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+"United States USA" +1931 stock footage and images
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Thermograph is seen among scientific instruments used for weather forecasting in the United States
Scientific instruments used for weather forecast at a weather bureau in United States. A thermograph shows an increase and decrease in the temperature.
Rain Gauge used for weather analysis and forecasting in the United States
Scientific instruments used for weather forecast at a weather bureau in United States. A man takes out water from a rain gauge into a tumbler and measures the amount of rainfall with a scale. He records the data.
Upper atmospheric conditions exert an influence on weather
Over cast sky. Conditions in upper atmosphere exert an influence on weather conditions.
Balloons and air planes used to study cloud formation
A man fixes a balloon onto a machine. Balloon inflates as hydrogen fills into it. Balloon release to forecast weather conditions and study cloud formation. Man looks through telescope of theodolite and records observations. Airplane and big Army balloon used to study cloud formation.
Process of cloud formation
Clouds in he sky. Explains the process of cloud formation in the atmosphere by evaporation and condensation. Importance of cloud formation on weather as a whole.
Effect of high and low pressure on weather conditions
Concepts of high and low pressure and moving air masses and their effects on weather conditions. Direction of wind flow in high and low pressure areas. A map shows high and low pressure areas in America during different times in year.