50, 100 & 150 years ago.

• Localización: Scientific American, ISSN 0036-8733, Vol. 300, Nº. 4, 2009, págs. 14-14
• Idioma: inglés
• Texto completo no disponible (Saber más ...)
• Resumen

  • Excerpts from previous issues of this journal printed in April 1959, April 1909, and April 1859 are presented. Information on an attempt to dig down to the Mohorovicic discontinuity that was started in 1909 is presented. Articles on the use of aluminum in coins dating from 1859 and 1909 are noted. Patent agency services offered by the staff of this magazine in 1859 are also noted.