Chump saw
The chump saw (also pull saw , chop saw , cross saw , blade saw or belly saw ) is a saw for lumberjacks and carpenters, with which beams or trunks are sawed. Due to its length (1.50 m to 2.00 m), it must be operated by two people who each pull the saw in one direction. The saw teeth are therefore ground on both sides.
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Wiktionary: Trummsäge - explanations of meanings, word origins, synonyms, translations
Commons : Two-man crosscut saws - collection of images, videos and audio files