These globally linked meteorological phenomena are termed teleconnections and Todd was one of the first to recognise their effect. One of Todd's legacies is the 63-volume Weather Folio collection covering the period 1879–1909. These volumes have been digitally imaged by volunteers of the Australian Meteorological Society in conjunction with the South Australian Regional Office of the Australian Bureau of Meteorology. Atmospheric pressure data from these journals has been digitised and sent to the NOAA for inclusion in the International Surface Pressure Databank as part of the ACRE project. Government Electrician Charles Todd had many responsibilities, but during his lifetime he referred to himself as "Government Electrician". He promoted the use of electric light in the colony by giving demonstrations of the electric arc lamp, the first in 1860. In 1867 he demonstrated the arc lamp in King William St, lighting up from the Town Hall to North Terrace (about 500m). He was instrumental in having electric lighting installed at the 1887 Adelaide Jubilee International Exhibition, the first in Australia to do so. Also in 1887, the South Australian Electrical Society was established with Charles Todd as president. He was influential in setting up the first electrical engineering course in SA. Todd was appointed to a commission to add electric lighting to Parliament House in 1890; he supervised the installation the following year. Two years later the GPO finally had electric light. In 1899 Todd, with his son-in-law William Henry Bragg, demonstrated a wireless system that could be used over a distance of 4 km; but at this time was too expensive to be put into practice. Finally, Todd was responsible for drawing up the draft document which would regulate electricity supply in the newly federated Australian states. Astronomical work Though so much of his time was taken up by the duties of the postal department, Todd did not neglect his work as government astronomer. Using the Adelaide Observatory (completed in 1860), which was thoroughly equipped with astronomical and meteorological instruments, he contributed valuable observations to the scientific world on the transits of Venus in 1874 and 1882, the cloudy haze over Jupiter in 1876, the parallax of Mars in 1878, and on other occasions. He selected the site of the new observatory for Perth in 1895 and advised on the building and instruments to be obtained. He was the author of numerous papers on scientific subjects, many of which were