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.
Things have certainly changed a bit since then... By Adrian Lee. Martin Cooper, the father of the cell phone, with the first cell phone he used 30 years ago. The first mobile telephone call was made on April 3, 1973 by Martin Cooper, a former Motorola inventor, who is known as the father of the cellphone.y 1990 there were a million users. The first mobile phone call made in the UK was in 1985 when comedian Ernie Wise called from London to Vodafone's offices in Newbury, Berkshire. Mobile phones went on sale here two years later costing Â£1,200 each and became the mustâhave gadget of the yuppie.