728 FISHERIES OF THE UNITED STATES. [84] 



Parallel rules — Continued. 



from the links, by throwing back the movable blade until it 

 rests upon the hand which holds the fixed blade." 



Lever-clock. 



U. S. Fish Commission. 39,388. Used on fishing vessels. 



Quadrant. 



Old style quadrant ; large size, such as were in use 50 to 75 years 

 ago. Gloucester, Mass., 1882. 54,332. A. E. Crittenden, 

 Middletown, Conn. 



Quadrant. 



U. S. Fish Commission. 39,391. Used for obtaining altitudes of 

 the sun, moon, or stars, from which the position of a vessel can 

 be determined when at sea. 



Spy- glass. 



Common telescope form. U. S. Fish Commission. 39,390. This is 

 the style of spy-glass in most common use on fishing vessels. 



HOLOSTERIC BAROMETER. 



U. S. Fish Commission. 39,386. Carried on nearly all of the first- 

 class fishing vessels. 



35. Books. 



Nautical Almanac for 1880. 



U. S. Fish Commission. 39,389. Used on fishing vessels in ascer- 

 taining their position at sea. 



Bowditch's American Practical Navigator. 



Published by United States Bureau of Navigation. U. S. Fish 

 Commission. 39,390. Used in navigating fishing vessels. 



Coast Pilot. 



Divisions A, B, and 14 of the Atlantic Coast Pilot. United States 

 Coast and Geodetic Survey, J. E. Hilgard, Superintendent. 



Nautical Almanac. 



American Ephemeris and Nautical Almanac. United States De- 

 partment of the Navy ; Bureau of Navigation, Nautical Alma- 

 nac Office. 



36. Charts used by fishermen. 



Eldridge's Charts, and Coast Pilot. 



Exhibit of Eldridge's Charts and Coast Pilot, published by S. Thax- 

 ter & Son, Boston, Mass. "As a rule, the fishermen prefer to 



