Since my paper with the above title was read, it has occurred to me that some particulars as to the weight of the instrument might interest those engaged practically in Geodesical work. The following are the weights of the main parts as separated for carriage:— (1)
Stand
, with Levelling-apparatus complete ..... 108 (2)
Iron Circle of Stand
with 3 Centering-Screws ... 156 (3)
Tribrach
, with Horizontal Circle, Guard ditto, Vertical Axis, and Relieving-apparatus ....... 180 (4)
Vertical-Axis Socket
, with 5 Horizontal-Microscope arms, Elliptical Table, Pillars, 2 Azimuthal Levels, 2 Vertical ditto, 2 Vertical Microscopes, 2 Pointer ditto, Horizontal Tangent-Screw plates ........ 235 (5)
Telescope
, with Vertical Circle ........... 64 (6) Miscellaneous appliances and spare parts (about) ........ 130 Weight of Instrument ............................................ 873 (7) Aggregate weight of field packing-cases, assumed at 2/3 the weight of contents ... 582 Total weight of Instrument in field-cases ...................... 1455