Thoughts
Could the name have been an alias that he used (in which case why would his brother James also have this name)?
Were Joseph and James the same person perhaps?
Other records to look at…
Travel
J F Balmer (perhaps mistranscribed)
Male
32 (Abt 1883)
Occupation: Mining
Departure date: 22 Sept 1915
Departure port: England
Ship: Apapa
Destination port: Lagos, Nigeria
Mr J T Balmer
Male
44 (abt 1873)
Occupation: Mining
Departure date: 3 Jan 1917
Departure port: England
Ship: Burutu
Destination port: Iddo, Nigeria
Joseph Balmer
Service date: 1920-1935
Service place: India
Regiment: 2/4th Battalion The Border Regiment
Regiment No: 200642
Pte Joseph Balmer
26, 1884
Departure: Mombasa, Kenya
17 Aug 1910
Arrival: Southampton
Ship: Dover Castle