Framed Prints
Framed Print of Early geophysical papers of the Society of Exploration Geophysicists
Early geophysical papers of the Society of Exploration Geophysicists. ; «»eci «tco«o«*c W/MW//M//////M//////M^ Fig. 2.—Elements of reflexion seismograph unit. INSTRUMENTS Instrumental design has followed widely separated paths, but there is evidence of convergence of these paths as the objective sought is more clearly visualised. Electrical detectors, usually referred to as seismometers, are uni- versally used, some employing moving coils in electromagnetic or permanent magnetic fields, some the carbon button microphone, and others the piezo-electric type of detector. Amplification of the w. Early geophysical papers of the Society of Exploration Geophysicists. ; «»eci «tco«o«*c W/MW//M//////M//////M^ Fig. 2.—Elements of reflexion seismograph unit. INSTRUMENTS Instrumental design has followed widely separated paths, but there is evidence of convergence of these paths as the objective sought is more clearly visualised. Electrical detectors, usually referred to as seismometers, are uni- versally used, some employing moving coils in electromagnetic or permanent magnetic fields, some the carbon button microphone, and others the piezo-electric type of detector. Amplification of the weak electrical image can be obtained by audio-frequency vacuum-tube amplifier circuits employing from one to many stages. Recording of the image is through either oscillographs or string galvanometers. In average commercial work timing of the interval between the explosion and the arrival of an event at a seismometer must be accurate within limits of 0.1%. This accuracy is readily obtainable by means of an electrically maintained tuning-fork which may be arranged either to drive a synchronous motor or a shutter which periodically interrupts the light beam of the galvanometer. Experience has shown that the greatest energy is carried by the component of the reflected longitu- dinal wave having a frequency ranging from 30 to 60 cycles per second, and it is standard practice to peak the frequency amplification 797. © The Bookworm Collection
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Media ID 41975499
Bookcentury1900 Button Coils Detector Electrical Electromagnetic Elements Evidence Fields Instrumental Instruments Magnetic Microphone Moving Objective Paths Permanent Reflexion Separated Type Unit
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 24.4cm x 14cm (9.6" x 5.5")
Estimated Product Size is 36cm x 31cm (14.2" x 12.2")
