168 U. S. COAST AND GEODETIC SURVEY. 



differences occur on solar hours 3 and 17 of the 22d day. It will be 

 noted that the hour 3 is marked by an asterisk. Applying the 

 differences from the table as indicated, we have for the 22d day 

 of series: 



Solar hours.. 0, 1, 2, 3*, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16*, 17, 18 

 Diflerences.+14,+14,+14,4-15, +15,+15,+15,+15,+15, -9, -9, -9, -9, -9, -9, -9, -9, -8, -8 



Component 



GO hours. 14, 15, 16, 18, 19, 20, 21, 22, 23, 0, 1, 2, 3, 4, 5, 6, 7, 9, 10 



In the results it will be noted that component hours 17 and 8 are 

 missing. If it is desired to have each of these hours represented also, 

 the solar hours marked by asterisks will be used again. In this table 

 the components have been arranged in accordance with the length of 

 the component days. 



Table 32. — Divisors for primary stencil sutjis. — This table contains 

 the number of solar hourly heights included in each component hour 

 group for each of the standard length of series when all the hourly 

 heights have been used in the summation. 



Table 33. For construction of secondary stencils. — Component A 

 is the component for which the original primary summations have 

 been made, and component B is the component for which the sums 

 are to be derived by the secondary stencils. The '^Page" refers to 

 the page of the original tabulations of the hourly heights in Form 

 362. The differences in this table were calculated by formula (273), 

 and the corresponding ''Component A hours" from formula (271), 

 m being assigned successive values from 1 to 24 for each page of 

 record. Special allowance was made for page 53 of the record to 

 take account of the fact that in a 369-day series this page mcludes 

 only 5 days of record. The sign of the difference is given at the top 

 of the column. For K-P and R-T the positive sign is to be used for 

 components K and E, and the negative sign for components P and T. 



For brevity all the 24 component hours for every page of record 

 are not directly represented in the table. The difference for the 

 omitted hours for any page should be taken numerically one greater 

 than the difference for the given hours on that page. For an exam- 

 ple, take the hours for page 2 for component 00 as derived from 

 component J. According to the table the difference for the compo- 

 nent hours 10 to 3, inclusive, is 9 hours; therefore the difference for 

 the omitted hours 4 to 9, inclusive, should be taken as 10 hours. For 

 component 2Q as derived from component O the three differences 

 usually required for each page are given in full. 



The use of the table may be illustrated from the example above, as 

 follows : 



Page 2— 



Component J 



hours-^ 0, 1, 2, 3, 4, 5 6, 7, 8, 9, 10, 11 



Differences... +9, 9, 9, 9, 10, 10, 10, 10, 10, 10, 9, 9 



Compo nent 



OOhours... 9, 10, 11, 12, 14, 15, 16, 17, 18, 19, 19, 20 

 Component J 



hours 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 



Difference +9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9 



Compo nent 



OOhours... 21, 22, 23, 0, 1, 2, 3, 4, 5, 6, 7, 8 



