RECORD “SINGLES”
January 10, 1949 - 7-inch diameter 45 rpm, U.S.A.
RCA introduced the “single,” the 7-inch diameter 45 RPM record in the U.S.A single could play eight minutes of sound per side. Columbia had introduced the 12" long-playing vinyl 33 RPM as a new format the previous year. These formats greatly improved upon the 78 RPM records, which were limited to only 5 minutes per side on a 12" disk. Vinyl records were less fragile, and had a lower level of surface noise, but needed new playing equipment. RCA subsequently manufactured a record-player with a wide-diameter spindle to automatically play a stack of singles. The 45 RPM, 7" record was favored by the young, and became successful with the onset of rock and roll. In the UK sales of 45s overtook 78s early in 1958.
BLACK AMERICAN INVENTION
January 10, 1888 - U.S.A.
A U.S. patent was issued for the railway signal to the Black American inventor, A.B. Blackburn (No. 376,362). The type of signal was that designed to be operated by the wheels of a train. A lever was depressed as a train wheel travelled over it, to remotely operate an alert through a mechanical linkage upon the passing of the train. It was designed for use upon a single track railway line for trains passing in one direction. To provide a signal for trains passing in the opposite direction, a similar apparatus would be applied on the opposite rail. This patent was an improvement in mechanical design of his earlier patent No. 309,517 on 23 Dec 1884, in which he also described how a gong was activated to provide the alert.
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"...Rules for Happiness: Something to do, Someone to love, Something to hope for...."
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This is our Farm Equip category. If you are interested in Farm Equip, feel free to browse these listings. If you have a site that fits within this category, Submit it for inclusion.
Modern Farm Equipment exists to support the farm community through the sale of new and Used Equipment, and to back the sale with parts and efficient service. Our goals include to grow and prosper i...
TractorHouse is your headquarters for farm equipment used and new, including any John Deere tractor, tractor parts, used tractors for sale, farm tractor parts, used tractors including any Massey tr...
Manufacturer and Supplier of Massey Ferguson Tractor Parts, Tractor Parts Includes Engine Parts, Transmission Parts, Suspension Parts and more. We are One of the leading suppliers of spare parts, c...
Search Office Space was founded in 1993 by Richard Smith in order to bring together all elements of the serviced office space market into one convenient single point of contact, with clients having...
Each quarter, twenty general or topical web directories are evaluated and rated according to predetermined criteria. The top ten are placed in competition with one another and ten additional direct...
Unfortunately just like humans our pets will age too. With the aging process comes health problems and with health problems comes very expensive vet bills. Research you dog
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Friendship poems happen to be just the best medium of expressing eternal friendship to that special friend. You can let all the love and affection you possess flow out, right onto the paper lying in front of you, through a sweet little friendship.