John Falconer, British Library
A Biographical Dictionary of 19th Century Photographers in South and South-East Asia
In October 1861, while stationed at Gwalior, undertook to take ethnographical photographs for Government for transmission to the International Exhibition of 1862. However, he was posted to Meerut in November 1861 and C.S. Haygarth (qv) offered to take on the commission in his stead. He had, however, evidently made some unsuccessful attempts before his tranfer, as evidenced by a letter from Major R.J. Meade, in temporary charge of the Gwalior Agency, to the Governor-Generalís Agent for Central India, dated Phool Bagh, 19 December 1861:
...I regret to have to inform you that, owing to his Chemical being of inferior quality or some other cause with which I am unacquainted, Captain Sladen failed in his attempt to take good Photographic likenesses of the Natives of this District, selected to sit to him for that purpose; and that his removal from this station to Meerut last month, before he could procure a fresh supply of chemicals, has prevented his renewing his efforts to carry out the arrangement sanctioned by Government...
- Λ India Foreign Proceedings (General), January 1862, IOR/P/205/10 p. 33.