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ENGINEER  AND  INVENTOR  April 1893

Greyscale technical patent drawing showing a dynamo electric machine with field magnets, rotating armature, shaft, bearings, and electrical connections, annotated with figure numbers and component labels
Detail view from Canadian Patent No. 42360 (Robt. Mundell and E. H. Johnson), illustrating the construction and arrangement of a dynamo electric machine, issued 21 March 1893.

Canadian Patents Issued

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Curator's Note

Vintage patents can appear intimidating at first glance. Their formal language, technical descriptions, and unfamiliar terminology often conceal ideas that are surprisingly practical once understood. Many readers discover that the challenge is not the invention itself, but knowing how to approach the document.

If this is your first encounter with nineteenth-century patents, we recommend reading our guide: How to Read a Victorian Era Patent. Using a real Canadian brewing patent from 1893 as a working example, it demonstrates a simple method for identifying the problem an inventor was trying to solve and understanding the mechanism proposed as the solution.

Patents preserve inventions, but they also preserve frustrations. Every specification is evidence that somebody looked at an existing process and decided it could be improved.

More articles to enjoy…

About this article

This article is a reprint of an existing article from Engineer and Inventor, April 1893. It is the intent of this website to present this article in human and machine readable form. Format and editing changes have been made. This article is provided for the purpose of enjoyment only. Statements in this article were relevant to the published period and may not be applicable in current times.

Version History

  1. [1893-04-01] Article published in print
  2. [2021-01-03] Initial digital transcription
  3. [2022-06-04] Editorial refresh
  4. [2022-06-19] Updated editorial
  5. [2025-12-14] Editorial refresh
  6. [2026-06-14] Added mention of ~ How to Read Victorial Era Patents ~ article