Brief aerial view of 8200 block of Georgia Ave., Silver Spring MD. Pedestrians cross the street in front of the J.C. Penney Co. department store at 8650 Colesville Rd. Silver Spring, MD 20910. A man parks his 1965 Chevy Bel Air station wagon in front of a building. Close up of keys left in ignition after parking car. An alley filled with trash in an urban slum neighborhood. Trash and a child's tricycle in a vacant lot. Policemen writing reports, papers, and complaints for record keeping. A policeman searches through index cards in the Type of Crime File case file cabinet. View of a Police Beat Location map color-coded according to level of police activity. A policeman uses a spot map. A bar chart depicting types of crimes committed from April to June. Police chief presents during a community group meeting. A man uses a typewriter. A policeman writes a report. Operator pressing a button on an console controlling two IBM 729 Magnetic Tape Units. Policemen leave precinct on L Street in Washington D.C. precinct to begin their patrols. A policeman writes on his notebook while holding a card from the arrest index file. Policeman answers call. A police officer inside a grocery store. Policeman keeps writing notes in a ledger.
Training film showing different kinds of rebreather (or Oxygen Breathing Apparatus) used in mine rescues. Models show four types of rebreathers approved by the United States Bureau of Mines- Paul, Gibbs, Fleuss-Davis, and MC CAA. A man points to different parts of the rebreather- such as an oxygen bottle, reducing valve, regenerator, and by-pass valve. Men pump oxygen bottles before using the Oxygen Breathing Apparatus. An oxygen bottle is installed in Oxygen Breathing Apparatus. Men charge the regenerator with chemicals to absorb carbon dioxide from exhaling, places regenerator back to the Oxygen Breathing Apparatus. Man disinfects Oxygen Breathing Apparatus mouthpiece and tubes in a solution of bichloride of mercury or Lysol. Man rinses disinfected tubes with water before installing them back to the apparatus.
A rescue crew explores a mine. Rescue team with Oxygen Breathing Apparatus use elevator to enter the mine. Rescue team explore mine tunnel to search for trapped workers. Rescue team tests a lamp for presence of methane gas. Flame rises inside lamp due to methane gas in mine. Flame goes out in lamp due to lack of oxygen.
Canary in a coal mine and carbon monoxide detector use for rescue operations inside mines. Rescue team uses a carbon monoxide detector and a caged canary bird to detect presence of carbon monoxide. Canary bird in cage expires due to high carbon monoxide.
Psychological warfare operations (PSYOP) and information dissemination demonstration by the United States Army during the Cold War. A loudspeaker jeep hidden distantly behind clump of trees in a grassy field. A tank (likely a Sherman M4 tank) with a loudspeaker moves across a field. Leaflets distantly visible in the sky. A B-26 plane flies past a field. More leaflets fill the sky distantly visible. Leaflets falling on the fields. A United States Army L-16 plane flying low, dropping leaflets over soldiers.
Psychological warfare operations (PSYOP) and information dissemination demonstration by the United States Army during the Cold War. A jeep with a loudspeaker driving on a field, driving into the bush. Two United States soldiers set up a horn loaded loudspeaker array in a field. A soldier speaking into a microphone, probably a lip-ribbon microphone or "lip mic" used to amplify in noisy environments. Two soldiers arrange a horn loaded loudspeaker array into place behind bushes.
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.