Word: skies
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Dates: during 1930-1939
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...artillery opened up. From Far back in France, big shells roared through the sky "making the sound of thunder which accompanies sheet lightning." Each shell took 68 seconds to reach its destination in Germany after a flight of some nine miles. "The angry 'pang, pang, pang' of French 755 joined in the chorus. Their shells followed a short trajectory and made a sharper, hissing sound above us." German shells came back over, bursting far in the rear, each making a wide glow in the night...
...Schmidt camera is unique among astronomy telescope in giving sharp focus over a large area of the sky. Light enters the telescope through a correcting lens, travels onto a spherical concave mirror, and is reflected back onto the film which is also curved...
Improvements of the famous Schmidt astronomical camera worked out by James G. Baker Junior Fellow, open possibilities of a new sky-camera which is now being constructed in cooperation with amateur Boston Telescope makers, it was announced by the Observatory yesterday...
...photograph of a rare outdoor night scene showing long, slim, spindle-shaped pillars of fire apparently streaming into the sky was last week turned up by Scientific American. Taken by an amateur photographer at Wilbur, Wash., it was a picture of the meteorological phenomenon called "pillar halos." One authority on the physics of the air, Dr. William Jackson Humphreys of the U. S. Weather Bureau, pronounced it the best picture of pillar halos he had ever seen...
That the night was clear when this picture was taken is shown by the short, concentric arcs on the dark background of the sky-star trails made during the photographer's five-minute exposure...