Show I Listening Post in In Our Canal Defenses o 14 t- t y 4 r V f. f rn T. T r rr r r v r Left Amid the dense jungle of the Chagres river section of the Panama Canal Zone a listening post of our growing air defenses is shown in action under eyes of Brig Gen Sandford Jarman commanding Panama coast artillery brigade Right Ruins of ancient Fort San Lorenzo Sixteenth century strong point are used for camp site by men of the Canal Zones Zone's artillery brigade The fort is at the Atlantic entrance of the canal |