The following method is suggested, using Martelli’s tables, for calculating the altitude from the dead-reckoning position. These tables are so well known for calculating the L.H.A., they need no introduction, and by using this short method for calculating the altitude, they offer one of the most complete tables in use today.
It will be seen by the following example that this method is short, simple, and accurate.
On the morning of August 12, 1932, observed sun’s lower limb, in D. R. Lat. 42°-46' N., D. R. Long. 70°-03' W., obs. Alt. 55°-06', Dec. 14°-56' N., Eq. T. —4'-54", Chro. T. 15h-llm-18s. Chro. fast 2m 43s, H.E. Cor. 11'.6.
When the latitude and declination are opposite named, the latitude and declination are added and the sum is taken to Table II, the other functions remain the same as shown.
Left stack 211
Long Beach breakwater 235
These angles are quickly drawn on a small section cut form an old chart as shown in Fig. 1.