"Porter's telegraph college" on papers, "Densmore & Porter" on a book


The early history of the typewriter, by Chas. E. Weller...
Main Author: Weller, Charles Edward, 1840-1925.
Language(s): English
Published: La Porte, Ind., Chase & Shepard, printers, 1918.
Subjects: Sholes, Christopher Latham, > 1819-1890.
Typewriters > History.
Physical Description: 87 p. incl. illus., port. 16 cm.
Catalog Record: The early history of the typewriter | Hathi Trust Digital Library:
I suppose as follows:

  • Porter's Telegraph college
  • Porter's National Telegraph college 
There are some periods while Porter inform his typewriter to publication or not.

very short period  while 1868?

or 1870?

What was said on the circular of his colleges?

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