Framed Prints
Framed Print of Ammonia MASER, First Atomic Clock
An atomic clock is a clock device that uses an electronic transition frequency in the microwave, optical, or ultraviolet region of the electromagnetic spectrum of atoms as a frequency standard for its timekeeping element. The principle of operation of an atomic clock is not based on nuclear physics, but rather on atomic physics; it uses the microwave signal that electrons in atoms emit when they change energy levels. The idea of using atomic transitions to measure time was first suggested by Lord Kelvin in 1879. Magnetic resonance, developed in the 1930s by Isidor Rabi, became the practical method for doing this. In 1945, Rabi first publicly suggested that atomic beam magnetic resonance might be used as the basis of a clock. The first atomic clock was an ammonia maser (microwave amplification by stimulated emission of radiation) device built in 1949 at the U.S. National Bureau of Standards (NBS, now NIST). The world's first atomic clock using the ammonia molecule as the source of vibrations. © NIST / Science Source
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Media ID 47341057
20th Accuracy Accurate Atomic Clock Clocks Device Devices Emission Frequency Horology Instrument Instruments Machine Machinery Machines Measure Measurement Measurements Metrology Nist Precision Primary Radiation Stable Standard Standards Technology Time Twentieth
Modern Frame 14"x12" (36x31cm)
Ready to Hang Contemporary Framed Prints adds style, protection, and a polished touch to your space - effortlessly.
Your artwork will be printed as shown in the preview. To adjust please select Edit Printed Image under the Buy button
Wood effect frame, card mounted, 10x8 fade resistant photo print. Overall outside dimensions 14x12 inches (36x31cm). Environmentally and ozone friendly, 40mm wide x 15mm Polycore® moulding has the look of real wood, is durable and light and easy to hang. Biodegradable and made with non-chlorinated gases (no toxic fumes) it is efficient; producing 100 tons of polystyrene can save 300 tons of trees! Prints are glazed with lightweight, shatterproof, optical clarity acrylic (providing the same general protection from the environment as glass). The back is stapled hardboard with a sawtooth hanger attached. Note: measurements provided are estimated outer dimensions, which include both the image and the frame. While we aim to keep sizing consistent, exact dimensions may vary slightly due to differences in print size or production requirements, which may result in a variation in the overall size (up to approximately 2.5cm (1"))
These are individually made so all sizes are approximate
Estimated Image Size (if not cropped) is 17.9cm x 24.4cm (7" x 9.6")
Estimated Product Size is 31cm x 36cm (12.2" x 14.2")
