'Telegraphic determinations of the difference of longitude
between Karachi, Avanashi, Roorkee, Pondicherry, Colombo, Jaffina,
Muddapur and Singapore, and the government observatory, Madras'
'Telegraphic determinations of the difference of longitude
between Karachi, Avanashi, Roorkee, Pondicherry, Colombo, Jaffina,
Muddapur and Singapore, and the government observatory, Madras'