ad

analog

degree

degrees

farad

instrument

pointer

scale

temperature

farenheit

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San Bernardino, California. Precooling Atchison, Topeka and Santa Fe Railroad refrigerator cars at the ice plant. Precooling lasts from four to eight hours depending upon the shippers request. Air at twenty degrees Farenheit is blown in one end and out the other. This action is reversed every fifteen minutes. 1000 cubic feet of air goes through the car per minute

San Bernardino, California. Precooling Atchison, Topeka and Santa Fe R...

Public domain photograph of 1930s-1940s US industrial development, Second World War, US war production, indusry, no copyright restrictions image - Picryl description

A model, in flight at a speed of more than 12,000 mph, was photographed by pulsed laser. The color image, taken approximately nine degrees from head-on, reveals temperatures on the nosetip, red area, as high as 7,460 degrees Farenheit

A model, in flight at a speed of more than 12,000 mph, was photographe...

The original finding aid described this photograph as: Base: Arnold Air Force Station State: Tennessee (TN) Country: United States Of America (USA) Scene Camera Operator: Unknown Release Status: Released t... More

A group of three blue clocks sitting on top of a black wall. Technology instrument ad, science technology.

A group of three blue clocks sitting on top of a black wall. Technolog...

Three gauges in the dark, with a blue glow / Three blue lights in the dark / Public domain space exploration photo.

A close up of a clock in the dark. Instrument ad analog, music.

A close up of a clock in the dark. Instrument ad analog, music.

A blue gauge with the temperature of thermometer in the background / A blue ball with a temperature gauge in the middle public domain military photo.