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United States USA 1922 stock footage and images

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Means of forecasting avalanches include wind wane, dropping barometer and a gust thermometer.

A training film about the dangers posed by avalanches and the methods to control them in Alta, Utah. An airborne avalanche occurs as snow moves down a dam slide. Some of the snow whirls up with the wind while the rest falls on the ground. Snow moves down as a snow cloud is formed along the slope of Mount Superior. Means of forecasting avalanches include a dropping barometer and a wind wane indicating direction of wind blow. Snow blows from the slope of one mountain to another. A gust thermometer to measure velocity variation of wind. A graph indicates wind speed in miles per hour.

Location: Alta Utah USA
Date: 1950
Duration: 2 min 26 sec
Sound: Yes
Color: Color
Clip Type: Edited
Language: English
Clip: 65675059579
Means of forecasting avalanches include precipitation gauge, settlement gauge and snow stakes.

A training film about the means of forecasting avalanches in Alta, Utah. A special precipitation gauge that collects the horizontal component. A revolving chart in the gauge that records the amount of accumulated snow. Snow stakes being used to record the depth of snow and amount of snow fall. A settlement gauge placed on a snow covered surface and clipped to a resistance wire. A test set of the settlement gauge being used to determine the position of settlement gauge. A thermometer attached to the test set enables to record the temperature as well.

Location: Alta Utah USA
Date: 1950
Duration: 1 min 25 sec
Sound: Yes
Color: Color
Clip Type: Edited
Language: English
Clip: 65675059580
Snow cover behavior and stability being observed and recorded with the help of instruments in Alta, Utah.

A training film about the means of forecasting avalanches in Alta, Utah. A Ram Penetrometer being used by a ranger to observe and study the behavior of snow cover. It measures the hardness of snow. A ranger digs a pit alongside the penetrometer with a shovel. Snow temperature being recorded with the help of a dial thermometer in the dugout. Layering of snow being recorded by the ranger to detect an avalanche. About half meter long sample tubes being inserted in different layers of snow. Sample tubes being removed and weighed to determine the water content and stability. Similar tests being conducted along a fracture line. A ranger with a penetrometer at the fracture line. Snow layers being observed and recorded at the fracture line. Ram resistance and slope angles being measured and recorded at the fracture point to make a profile of the fracture line.

Location: Alta Utah USA
Date: 1950
Duration: 3 min 40 sec
Sound: Yes
Color: Color
Clip Type: Edited
Language: English
Clip: 65675059581
Snow rangers ski down the test slopes to detect the actual behavior of the snow cover in Alta, Utah.

A training film about the means of forecasting avalanches in Alta, Utah. A snow ranger skis down a test slope in Alta, Utah to detect the actual behavior of the snow cover. Snow drifts down a slope setting in motion a slab avalanche. A ranger test skies along the sides of a slope avoiding the center of the slopes. Snow being dislodged and drifts down due to test skiing. Ranger falls down while skiing.

Location: Alta Utah USA
Date: 1950
Duration: 2 min 40 sec
Sound: Yes
Color: Color
Clip Type: Edited
Language: English
Clip: 65675059582
Test skiing, explosives and avalauncher being used to detect the occurrence of an avalanche in Alta, Utah.

A training film about the means of forecasting avalanches in Alta, Utah. A snow ranger skies down a slope during testing. Incorrect and correct or safer ways of test skiing demonstrated. Explosives being used to set an avalanche in motion. Cables attached and a charge package of TNT (Trinitrotoluene) prepared. Fuse lit up with an igniter. A man throws the charge and explosion results in a crater indicating the least possibility of occurrence of an avalanche. Another man throws a charge and results in slab avalanche as snow breaks up in blocks. An electric cap being used to control time of detonation of explosive. A man throws the charge and a slab avalanche occurs as a result of a slide set on motion by the explosion. A man works on a projectile called avalauncher. Men work on the projectile and fire it at a slope.

Location: Alta Utah USA
Date: 1950
Duration: 6 min 39 sec
Sound: Yes
Color: Color
Clip Type: Edited
Language: English
Clip: 65675059583
Military weapons like 81 mm mortar and 75 mm Howitzer being used to set off avalanches in Alta, Utah.

A training film about the means of forecasting and controlling avalanches in Alta, Utah. A 81 mm mortar being used to set off an avalanche. Men work on the mortar. A 75 mm Mountain Howitzer being worked on for setting off an avalanche. Men load a shell into the Howitzer and fire. A slab avalanche is set off as snow drifts down a slope. A dust cloud is formed.

Location: Alta Utah USA
Date: 1950
Duration: 1 min 19 sec
Sound: Yes
Color: Color
Clip Type: Edited
Language: English
Clip: 65675059584
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