Early disc records were made of various materials
including hard rubber. From 1897 onwards, earlier
materials were largely replaced by a rather
brittle formula of 25% "shellac" (a
material obtained from the excretion of a southeast
Asian beetle), a filler of a cotton compound
similar to manila paper, powdered slate, and
a small amount of a wax lubricant. The mass
production of shellac records began in 1898
in Hanover, Germany. Shellac records were the
most common until the 1950s. Unbreakable records,
usually of celluloid (an early form of plastic)
on a pasteboard base, were made from 1904 onwards,
but they suffered from an exceptionally high
level of surface noise.
In
the 1890s the early recording formats of discs
were usually seven inches (nominally 17.5 cm)
in diameter. By 1910 the 10-inch (25.4cm) record
was by far the most popular standard, holding
about three minutes of music or entertainment
on a side. From 1903 onwards, 12-inch records
(30.5cm) were also commercially sold, mostly
of classical music or operatic selections, with
four-five minutes of music per side.
Such
records were usually sold separately, in plain
paper or cardboard sleeves that may have been
printed to show the producer or the retailer's
name and, starting in the 1930s, in collections
held in paper sleeves in a cardboard or leather
book, similar to a photograph album, and called
record albums. Empty record albums were also
sold that customers could use to store their
records in.
While
a 78 rpm record is brittle and relatively easily
broken, both the microgroove LP 33.3 rpm record
and the 45 rpm single records are made from
vinyl plastic that is flexible and unbreakable
in normal use. However, the vinyl records are
easier to scratch or gouge. 78s come in a variety
of sizes, the most common being 10 inches (25
cm), and 12 inches (30 cm) in diameter, (sometimes
6-8 inches in the UK), and these were originally
sold in either paper or card covers, generally
with a circular cutout allowing the record label
to be seen. The Long-Playing records (LPs) usually
come in a paper sleeve within a colour printed
card jacket which also provides a track listing.
45 rpm singles and EPs (Extended Play) are of
a 7-inch (17.5 cm) diameter, the earlier copies
being sold in paper covers.
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In 1930, RCA Victor launched the first commercially
available vinyl long-playing record, marketed
as "Program Transcription" discs.
These revolutionary discs were designed for
playback at 33? rpm and pressed on a 30 cm diameter
flexible plastic disc. In Roland Gelatt's book
The Fabulous Phonograph, the author notes that
RCA Victor's early introduction of a long-play
disc was a commercial failure for several reasons
including the lack of affordable, reliable consumer
playback equipment and consumer wariness during
the Great Depression.
However,
vinyl's lower surface noise level than shellac
was not forgotten, nor was its durability. In
the late 30's, radio commercials and prerecorded
radio programs being sent to disc jockeys started
being stamped in vinyl, so they would not break
in the mail. In the mid-40's, special DJ copies
of records started being made of vinyl also,
for the same reason. These were all 78 RPM.
During and after World War II when shellac supplies
were extremely limited, some 78 rpm records
were pressed in vinyl instead of shellac (wax),
particularly the six-minute 12" (30 cm)
78 rpm records produced by V-Disc for distribution
to US troops in World War II. In the 40's, radio
transcriptions, which were usually on 16 inch
records, but sometimes 12 inch, were always
made of vinyl, but cut at 33 1/3 rpm. Shorter
transcriptions were often cut at 78 rpm.
Beginning
in 1939, Columbia Records continued development
of this technology. Dr. Peter Goldmark and his
staff undertook exhaustive efforts to address
problems of recording and playing back narrow
grooves and developing an inexpensive, reliable
consumer playback system. In 1948, the 12"
(30 cm) Long Play (LP) 33? rpm microgroove record
album was introduced by the Columbia Record
at a dramatic New York press conference. In
1949, RCA Victor released the first 45 RPM single,
7" in diameter, with a large center hole
to accommodate an automatic play mechanism on
the changer, so a stack of singles would drop
down one record at a time automatically after
each play. Early 45 RPM records were made from
either vinyl or polystyrene. |