Statistics for occurrence #1 of “Gatling” in entry cannon of Harper's Encyclopedia of United States History:

...ndry, 1860. 15-in. Rodman gun, weighing 49,000 lbs., cast by the South Boston Iron Company, 1860. Parrott gun first put to test of active warfare in the battle of Bull Run, July 21, 1861. Gatling rapid-firing gun, from five to ten barrels around one common axis; tenbarrel Gatling discharges 1,200 shots a minute; range, 3,000 yds.; invented in 1861. S. B. Dean, of South Boston Iron Company...
Max. Freq. Min. Freq.
Entity Corpus Doc Corpus Doc  
Richard Jordan Gatling 13 10 1 0 0 user votes
Gatling 8 0 0 0 0 user votes
Riddick Gatling 3 0 1 0 0 user votes
Jonathan Gatling 2 0 0 0 0 user votes
John Gatling 1 0 1 0 0 user votes

† This entity has been selected by the automated classifier as the most likely match in this context. It may or may not be the correct match.