Mungojerrie and Rumpleteazer by Rumpleteazer. They pretend to be dogs in one song, "The Awefull Battle of the Pekes and the Pollicles". Onstage, Mungojerrie and Rumpleteazer are usually costumed as orange, black and brown calico or tabby cats. Their relation, be it siblings, friends or mates, is unknown. In the original Broadway production, they wore baggy clown-like costumes seemingly made of various food wrappers as characters performing for Bustopher Jones. Generally, Mungojerrie's costume is a darker, more heavily striped tabby pattern, while Rumpleteazer is paler. However, when they perform their duet song, they have additional costume pieces that vary by which version of
What Engineers Know and How They Know It What Engineers Know and How They Know It What Engineers Know and How they Know It: Analytical Studies from Aeronautical History (The Johns Hopkins University Press, 1990) () is a historical reflection on engineering practice in US aeronautics from 1908 to 1953 written by an accomplished practitioner and instructor. This period represents the dawn of aviation which was fraught with uncertainties and numerous paths to many possible worlds. The book captures two main conclusions from this period. The first order conclusion of this book is about "what engineers know." Five case studies from the history of aeronautical engineering are used