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Log

Page	Plate	Class	Object	R.A.	Dec	Start	Obs H.A.	Obs Dec	Stop	Exp	Date	Miscellaneous
66											Sep 03 1912	Primary mirror has been silvered. Coat thick so that electric filament cannot be seen change it. Measure of absorption. 1 Blue Shade. 21.3, 22.3, 21.9, 22.4, 22.1 = 110 / 5 = 22.0. 2 Blue Shades. 21.4, 22.1, 21.9, 22.6, 22.7 = 57 / 5 = 22.1. Mean of all 22.1. It was difficult to make settings as the thinnest part of the wedge fully compensated for the total absorption.