Useful Navigation for Power, Steam and Sailboat Yachtsmen - Christopher Sickler Street, Paperback

• Release Date   9/13/2013
• ISBN-13   9781230109121 | 978-1-230-10912-1
• ISBN   1230109129 | 1-230-10912-9
• Format   Paperback
• Author(s)   Christopher Sickler Street
• This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1917 edition. Excerpt: ...Latitude, Cosecant of the Polar Distance, Cosine of _ These logs. are then added and divided by two. Get the Sine of this sum (after dividing by 2) from the tables for the Hour Angle. This is taken from Table 44 Bowditch in the P. M. Column if P. M. at ship or in the A. M. Column if A. M. at ship. This is the Correct Apparent Time at Ship, at instant the sight was taken. To know the Long. at this same instant, we must apply the Local Apparent Time with the Greenwich Apparent Time. If the G. A. is greater than the ship time, the difference will be the Long. West, after the hours, minutes and seconds have been turned into Arc. After the first sight was taken a RUN was made and another sight taken. The Run is E. X. N. 36 N. 39 miles. Then the Obs. Alt. was 10 53' 30" S. Chronometer Time is Feb. 3d, 3 hrs. 37 m. 11 s. P. M. at ship, remember now, H. E. 20 ft. Corrected Eq. T. is 13 m. 59 s. minus. Dec. corrected is 16 33' 12" S. Use the same assumed Lats. as in other problem and give tw_o_Longitudes to show another Line of Position. Set off the Run from First Line of Position and show crossing of the Lines for location of the ship at second sight. Ans. Lat. 48 10' N. gave Long. 0 5' 15" E. and Lat. 48 40' N. gave Long. 0 34' 15" W. The crossing of the lines show location of the ship Lat. 48 14' N. Long. 0 1' 0" E. The New Sumner Chart is made in par! form so that plotting of the Position Linea may be done quickly and with accuracy. The Latitude and Longi-tude Lines are left blank so that any Let. and Loni. my he set in for the poaition by D. R. The eompul in set true so that the Azimuth Linen may he let off that way. This form in about one-fourth the size of the worhinfl...