50 AND 100 YEARS AGO.

Item request has been placed! ×
Item request cannot be made. ×
loading   Processing Request
  • Additional Information
    • Subject Terms:
    • Abstract:
      The article highlights several developments and discoveries related to science and technology. The great tower telescope having an image of the sun 16 inches in diameter, was used by astronomers Edison Pettit and Seth B. Nicholson at the Mount Wilson Observatory. Professor Hermann von Helmholtz has presented a lecture and concluded that the atom of every chemical element is always united with a definite unvarying quantity of electricity.