1216 FISHERIES OF THE UNIT; D STATES [62] 



Pabkek's rotating hatcher — Continued. 



width, 4 inches. Invented Iiy Joel C. Parker, Grand Bapids, 

 Mich. 39,470. Presented by Joel C. Parker. The motion is 

 communicated to the windlass, and thence through the clock- 

 work to the hatching cylinder, by means of a weight which is 

 suspended from the end of the windlass rope. The weight is 

 raised by means of a crank attached to the windlass, and the 

 distance through which it falls is considerably shortened by 

 the use of compound pulleys. 



FERGUSON'S SUBMERGED PLUNGING BUCKET. 



A cylindrical brass frame, the top and sides of which are covered 

 with nickel-plated wire cloth of fine mesh. The top is mov- 

 able, being fastened by bolts and thumb-screws. Diameter, 

 14 inches; length, 20 inches. Invented by T. B. Ferguson, 

 in 1880. 57,156. TJ. S. Fish Commission. This bucket is 

 suspended from the end of a lever, which is worked by ma- 

 chinery. It is submerged to the depth of several feet, a ver- 

 tical motion being imparted by the lever to facilitate the change 

 of water. It has been used for hatching both heavy and float- 

 ing eggs. 



Ferguson's plunging bucket. 



A cylinder of block-tin, with a movable wire cloth bottom; 24 

 inches long and 18£ inches in diameter. Invented by T. B. 

 Ferguson, in 1877. U. S. Fish Commission. This bucket is 

 suspended from the end of a lever so that the lower half or 

 two-thirds is submerged. The motion of the lever is so ad- 

 justed as to give a quick drop and slow rise, the upward and 

 downward movement being about 6 inches. A bucket as 

 above described will hold 200,000 shad-eggs. 



u Hanger," " cam," and " guides." 



For Ferguson's improvement in fish-hatching apparatus. In use 

 on the U. S. steamer Fish Hawk for imparting a vertical motion 

 to the hatching cans. Designed by T. B. Ferguson. 39,107. 

 TJ. S. Fish Commission. 



APPARATUS FOR ADHESIVE EGGS. 

 ElCARDO'S SMELT-HATCHING BOX. 



A rectangular box, with a hinge-cover and perforated ends, covered 

 with wire cloth. The inside of the box is filled with twigs, to 

 which the adhesive eggs of the smelt are attached. Devised 

 by George Bicardo, Hackensack, N. J. 39,102. TJ. S. Fish 

 Commission. This box is placed in the river where the current 



