Directions for Using the Solar Attachment 



Prepare a table of declination values, corrected for refraction, 

 for the day of observation, showing the settings for each hour as 

 directed in the pages preceeding and in the insert appendix in the 

 back of this publication. 



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The procedure described in the examples given should be 

 carefully followed. The hourly change in declination is never 

 quite one minute of arc, so that a setting prepared for 3 p. m., 

 for instance, will be good between 2:45 and 3:15 o'clock. 



1st step. Bring the sight line of the solar to revolve in the 

 same vertical plane with the main telescope by sighting both at 

 some distant point. Incline the transit telescope until the amount 



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