Measurement by Brigade Major William Lambton of the meridional arc from Puchapollian to Paughur and of the arc perpendicular to the meridian.

1. Measurements of an arc extending from latitude 10º59'50".14 to 13º59'51".62 and the measurement of an arc perpendicular to the meridian in latitude 12º55'10".24.

i. The meridional arc.

ii. Experiments made for comparing the chains previous to the experiment.

iii. Tables containing the particulars of measurements.

iv. Angles.

v. Principal triangles from which the meridional arc is derived.

vi. Measurement of the base line in the Coimbetoor.

vii. Details of the measurements.

viii. Observations and tests with the triangles.

ix. Pole Star observations at Dodagoontah.

x. Reduction of the distances to the meridians of Dodagoontah and the lengths of the terrestrial arcs.

2. Zenith distances of the stars, with the correction for precession, nutation, aberration and the semi-annual solar equations, the observations undertaken at Paughur, Dodagoontah, Puchapollian and Bomasundrum.

3. Means of the zenith distances taken on the right and left arcs at Paughur, Dodagoontah, Puchapollian and Bomasundrum corrected for refraction. There are also equations of the sectorial tube, notes on the micrometer, the latitude of Dodagoontah Station, the amplitudes of the arcs and the celestial arc between the parallel.

4. Material chiefly on the perpendicular arcs, comprising angles, principal triangles from which the perpendicular arcs are derived, the latitude of Savendroog Station, the arc comprehended by the meridians of Savendroog and Mullapunnabetta, and the arc comprehended by the meridians of Savendroog and Yerracondah, with a plan of the meridians used.