This free pattern originally published in:
Royal Society #4, Hand Crochet 
ROYAL SOCIETY RUG COTTON, 1 ball will make 2 pot holders, each about 7½ inches square.
Bone Crochet Hook No. 8.
ROYAL SOCIETY RUG COTTON, 1 ball will make 2 pot holders, each about 7½ inches square.
Bone Crochet Hook No. 8.
ROYAL SOCIETY RUG COTTON, 1 ball of any color.
Bone Crochet Hook No. 8.
ROYAL SOCIETY "EVERSHEEN", 400-yard ball: 1 ball of Ecru and 1 ball of Green will make 1 large mat, 2 small mats and 1 pot holder.
ROYAL SOCIETY "EVERSHEEN", 1 ball each of Ecru and Dark Green and 2 balls of Light Green.
Hot Plate Mats
Star Book 70
American Thread Company
Original Copyright 1950
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Fourteen fun and colorful crochet hot plate mat patterns.
ROYAL SOCIETY "EVERSHEEN", 400-yard ball: 1 ball of White or Ecru.
Royal Mouliné, 1 skein of blue.
Steel Crochet Hook No. 7.
ROYAL SOCIETY RUG COTTON, 7 balls of Barberry Red and 1 ball of White.
Bone Crochet Hook No. 8.
ROYAL SOCIETY SIX CORD CORDICHET, Size 30: Small Ball: 9 balls of any color, or Large Ball: 4 balls of White or Ecru.
Steel Crochet Hook No. 10.
ROYAL SOCIETY "EVERSHEEN," 400-yard balls: 2 balls of White or Ecru.
Steel Crochet Hook No. 7.
ROYAL SOCIETY "EVERSHEEN", 400-yard balls: 2 balls of White or Ecru.