Jump to content

File:Gramme Ring - Modern Form.png

Page contents not supported in other languages.
This is a file from the Wikimedia Commons
From Wikipedia, the free encyclopedia

Original file (1,144 × 440 pixels, file size: 90 KB, MIME type: image/png)

Description

Original text of illustration:

Figure 249: Modern form of the Gramme ring armature.

  • The core consists of a number of thin flat rings of well-annealed charcoal iron, the outer diameter of each ring or disc being 11.5 inches and its inner diameter 9.25 inches. Sheets of thin paper insulate each disc from its neighbors to prevent the flow of eddy currents.
  • The armature is mounted on a steel shaft to which is keyed a four-armed metal "spider", the extremes of whose arms fit into notches cut in the inner edges of the soft iron core rings, so that a good mechanical connection is obtained between the core and the shaft. The spider is made of a non-magnetic metal, to reduce the tendency to leakage of lines of force across the interior of the armature.
  • The armature inductors consist of cotton-covered copper wire of No. 9 standard wire gauge, wound around the core in one layer and offering a resistance, from brush to brush, of 0.048 ohm. There are two convolutions in each section, the adjacent ends of neighboring sections being soldered to radial lugs projecting from the commutator bars.

Public Domain source:

  • Hawkins Electrical Guide, Volume 1
  • Chapter 17: The Armature, Page 224.
  • Copyright 1917 by Theo. Audel & Co.
  • Printed in the United States

Scanned by Dale Mahalko, Gilman, WI, USA

DMahalko (talk) 22:01, 12 January 2008 (UTC)
Date 14 January 2008 (original upload date)
Source Transferred from en.wikipedia to Commons by J JMesserly.
Author The original uploader was DMahalko at English Wikipedia.

Original upload log

The original description page is/was here. All following user names refer to en.wikipedia.

  • 22:01, 12 January 2008 DMahalko 1,144×440 (90 KB)
    • (== Summary == TBD Public Domain source: * Hawkins Electrical Guide, Volume 1, Page 224. * Copyright 1917 by Theo. Audel & Co. * Printed in the United States Scanned by Dale Mahalko, Gilman, WI, USA J JMesserly (talk) 20:03, 7 January 2009 (UTC) == Licensing ==
Public domain
Public domain
This media file is in the public domain in the United States. This applies to U.S. works where the copyright has expired, often because its first publication occurred prior to January 1, 1929, and if not then due to lack of notice or renewal. See this page for further explanation.

United States
United States
This image might not be in the public domain outside of the United States; this especially applies in the countries and areas that do not apply the rule of the shorter term for US works, such as Canada, Mainland China (not Hong Kong or Macao), Germany, Mexico, and Switzerland. The creator and year of publication are essential information and must be provided. See Wikipedia:Public domain and Wikipedia:Copyrights for more details.

)

Captions

Add a one-line explanation of what this file represents

Items portrayed in this file

depicts

14 January 2008

image/png

File history

Click on a date/time to view the file as it appeared at that time.

Date/TimeThumbnailDimensionsUserComment
current20:03, 7 January 2009Thumbnail for version as of 20:03, 7 January 20091,144 × 440 (90 KB)J JMesserly{{Information |Description= Original text of illustration: Figure 249: Modern form of the Gramme ring armature. * The core consists of a number of thin flat rings of well-annealed charcoal iron, the outer diameter of each ring or disc being 11.5 inches a

The following 2 pages use this file:

Global file usage

The following other wikis use this file: