PugJesus@lemmy.worldM to HistoryPorn@lemmy.worldEnglish · 11 months agoTwo Imperial German sound locators for detecting airplanes, WW1, 1917lemmy.worldimagemessage-square18fedilinkarrow-up1255
arrow-up1255imageTwo Imperial German sound locators for detecting airplanes, WW1, 1917lemmy.worldPugJesus@lemmy.worldM to HistoryPorn@lemmy.worldEnglish · 11 months agomessage-square18fedilink
minus-squareCethin@lemmy.ziplinkfedilinkEnglisharrow-up9·11 months agoI assume magnification to spot planes. Basically binoculars without the need to hold them.
I assume magnification to spot planes. Basically binoculars without the need to hold them.