MARINE FISH HATCHERY AT FLODEVIG, NORWAY. 



807 



long, 2 feet 3 inches broad, and 1 1 inches deep inside. By a partition board 

 in the middle it is divided lengthwise in two compartments. These are again 

 divided crosswise in 7 compartments each, the first and last pair being 4 and 

 the others 15 inches long. They are all watertight with the exception that the 

 smaller ones communicate with each other through an aperture in the center- 

 board B. 



In the top of each of the transverse boards 

 is a depression i inch deep and 3 inches wide, into 

 which is fixed a brass spout (fig. 8). 



The egg box, or incubator, shown in figure 7 , 

 is 12^2 inches long, 11 J2 inches wide, and 10 j4 

 inches deep, and made of five-eighths inch white 

 pine. The bottom is covered with silk gauze. 

 It has, similar to the partition board, a depres- 

 sion in the upper edge, also fitted with a brass 

 spout, just large enough to pass outside the for- 

 mer. The incubator is hinged to the transverse 

 board as shown in figure 8. 



When the apparatus has been placed in posi- 

 tion — slanting 3^2 inches — and the water turned on, the small compartments 

 become filled, after which the water passes through the spouts into the next 

 compartments, and so on until the whole of the apparatus is full and the super- 

 fluous water escapes through the drain F. 



As the incubators are made of light wood the loose end will float up and 

 have a position as shown at H, figure 6. The circulation of the water after the 



Fig. 7. — Egg box. or incubator. 



KiG. 8. — Mode of fastening incubator. 



apparatus is set going is shown by arrows. As the current is regular, eddies will 

 be formed and the eggs be crowded together in the dead corners, where a great 

 many would die from suffocation. To avoid this an up-and-down movement of 

 the loose end of the incubators has been contrived in the following manner: 



An iron rod (M), a couple of inches shorter than the apparatus, is joined to 

 this at the upper end and passes down the center between the series of boxes. 



