In a mathematical sense, the curvature is the reciprocal of the radius, so that a smaller curvature implies a large radius. A curve of large radius, as for a railway, cannot be laid out by using the radius directly. We will see how the problem of laying out a curve of large radius is solved.
In 1983, Motorola released its first commercial mobile phone, known as the Motorola DynaTAC 8000X. The handset offered 30 minutes of talk-time, six hours standby, and could store 30 phone numbers. It also cost Â£2639 ($3995). In the very early days of the mobile space handsets werenât designed with consumers in mind.
It took 63 years for the first cell phone to be released to the public in Japan. It was invented by a man named Martin Cooper in 1973 while he was working for Motorola. So now you know when the cell phone was invented. Now letâs look at some interesting facts about the cell phone. Facts about cell phones: 1  The first cell phone released by Motorola was the DynaTec phone. 2  It cost a whopping $3,500 and did not sell particularly well to the general public (I wonder why!). 3  The Nokia Communication was the first mobile phone to enable wireless email and internet connection. 4  It was released in 1996.