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Log

Page	Plate	Class	Object	R.A.	Dec	Start	Obs H.A.	Obs Dec	Stop	Exp	Date	Miscellaneous
18	321	T1		17 00	+15.0	19 27 50		+15.0	19 37 50		Sep 15 1908	Examined mirrors by holding small 45 degree prism so as to compare light of sky reflected by prism with light reflected by both mirrors. The light for mirrors was red dust color due to tarnish of surface of the primary mirror. The light intensity was very unequal. The prism was then held & compare light reflection by prism for primary mirror with light reflected by secondary mirror from same source. There was a slight difference in intensity but it was not marked. The prism reflected more light than secondary mirror. Apparatus with ridge will be prepared to make numbered readings. x321 HA 2 26W at 19 25 45 H 321 HA E or W? Please enter in Book. Reading of focus at 19 12 0.7+0.7+0.7= mean .07 temp at 53.
18			Pole			19 43 58		+90.0	19 53 58		Sep 15 1908
18	322	L	Pole			19 54 17			20 04 17		Sep 15 1908	x 322 Test of mirrors. The primary mirror is in bad condition having the surface much tarnished. Reading of Focus at 20 10. Temp = +49. 0.65+ 0.7+ 0.75 = Mean =0.7. 4 10 S.T. set on θ Aurigae. Focus 1.2 +1.3+ 1.3+ 1.3. Temp = 42. H 322 HA ? Plate enter in Book. All plates on the Pole with this instrument are taken at about 1h E when the circle is west. K. Ready focus at 19 12.