Nain Singh Surveys Tibet

In 1865, Nain Singh, a schoolteacher from the Kumaon region of the Himalayas, set out on one of the most remarkable feats of covert geography in the nineteenth century. Traveling in the guise of a Buddhist pilgrim and trader, he crossed Tibet to Lhasa while secretly measuring the distance he covered, step by step. His work gave the British a first reliable fix on the location and altitude of the Tibetan capital, and it showed that trained local agents could map lands closed to Europeans.

The background lay in British India's ambitions and anxieties. The Great Trigonometrical Survey had mapped much of the subcontinent with enormous precision, but Tibet, ruled under the Qing empire and wary of outsiders, barred foreign travelers. British officials wanted to know what lay beyond the Himalayas, partly out of scientific curiosity and partly because of strategic rivalry with Russia and China. Thomas Montgomerie, a Royal Engineers officer with the survey, proposed training South Asians from Himalayan border communities, who could pass more easily among Tibetans. These men became known as the pundits, and Nain Singh was among the first. He and his cousin Mani Singh were trained at Dehradun.

The training was ingenious. Nain Singh learned to take a stride of consistent length, so that 2,000 paces equaled a mile, and he kept count using a rosary of 100 beads instead of the traditional 108, with every bead representing 100 paces. He hid his notes in a prayer wheel, where scrolls of survey data replaced the usual written prayers, and he concealed instruments in his luggage. He also used boiling-water thermometers to estimate altitude and made celestial observations to fix latitude. Disguise mattered as much as technique, since discovery could have meant severe punishment.

Nain Singh entered Tibet from Nepal and reached Lhasa in early 1866, according to most accounts, after months on the road. He remained there for some weeks, taking observations of the city's position and elevation, and he met the Dalai Lama. His readings placed Lhasa much more accurately than earlier estimates had done. On the return journey he followed the great Tsangpo river for a stretch, adding to what outsiders knew of its course.

The legacy was considerable. Nain Singh later undertook longer expeditions, including one to the gold fields of Thok Jalung in western Tibet, and the Royal Geographical Society honored him with a gold medal in 1877. The pundit system continued for decades and filled in large blanks on the map of Central Asia. Yet the pundits were underpaid and little remembered for years, and their story is now often told as a reminder of how much imperial knowledge depended on the skill and risk-taking of indigenous explorers.