Taylor and Wells. — Preservation of Nets and Lines. 39 



details, see Taylor, 1921). The copper was omitted from the formula 

 so as to get a check on the value of copper in connection with tanning 

 extract. 

 L. Dutch method. The lines were steeped twice with hot extract of quer- 

 citron, drying each time as in the foregoing, and mordanted with an 

 ammoniacal solution of copper sulphate, containing 1 per cent 

 copper sulphate and 3 per cent of a 28 per cent solution of ammonia. 

 (See Olie, J., Jaarverslag van het Visscherij-Proef station over 1917, 

 subtitle, Voorschriften voor de behandeling van netten met kopersulfaat 

 en ammonia, p. 40-42, 1917.) 



Copper Oleate: 



B. Copper oleate approximately 7 per cent solution in gasoline. The lines 



so treated contained about 8 mg. copper per yard. 



C. Copper oleate. About 7 per cent copper oleate solution in gasoline, 5 



per cent mineral oil, to prevent the copper oleate from "creeping" to 

 the surface, and cresol, 1 to 1,000. The line so treated contained about 

 8 mg. copper per yard. 



D. Copper oleate, approximately 11 per cent solution in gasoline. The line 

 so treated contained about 11 mg. copper per yard. 



E. Copper oleate, approximately 11 per cent solution and 2 per cent 



mineral oil, in gasoline. 



M. Copper oleate, a solution of about 7.5 per cent copper oleate in gasoline. 

 Line contained 8 mg. copper per yard. 



N. Copper oleate, approximately 12.5 per cent solution in gasoline, with 5 

 per cent mineral oil and 1-1,000 cresol. The line contained 12 mg. copper 

 per yard. 



O. Copper oleate, approximately 12.5 per cent in gasoline. The line con- 

 tained 18 mg. copper per yard. 



P. Copper oleate, approximately 12.5 per cent in gasoline, and 2 per cent 

 mineral oil. The line contained 18 mg. copper per yard. 

 3. Proprietary preservatives. 



J. Petroleum Product No. 1, a preparation made by a petroleum product 

 company. Original formula. Dark, brownish black liquid, thinner than 

 the coal tar. Lines dipped and dried. 



X. Petroleum Product No. 2, similar to J, but a later formula supplanting 

 Petroleum Product No. 1. In appearance similar to J. Line dipped 

 and dried. 



K. Waterproofing material, a preparation made by a manufacturer of water- 

 proofing materials. 



Q. Copper paint No. 1, a coppery colored paint, similar to that used to 

 protect the bottoms of ships. It was diluted with an equal volume of 

 creosote oil (according to directions), and the lines were dipped in it 

 and dried. The treated lines contained 60 mg. copper per yard. 



R. Copper paint No. 2, similar in appearance to the foregoing. The treated 

 lines contained 270 per cent mg. copper per yard. 



S. Gilsonite or Uintaite, a mineral asphaltic or bituminous substance put 

 up by a varnish company. A thick, black, tarry substance. 



