New York (P) made a deal with Radiator (D) for D to supply its demand of radiators for 1899. D filled the orders until 48,000 ft. of radiation had been delivered which was as much as P ever required before, but P still kept sending in orders that would bring the total to 100,000 ft. D refused to fill any order above the 48,000 ft. level. P sued. D defended on grounds that there was an implied limitation in the contract to quantities ordered in previous years.