCES OF THE STEAMER BLAKE DURING HER 

 EXPLORATIONS OFF THE SOUTHERN AND EASTERN COAST OF THE 

 UNITED STATES, FROM 1874 TO 1879.* 



Plate 1. The United States Coast Survey steamer G. S. Blake, 350 

 tons, fitted for deep-sea sounding and dredging. 



Plate 2. Fig. 1, Miller-Casella thermometer case, fitted with Sigbee's 

 spring clamp. Above is shown a piece of the sounding- wire. Fig. 

 2, sounding-rod; a slight modification of Captain Belknap's sound- 

 ing-cylinder No. 2, with Sigsbee's detacher. The construction is 

 shown on plate 39. 



Plate 3. Fig. 1, Miller-Casella thermometer case fitted with Sigsbee's 

 spring clamp. Fig. 2, sounding-rod; a slight modification of Cap- 

 tain Belknap's sounding-cylinder No. 2, with Sigsbee's detacher. 



Plate 4. Showing some of the causes, probable and real, of the occa- 

 sional failures of sinkers to detach. 



Plate 5. Fig. 1, cans for observing currents. Fig. 2, sounding-lead, 

 fitted with Stellwagen specimen cup. 



Plate 0. Showing the general form and working of Sir William Thom- 

 son's sounding-machine as used on board the Blake during her 

 first season in the Gulf of Mexico ; rigged for paying out. 



Plate 7. Experimental form of the Sigsbee machine for sounding with 

 wire ; used for three years on board the Blake ; rigged for paying 

 out. 



Plate 8. The latest form of the Sigsbee sounding-machine as now used 

 on board the Blake; rigged for paying out. The construction is 

 shown in plates 3fi, 37, and 38. 



Plate 9. The Sigsbee sounding-machine, rigged for paying out. 

 (Second view.) 



Plate 10. The Sigsbee sounding-machine, rigged for x>aying out. 

 (Third view.) 



Plate 11. The Sigsbee sounding-machine, rigged for reeling in, with 

 the strain pulley brought into use. 



Plate 12. The Sigsbee sounding-machine folded for transportation. 



Plate 13. The Sigsbee sounding-machine in position on the Blake; 

 run out for work ; front view. 



Plate 14. The Sigsbee sounding-machine in position; run in, with the 

 tubes lowered and the accommodation grating triced up. 



Plate 15. The Sigsbee sounding-machine in position, run out for 

 work ; side view. 



Plate 16. New steel reel for sounding with wire, devised by Lieut. 

 Commander C. D. Sigsbee. 



* Extracted from "Deep-Sea Sounding and Dredging, a Description and Discussion 

 of the Methods and Appliances used on board the Coast and Geodetic Survey Steamer 

 Blake, by Charles D. Sigsbee, Lieutenant-Commander U. S. Navy; Assistant in the 

 Coast and Geodetic Survey," Washington, 1880, 



