According to Readers Guide to The Mahatma Letters to A. P. Sinnett:
Beatson, Mr., a young officer of the Bengal Cavalry. He was at Simla, India in October 1880 at the time of the visit of the Founders, when so many phenomena where produced through HPB. He joined the TS at that time. he is said to have missed out on advancement in the army due to favoritism. Became much interested in occultism. LBS, p. 27.
He was present at the dinner party where the first of the brooch phenomena took place.
- George E. Linton and Virginia Hanson, eds., Readers Guide to The Mahatma Letters to A. P. Sinnett (Adyar, Chennai, India: Theosophical Publishing House, 1972), 219.