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THE SIGSBEE MACHINE FOR SOUNDING WITH WIRE; PATTERN OF 1881. 



During the year 1881 a Sigsbee Sounding-Machine was made for each 

 of the following-named organizations: U. S. Navy, U. S. Coast and Geodetic 

 Survey, and Imperial German Navy. Another is now being made for the 

 U. S. Commission of Fish and Fisheries. The leading object in this sup- 

 plement is to point out such improvements in these machines as are not 

 embraced in the machine shown on Plate 8, &c, of the original volume to 

 which the supplement pertains. 



The references herein relate to the original volume. In the views 

 shown on the two accompanying Plates the scale of dimensions is the 

 same throughout the set. 



In the construction of the new machines metal only has been em- 

 ployed, a cast-steel bed, in two parts, replacing the wooden bed formerly 

 used. The new style of bed allows the machine to be more compactly 

 folded than before. 1 The strain-pulley has been abandoned and its former 

 place on the bed is now occupied by the steam-engine and a special 

 form of tightening-pulley. 2 An auxiliary brake has been placed beneath 

 the reel; a single spur buffer only is used at the foot of the guide-pipes, 

 and the outriggers to which the side stays are set up, and the casting 

 which supports the fairleader and swivel pulley, are now hinged or 

 pivoted. 3 The intention is to adapt the machine for folding with the 

 removal of so few parts that, in inexperienced hands, there need be no 

 doubt as to the position which each part should occupy when the machine 

 is set up for use. Steel castings are used wherever they can be utilized. 



1 Corop. Plate 12. 2 Page 62, If 4, and p. 72, If 1. 'Page 64, IT If 7 and 8. 



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