While this soldier's uniform resembles that of the Royal Artillery or Royal Engineers, the white cross belt he is
wearing appears to make him out as a member of another service, possibly the Royal Hospital Corps. The gold lace
band on his forage cap makes him out to have held sergeant's rank at the time.

Presented in the so-called gemtype format carte de visite formatted image is something of a rarity. Commonly called
tintypes in the United States this metal plate process was generally known as a ferrotype in Great Britian. This
specific format was known as a gemtype because of its extremely small size - usually no larger than 1 inch x 1 inch.
Gemtypes were usually produced in batches and sold mounted in paper Carte de Visite-sized mounts like this

Very wide spread in the United States the tintype or ferrotype never gained the same popularity in the United
Kingdom with this small format being even more uncommon.

Carte de Visite Formatted "Gemtype" (Ferrotype)
Walton's Gem Photographs - Photographer
New Biggate, Leeds, England
c. 1870s