Peacock Brothers Limited, LaSalle, Montreal.  4-page stapled booklet describing this regulator.  Stiff card wraps have some edge and cover wear, very small lower front corner bend, small stains on rear wrap.  Interior clean and unmarked with a bit of rust on staples; black & white illustrations.  ‘The regulator comprises a float gear unit working in conjunction with a separate check valve, and is designed to maintain a steady feed through the pump and heaters to the boiler, equivalent to the rate of evaporation.’ (from p. 1)