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Log
| Page | Plate | Class | Object | R.A. | Dec | Start | Obs H.A. | Obs Dec | Stop | Exp | Date | Miscellaneous |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 166 | Feb 07 1900 | On face of Camera Back fixed mm scale graduated to millimeters. Made index of needle point fastened rigidly to building by frame work. In this manner measured depression of tube when weights were hung over at tail piece. Scale Reading. No weight 35.1mm. Spring Balance & Weight indicated at 6 lb. 35.7mm 12.6 lb 36.2 19.5 lb 36.5 #13.5 lb in 0.8mm. Scale &c readjusted. Weight 19.5 39.0mm Weight 16.2 38.9 Weight 13.0 38.8 Weight 9.5 38.7 19.5 lb 0.8 Weight 6.2 38.5 Weight 3.0 38.3 33 lb 1.6 0.0 38.2 Effect of 1b = 0.05 at tailpiece. Plate holder & small weight represented diff of balance making tailpiece heavy by about 2 lb. From above contact of battery would be 2 x 0.05mm = 0.10mm. |
