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The Indian Head Test Card
The Indian Head Test Card was a black and white television test pattern which was introduced in 1939 by RCA of Harrison, New Jersey as a part of the RCATK-1 Monoscope. Twentieth century television later became so important socially that this purely technical electronic instrument (covertly identified as a branded industrial product) became a historical cultural icon of television's early days as a mass medium. Its name comes from the original art of an American Indian featured on the card.
Contents
1 As television broadcasting ritual
2 As television system tool
3 As cultural icon
3.1 Television appearances
3.2 Film appearances
3.3 Other appearances
4 References and Notes
5 External links
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As television broadcasting ritual
The Indian Head Test Pattern became familiar to the large post-war Baby Boom TV audiences in America from 1947 onwards; it would often follow the formal television station sign-off after the United States national anthem. The Indian Head was also used in Canada, following the Canadian national anthem sign-off in the evening. This test pattern was later used by Venezuelan TV channel Venevision, in conjunction with the RMA Resolution Chart 1941, in the mid and late 70s before the Venezuelan anthem (Gloria al bravo pueblo).
The Indian Head pattern could variously be seen: after sign-off but while the station was still transmitting; while transmitting prior to a typical 6 AM formal sign-on; or even during the daylight morning hours on newer low budget stations, which typically began their broadcast day with midday local programs around 10 or 11 AM.
During the late 1950s the test pattern gradually began to be seen less frequently, after fewer sign-offs, on fewer stations, and for shorter periods in the morning, since new and improved TV broadcast equipment required less adjusting. In later years the test pattern was transmitted for as little as a minute after studio sign-off while the transmitter engineer logged required FCC-USA/Industry Canada transmitter readings, and then turned off the power.
Towards the end of the Indian Head TV era, there was no nightly test pattern on some stations, typically when automatic logging and remote transmitter controls allowed shutdown of power immediately after the formal sign-off. After an immediate transmitter power off, in lieu of the Indian Head Test Card and its sine wave tone, a TV viewer heard a loud audio hiss like FM radio interstation noise and saw the video noise colloquially called snow (but resembling "bugs" following a TV-system technical improvement). Audio and video noise received on Indian Head era TV sets, respectively indicated the absence of analog aural and visual broadcast carriers. Consumer TVs typically did not have a no-signal noise muting and blanking feature until the late analog TV period.
When USA broadcasters transitioned to color television, the SMPTE color bars superseded the black-and-white test pattern image. In Sweden the Indian head was used in test transmissions from the Royal Institute of Technology from 1948 until November 1958 when it was replaced by the Sveriges Television test card.
As television system tool
The primary and critical Indian Head Test Pattern was not itself a card. Rather, it was generated directly as a monochrome video signal by means of a monoscope camera.
An RCA TK-1 Monoscope Camera is a 19-inch rack-mounted chassis, which contains electronic circuits needed to operate a glass cathode ray tube housed inside of an anti-magnetic steel shield. The cathode ray component is a TV-camera vacuum tube known as a monoscope, because it videographs only one still image, the test pattern. The tube has a perfectly proportioned copy of the test pattern master art inside, permanently deposited as a carbon image on an aluminum target plate. This perfect copy allowed all of the studio and control room video picture monitors, and home television sets, to be identically adjusted for minimum distortions such as ovals instead of circles. When the monitor or TV set was correctly adjusted to show test pattern circles, the received picture's aspect ratio was exactly three units high by four units wide. The 3 by 4 standard was chosen by the National Television System Committee (NTSC) for analog television, so that film movies would be compatible with TV broadcasting. 3 by 4 is the same aspect ratio used by 16mm and classic 35mm motion picture film frames.
Only after the monitors were adjusted was an actual Indian Head Test Card used. A cardboard mounted lithograph of the test pattern was typically attached to a rolling vertical easel in each TV studio, to be videographed by each studio camera during test time. Then the cameras were adjusted to appear identical on picture monitors, by alternately switching between and comparing the monoscope...(and so on)

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