[132] Bertrand and Reinach, Les Celtes et les Gaulois dans les Vallées du Pô et du Danube, p. 82. Tregellis, “Stone Circles in Cornwall.” Trans. Penzance Natural History and Antiquarian Society, 1893-4.
APPENDICES
I. Details of the Theodolite Observations at Stonehenge
The instrument chiefly employed was a six-inch transit theodolite by Cooke with verniers reading to 20″ in altitude and azimuth. Most of the observations were made at two points very near the axis, which may be designated by a, b. Station a was at a distance of 61 feet to the south-west of the centre of the temple, and b 364 feet to the north-east. The distance from the centre of Stonehenge to Salisbury Spire being 41,981 feet, the calculated corrections for parallax at the points of observation with reference to Salisbury Spire are:—
| Station | a | + | 4 | ′ | 12 | ″. |
| „ | b | - | 25 | ′ | 20 | ″. |
(1) Relative Azimuths.—Theodolite at station a—
| Salisbury Spire | 0 | ° | 0 | ′ | 0 | ″ |
| N. side of opening in N.E. trilithon of the external ring | 237 | 27 | 40 | |||
| Tree in middle of clump on Sidbury Hill | 237 | 40 | 20 | |||
| Highest point of Friar’s Heel | 239 | 47 | 25 | |||
| S. side of opening in N.E. trilithon | 240 | 14 | 40 | |||
| Middle of opening in N.E. trilithon | 238 | 51 | 10 |
(2) Absolute Azimuths.—All the azimuths were referred to that of Salisbury Spire, the azimuth of which was determined by observations of the Sun and Polaris.
(a) Observation of Sun, June 23, 1901, 3.30-3.40 P.M.