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    COMPLEX NUMBER CALCULATOR OPERATIONAL
    January 8, 1940 - Bell Laboratories, U.S.A.

    George Stibitz's Complex Number Calculator was functional. He was a research mathematician at Bell Laboratories, who worked on its construction from Apr 1939, assisted by Samuel Williams. Later known as Bell Labs Model I Relay Computer, it used telephone relays and coded decimal numbers as groups of four binary digits (bits) each. It has been called the first electromechanical computer for routine use. A demonstration of its ability in remote computing was given on 11 Sep 1940, when messages were exchanged by phone lines between teletypewriter operators. Calculations suggested by attendees of the American Mathematical Society's meeting at Dartmouth College, Hanover, New Hampshire were communicated to an attendant at the keyboard of Stibitz's calculator in New York.

    BLACK AMERICAN INVENTION
    January 8, 1872 - U.S.A.

    A second U.S. patent was issued to Black American inventor Thomas Elkins for a new article of chamber furniture which he designated a "Chamber Commode" (No. 122,518). It provides a combination of "a bureau, mirror, book-rack, washstand, table, easy-chair, and earth-closet or chamber-stool," which might otherwise be constructed as several separate articles. Previously, a patent had been issued to Elkins on 22 Feb 1870 for a "Dining, Ironing Table and Quilting Frame Combined" (No. 100,020). Another patent was subsequently issued on 11 Apr 1879 for a "Refrigerating Apparatus" for "food or corpses," which provides a convenient container and method of chilling using the evaporation of water. (No. 221,222).

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All About 4wd RC Trucks :

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ARTICLE INFORMATION :

The article is dedicated to the description of radio controlled cars based on the remote control system, their types, designation and ways of exploitation.

ARTICLE CONTENT :

Radio controlled trucks, or RC cars as they are commonly referred to, are a fun way of spending time both for children and adults. Their work is founded on a system of remote control. One more type of remote control trucks is wire connection cars, but radio controlled cars are more popular. Radio controlled trucks are usually divided into two groups: toy model trucks produced for children and hobby-grade model which is designated for adolescents and adult people.

These 2 versions of radio controlled cars are different, but still have something in common. Both of them constitute copies of real vehicles and are controlled through radio control. But there're a certain number of distinctive differences between these two variants. First of all, a toy variant is a solid plastic representation of the car when at the same time the hobby-grade model is very close to a real-life vehicle in relation to outward appearance and individual parts. The hobby-grade models are designed in the same manner like a real truck.

Furthermore, this variant demands the same service and maintenance like you are the owner of a real life vehicle. There are various methods of powering hobby-grade RC cars. They could be electrically, fuel or even nitro powered. Making a decision which one to take isn't that easy. All the versions have their advantages and disadvantages that should be carefully thought over. For instance, an electric powered RC car will be lighter that a petrol run one, but the first will be slower than the last one.

Whatever the case, these trucks are so intricate, that every enthusiast can change his electric car into a fuel run one, or vice versa, without particular efforts.
What is so particular about hobby-grade radio-controlled cars that attracts attention of numerous men of all ages to them. In general, it's their complexity. It is not a toy, it's actually a real truck, but very small.

Moreover, these radio controlled cars can be used for racing and what man would refuse to feel oneself a racer. It is much more fun than computer games, that is why RC cars are so attractive to adult men.
Evidently, radio-controlled trucks are a wonderful pastime. But still do not forget that it will demand a lot of maintenance, repair and upgrading. So this hobby is quite expensive, but it is a truly unforgettable experience.

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