554 FISHERIES OF THE UNITED STATES. [42] 



Plate 3. The hoisting engine on the forward deck, seen from in front, 

 with the reel partly filled with wire dredge-rope. The register for 

 recording the amount of rope out is seen at the base of the dredging 

 boom, which is lowered. The pilot house occupies the background. 



Plate 4. Starboard side of the forward main deck, looking aft, as ar- 

 ranged for the use of the naturalists while dredging. The table 

 sieve stands in the foreground, and the swinging work table, with 

 bottles and dishes, is seen beyond it. 



Plate 5. The after part of the hurricane deck, with the dredging ap- 

 paratus distributed over it, and the sounding machine in position 

 at the stern. 



Plate 6. The table and cradle sieves dismantled on the after deck. 



Plate 7. The Tanner sounding machine complete, with metal and 

 wooden cases for the Negretti and Zainbra deep-sea thermometer 

 attached ; side view. Underneath the machine are a coil each of 

 sounding wire, hand line, and deep-sea lead line, to show compar- 

 ative sizes. 



Plate 8. The same, front view, in x>osition for heaving in. 



Plate 9. The same, front view, in position for sounding, with the 

 Bassnet atmospheric lead. 



Plate 10. The accumulator, Sigsbee's pattern; dredging block, and 

 safety hooks. 



Plate 11. The safety hooks. 



Plate 12. The Negretti and Zambra thermometer; wooden case for 

 same supplied by the makers; original metal case for same, with 

 accessories, designed by Lieut. Z. L. Tanner, United States Navy. 



Plate 13. Hilgard's ocean salinometer. 



Plate 14. The wardroom of the Fish Hawk. 



Steamer Blake, 350 tons measurement, built expressly for sounding and 

 dredging purposes. Eepresented by photographic plates and plans. 



United States Coast and Geodetic Survey. 



"The United States Coast Survey steamer Blake was built for the 

 special work on which she is employed. She is a screw steamer, of 350 

 tons O. M., 150 feet long on the load line, 26£ feet breadth of beam, and 

 has a deep draught of 11 feet. Her engine is compound, of about 70 

 nominal and 270 actual horse-power, and her bunkers will hold sufficient 

 coal for thirty-eight days' steaming. The rig is that of a fore-and-aft 

 schooner. Aft on the main deck are spacious and well- ventilated quarters 

 for the officers. Forward of the wardroom, on the same deck, is a contin- 

 uous line of midship houses, reaching nearly to the foremast, and form- 

 ing the engine-room, boiler-room, galley, pantry, draughting room, lamp- 

 room, and mechanics' sleeping room. The arrangement of the main- 

 deck houses leaves, on either side, a wide gangway, ventilated and 

 lighted along its whole length through large square ports, which can 



