From December, 1881, when the first Chinese telegraph line was opened (that from Shanghai to Tientsin), till the spring of 1883, he was one of eight operatives and engineers lent by the Company to the Chinese Government.

In December 1883, having returned in the meantime to the Great Northern he accepted an engagement under the Imperial Government and he has been in their employ ever since.
During this time he has superintended the construction of 7000 li (2350 miles) of telegraph lines, and it was he who, on the 20th May, 1890, effected the junction of the Chinese system with the French lines at Laokai.

Among the more important lines constructed by him are those joining the two capital cities of the provinces of Yunnan and Kweichow; that from Yunnan City to Mungtze, on the frontier of Tonquin; that from Canton to the boundary of Fuhkien province; and that from Yunnan City through Tali to Tengyueh (Momien), this last line being the one which will eventually unite with the marvellous Indian telegraph system at the Burmese frontier.

In the course of his many journeys through China, Mr.
Jensen has been invariably well treated by the Chinese, and it is pleasant to hear one who has seen so much of the inner life of the country speak as he does of the universal courtesy and hospitality, attention, and kindness that has been shown him by all classes of Chinese from the highest officials to the humblest coolies.
[Illustration: VIEW IN YUNNAN CITY.] Many interesting episodes have marked his stay in China.

Once, when repairing the line from Pase, in Kwangsi, to Mungtze, during the rainy season of 1889, fifty-six out of sixty men employed by him died of what there can be little doubt was the same plague that has lately devastated Hong Kong.