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.
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.
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We like to think of ourselves as a bespoke chauffeur service, in that any request by yourself can be fulfilled by us. We can tailor any journey or event to your requirements, from drinks and newspa...
Is not just a name, but it's a commitment. We are a reputed and professionally managed company which has been in the business of Travel & Entertainment and Event Management for over 28 years. Explo...
Champagne hot air Balloon flights over Berkshire, Hampshire, Hertfordshire, Oxford, Surrey and London. The perfect surprise gift for that special occasion - Birthday Presents, Valentine Surprises, ...
Horseback riding in Las Vegas. Choose from rides that include breakfast, lunch, or a sunset steak dinner. Overnight Las Vegas horseback tours also available.
Open a Citizens Bank account and discover convenient online banking features and the personal finance options that you deserve. Choose a checking account or high interest savings account that fits ...
A group of people with the same desire to help rescue and save small breed dogs from high-kill shelters throughout the united states and find them loving forever homes. We are always looking for vo...
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
Search engine is the term with which we are accustomed with very much. But the web directory is not that same. The web directories are older than search engines according to the time of their invention.