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Log

Page	Plate	Class	Object	R.A.	Dec	Start	Obs H.A.	Obs Dec	Stop	Exp	Date	Miscellaneous
22											Sep 01 1908	Apparatus for testing mirrors. Comparison with full contamination. Readings made with Blue Shade. 18.3 18.4 19.3 18.4 19.0 134 / 5 = Mean = 18.7. [[image of blue shade, wedge, secondary mirror]]. Affirmation & position for testing with mirror. Primary mirror.
22											Sep 01 1908	Readings made without Blue Shade. 18.2 18.5 18.4 18.3 17.3 = Mean = 18.1. The face of the prism is turned toward its primary mirror. When it is twisted to test the secondary mirror. Wedge 7741 #2 is used. When light edge of wedge (i.e. the end of the glass) is over center of opening the reading is 25.1. Confirm to test secondary mirror gave difference too small to be measured by wedge.