itself to r.ll parts of the lobster os t/ell as to the larvaee In 

 the course of the vears follov/lnf; no improvement in the results 

 v;as madee The apparatus v;r.s constructed and durint; the first 

 years also inancged by Svmd, later by A« Dannevig, the manager of 

 the -vTell knovm seafish station at PlBdevigen. After the season 

 of 1918 the plant was disassembled for lack of results. 2j 



2/ In the annual report of Ilorvre^ian fisheries, 1919 - 1920a : 

 appears a notice by Dannevig to the efl'ect that the exper- 

 inents halted after 1918 vrere resuioed vith c?ianged iiethods 

 and on a siiiD.ller scale* In this case a cylinder -.'/as used 

 Tfith a double bottom. The upper one consisting of perfor- 

 ated cellulcido A stream of ivater vra.s entered at the 

 bottom, passed through the celluloid and out of the cylin- 

 der tlirough a screen at the top» To create a whirling 

 strerjn a hose v/as inserted and made to eject v.'ater along- 

 side the vv-all but the stream coming up through the celluloid 

 bottom prevented the forming of v/hirl in the middle of the 

 cylinder© The result was that si:: per cent of the larvae 

 could be grov;n to the fourth stage v/hile a niimber of younger 

 larvae vrere provided for planting or for experiments. In 

 the event this method should be continued it should be 

 v/atched and if finally the results becnr.iC favorable a 

 decision shall }iav3 to be made as to vhether the Ajierican 

 or the Ncrvregian system offers m.cst chances for successful 

 propagations* 



Conditions were about as described when in 1918 the Fisheries 

 inspection service jicved to tackle the probleme The good shav;ing 

 made in America with an apparatus r/hich w.s the result of lengthy 

 experiments mr.de it seem desirable to comi.ience in 1913 with an 

 assembly based on the same principles* ]Jecause of the then ;^;reat 

 e::pense and scarcity of required materials and the proportionately 

 slin funds allotted vre were forced to limit oursel'"-es carefully 

 during construction and mxinaged to bring our plant to completion 

 by housing everybhing on one rafb and by building only tvro rear- 

 ing tanJcs* 



Construction and arrangement !\re best understood by a study 

 of figures 6, 7 and 8 sharping section, elevation and plan of the 

 original assemblye In the center, (plot plan) one sees the 

 irr>chine sliop in which the motors are housed as well as a number 

 of pulleys for the purp-^se of speed ad;]ust;-ent » The shaft which 

 e:d;e".ds fr ^m the shop normally turns at about 25 RPM while the 

 motors a^re -^f from 400 to 700<. The shop also curtains a table 

 v;hich may support aquarium basins for. the service of which a pump 

 is provided v:ith a capacity of 1000 liters per houTo 



128 



