R. K. Thompson
3 appearances across 3 restored issues — every one readable in full, free.
The Cavalier, September 1910 — 1910 “That Affair at Spraycliff” · p.731 Read the full issue (210 pages) → 
The Argosy, April 1912 — 1912 “At Lone Willow Station” · p.103 Read the full issue (238 pages) → 
The Argosy, Christmas 1912 — 1912 “FLIRTING WITH DESPERATE HAZARD” (serial) · p.116 Read the full issue (276 pages) → Appearances are extracted from each issue's own printed contents page; entries we can't read confidently are withheld rather than guessed.