Perception of Contrasts When the Contours of Details Are Blurred
نویسنده
چکیده
S OF RECENT SCIENTIFIC PUBLICATIONS OF THE N.V. PHll..IPS' GLOEU,AMPENF ABRIEKEN Reprints of these papers not marked with an asterisk can be obtained free of charge upon application to the Administration of the Research Laboratory, Kastanjelaan, Eindhoven, Netherlands. 1880:' J. ter Berg and G. J. van Wijnen: The porosity of welds (Welding J. 28, 269 S-271 S, 1949, No. ,6). A study of external porosity in welds, as caused by sulphur. By relatively slight alterations in the composition of the coating it is possihle to ohtain welds free from this porosity, even with a considerahle sulphur content of core wire and coating. Two methods were applied: 1) Tli'e coating was made more hasic in order , to 'ahsorh 'more S in the slag. 2) The oxidizing p&wer of the coating was increased in 'order to get rid of sulphur in the
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