Google has an old book online (full view - 14.7 mbs) entitled ''Historical and descriptive account of British India'' by Hugh Murray and others. Published in New York 1832 in three volumes. http://books.google.com/books?id=pdI2AAAAMAAJ&printsec=titlepage&dq=monsoon+british+india&source=gbs_toc_s&cad=1 The third volume has an entire chapter on Col. Lambton's Trignometrical Survey of India. http://books.google.com/books?id=pdI2AAAAMAAJ&pg=PA183&lpg=PA183&dq=monsoon+british+india&source=web&ots=Y-Rr4it8Z0&sig=UXAUJ3Rq0MHBIyudDjXxI777PsM&hl=en&sa=X&oi=book_result&resnum=41&ct=result#PPA316,M1 --- Harshawardhan_Bosham Nimkhedkar Nagpur, India