WWII Imperial Japanese Guide, 1941 Lighting & Listening Devices

  
World war 2 imperial japanese manual. Up for sale is a unique piece of World War II history: An Imperial Japanese military guidebook, published by the Military Personnel Library in 1941, focusing on the usage of lighting and listening devices. These devices were integral to the Japanese military's information gathering, with lighting equipment used to detect enemy aircraft in the dark, and listening devices employed to capture the sound of airborne aircraft to determine their position and direction. Despite the advancement of radar technology, the lack of similar sophisticated technology in Japan meant that these listening devices were still in use towards the end of the Pacific War. Under optimal conditions, these devices were capable of detecting targets up to approximately 10km away.