Key points are not available for this paper at this time.
Countries/areas included: Austria, Hungary, Bosnia and Herzegovina, Canada, Russia, Finland, Sweden, Norway, British India, Roumania, Japan, United Kingdom of Great Britain and Ireland, Germany, France, Belgium, Spain and Portugal, Italy, The Netherlands, Switzerland, Denmark, Bulgaria, Servia, Greece, Turkey, China, Persia, British possessions in Asia, French possessions in Asia, Dutch possessions in Asia, Australia and Oceanica, Hawaii, French possessions in Africa, British possessions in Africa, The Sahara and Equatorial Zone, Mexico, Central America, South America, West Indies, United States.
Raphaël Zon (Sat,) studied this question.