Before the Internet, cellphone apps, and personal computers, many calculations began with a lookup table, chart, or nomograph. In the case of long distance radio operators seeking distance and direction information for pointing antennas, it took a map like this one published by Radio News & Short-Wave magazine in 1934. Distance are all relative to New York (NYers have always considered themselves the center of the universe ), so operators in other locales need to compensate. Here is one example of many online great circle calculators that allow you to enter two sets of longitude and latitude. Unfortunately, I do not have the next month's edition for be able to post the second chart mentioned.
July 1934 Radio News & Short-Wave
Wax nostalgic about and learn from the history of early electronics.
See articles from Radio &
Television News, published 1919 - 1959. All copyrights hereby acknowledged.
World Distance Chart No. 1HOW TO USE THE WORLD DISTANCE CHART
To use the map first find the distance in inches between New York and the desired point, multiply this by the miles per inch shown on the scale on the chart and the answer will be a close approximation to the air line distance between the two points. This chart is reproduced from the March, 1933, issue of RADIO NEWS for the benefit of our new short-wave readers. Chart Number Two will be published next month
World Distance Chart No. 1
Posted July 29, 2013