Early Forties Ionosondes
Left. The forerunner of the Union Radio Ionsonde. R. Naismith operating.
Right. Another ionosonde of the early 1940's. W.M. Curtis operating.
Early Forties Ionosondes
Left. The forerunner of the Union Radio Ionsonde. R. Naismith operating.
Right. Another ionosonde of the early 1940's. W.M. Curtis operating.