Sunday, May 15, 2011

OBQ 228...

The day everything changed...what does this image signifies?

Answer: Yes it was 22.10.1938 at Astoria where this first zerox copy was made by Chester Carlson.

10/10 for VK and Shitiz.


  1. Chester Carlson,the inventor of photocopying, made the first photocopy using a zinc plate covered with sulfur. The words "10-22-38 Astoria" were written on a microscope slide, which was placed on top of more sulfur and under a bright light. After the slide was removed, a mirror image of the words remained.

  2. On October 22, 1938, Chester Carlson invented xerography (commonly known as XEROX photocopiers).