In the earliest days of electricity, there was no way to directly display a waveform visually. Because scientists studying electrical phenomena frequently found it useful to have the waveforms displayed in visual form, early researchers laboriously hand-plotted the readings from a galvanometer on graph paper. However, rapidly changing readings could be missed, simply because of limits on human attention and reaction times. As a result, scientists developed various tools for plotting the waveforms mechanically. However, most of these devices used various kinds of pens or styli on paper, and while they did make a permanent record, they often ran into limitations related to the latency of mechanical systems.

When Karl Ferdinand Braun realized that the Crookes tube (an early prototype of the cathode-ray tube, or CRT), could be modified so that it would trace the waveform of an electrical signal across its flat end, he scored a major coup for all scientists and engineers working with electricity. Braun's oscilloscope provided them with a real-time indicator of a waveform's changes as they were occurring, which allowed researchers to observe events they might not necessarily want or be able to capture on a paper-based system.

Although Braun originally created the oscilloscope as an interesting demonstration of certain phenomena of electrical physics, he realized its practical use when radio inventor Guglielmo Marconi filed for a patent and had to reveal that his transmitter could only send a signal a dozen miles. Puzzled at this limited range, Braun contacted Marconi and as a result was able to investigate Marconi's equipment with his newly invented oscilloscope.

As a result, Braun was able to identify several of the key factors that were limiting Marconi's success, in particular the loss of energy to sparking in the antenna. This collaboration led to Braun sharing the 1909 Nobel Prize in Physics with Marconi.

As the oscilloscope was adopted widely by scientists and engineers around the world, other uses for it were soon realized. Russian scientist and inventor Boris Rosing used a modified version of it to display his early television experiments, and Rosing's protege Vladimir Zworykin would remember those works when designing the receiver for his own iconoscope television camera tube. As American and British military researchers developed radar as an air-defense technology, they used oscilloscopes modified to scan radially rather than horizontally to display the returns.

Another important use of the oscilloscope was in medical monitoring. As such devices as the electrocardiograph (ECG or EKG) and electroencephalograph (EEG) were developed to detect and display electrical activity of the heart and brain, respectively, doctors working in clinical situations often wanted to be able to see moment-by-moment activity levels rather than produce a permanent record. Thus, an oscilloscope was calibrated to show normal parameters for the physiological response being measured, so that medical personnel could tell at a glance whether a patient's heartbeat or other electrical activity was normal or awry.

Even in the digital age, the oscilloscope remained an important device, although increasingly CRT-based oscilloscopes gave way to ones using analog-to-digital conversion systems to display their readouts on flat-panel screens, generally a liquid crystal display (LCD). These solid-state digital oscilloscopes enjoy the advantages of lower power consumption, greater ruggedness, and better memory functions for the comparison of waveforms over time.

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