142 FISHERIES OF THE UNITED STATES. 



II. PREPARATION OF OILS AND GELATINES. 



7. Extraction of whaxe-oil. 



INSTRUMENTS AND APPLIANCES OF RENDERING WHALE- 

 OIL. 



Oil painting;, by J. S. Ryder, Boston, Mass., "Cutting up a Finback 



Whale in Piovincetown, Harbor." U. S. Fish Commission. 

 Try-pots. 



25013. Model of whaler's try-works. Capt. L. W. Rowland, New Bedford, 

 Mass. 

 This model is accompanied by miniature models of all the implements 

 used in trying out the blubber, viz : 



a. Fire-pike. 



b. Stirring-pole. 



c. Scrap-hopper. 



d. Skimmer. 



e. Bailer. 

 /. Cooler. 



g. Deck-pot. 

 h. Casks. 



8. EXTEACTION OF FISH-OILS. 



26899. Model of menhaden oil factory. Owned by Joseph Church & Co. 

 Joseph Lawler, Bristol, Me. 

 The factory is the most elaborate of the sixty or more on the coast of 

 New England and the Middle States, and is 160 feet in length by 40 in 

 width. 



39431. Photographs of A. W. Dodds' Oil Works for trying out oil of halibut, 

 Gloucester. Capt. J. W. Collins. 



III. MANUFACTURE OF FERTILIZERS. 



9. Preparation of guano. 



MODEL OF FISH-GUANO WORKS. 

 Mixers. 



25822. Model of guano-mixer. Patented April 27, 1-^67. Poole & Hunt, Bal- 

 timore, Md. 

 This mixer is employed in the fish-guano works for the iDurpose of 

 thoroughly mixing the fish-scrap with the mineral phosphates and sul- 

 phuric acid. 



Guano in its various stages, with its ingredients, South Carolina phos- 

 phates, Navassa phosphates, scrap (crude and dried), suli^huric acid, 

 kainite, screened and unscreened guano, and seaweed used in prepara- 

 tion : a full series of these is exhibited in the case of Guanos. 



