Damage due to massive flood in March 1936 in Johnstown Pennsylvania, known as the Saint Patrick's Day Flood. People gather on the streets in the flood affected areas. The destroyed buildings in the area. Names visible on some shops and buildings including Hendler Hotel, Valley Drug Co., Exide, Alderman, Penn Traffic Co. The wrecked vehicles in the flooded street. People viewing the damage. The debris on the street. The streets submerged in water. Buildings along the sides of the streets. Mountains in the background. Men clearing rubble with shovels. People viewing debris while standing on the steps of a building. A stopped street car or trolley car with flood debris on top of it.
Newly recruited U.S. Army soldiers in World War I, standing on a field, in uniform. Picks and shovels stacked on the ground. The soldiers carry the picks and shovels and dig foundations for training camp barracks buildings. Other soldiers standing in the background. The interior of a building. Doctors treating soldiers. The doctors inoculate the soldiers with vaccination shots to prevent them from contracting typhus.
U.S. Coast Guard cutters at sea. U.S. Coast Guard sailors on cutters in heavy seas. A sailor looks through binoculars from the observation deck. Another sailor looks through binoculars, keeps a watch, and informs the crew of a submarine sighting. The cutters attack and drop shells into the water. Massive underwater explosions. The crew mans and fires the deck gun. A pilot readies his plane. Oil from a leaking submarine floats on the water surface. Cutters at sea. A Coast Guard sailor and a SPARS (Coast Guard Women's Reserve) walk along the New York harbor. The Statue of Liberty in the background. The New York skyline as SPARS march. Voice narration in part by James Cagney and Ginger Rogers.
A woman runs towards a U.S. Coast Guard Vought OS2U Kingfisher floatplane on the shore. She hands over a paper to the pilot in the cockpit. Crew prepare and push the plane towards the ramp, and then slide the plane off the ramp into the water. The woman stands back and watches as the plane taxis in the water and takes off. A light house off shore. Narration by James Cagney.
Space Communications and the related problems and developments. Animation: Final formula expressing the relation between power transmitted and power received. Comparison of the distance between Earth and the moon, and Earth and Pluto. Factors effecting Space Communication. Payload factor: Effect of payload weight of a communication equipment, transport of equipment, need for small and light equipment. Limitations in miniaturization of components: Inaccessibility in term of maintenance and service. Depicts longevity of power based on available power sources. Advantages and drawbacks of chemical batteries, solar batteries, nuclear batteries. States methods for reducing power consumption: equipping vehicles with command transponders. Factors effecting Sapce Communication: Spatial environment and equipment used. Example of information required to study the planet Venus: atmospheric composition, surface temperature changes and exact period of rotation. Explains spatial movement and solution for this factor: Placing four equally spaced terrestrial stations around the globe, joint by reliable communication links for continuity and data reception.
Space Communications and the related problems and developments. Animation: Additional factors introduces into Space Communications by transmission and reception of data. Frequencies and bandwidths applicable to Space Communications. Factors to be weighed while considering bandwidth: Available power and transmission system required. Narrower bandwidths used to conserve power, they're also less affected by noise interference. Depicts consumption of power by television, spoken word and teletype bandwidths. Telemetry: low bandwidth and power consumption. Explains Telemetry. Theory of Modern Communication and Binary digits or BITS. Depicts information required from outer space like: radio activity level of the moon's surface, abundance of water vapor in the Martian atmosphere, and variation in surface temperature of Mercury. Telemetry utilizes relatively small bandwidth and thus used as preferable mode of communication for research vehicles.
CRITICALPAST.COM: About Us | Contact Us | FAQs - How to Order | License Agreement | My Account | My Lightboxes | Shopping Cart | Advanced Search | Featured Collections | Website Terms & Conditions | Privacy Policy | Links ©2024 CriticalPast LLC.
License Agreement |
Terms & Conditions |
Privacy Policy
©2024 CriticalPast LLC.