bressummer vs crossbeam

bressummer

noun
  • A large, horizontal supporting beam which bears the weight of a wall starting on a first or higher floor, particularly when exposed or used to support a jetty (timber-frame overhang construction). 

crossbeam

noun
  • A horizontal structural beam that runs perpendicular to the primary support beams; a girder. 

  • A beam laid across the bitts, to which the cable is fastened when riding at anchor. 

How often have the words bressummer and crossbeam occurred in a corpus of books? (source: Google Ngram Viewer )