跳至內容

File:Sturgeon electromagnet.png

頁面內容不支援其他語言。
這個檔案來自維基共享資源
維基百科,自由的百科全書

Sturgeon_electromagnet.png (422 × 600 像素,檔案大小:32 KB,MIME 類型:image/png


摘要

描述
English: Drawing of the first electromagnet, invented in 1824 by British scientist William Sturgeon. This was his original drawing from his 1824 paper to the British Royal Society of Arts, Manufactures, and Commerce. It was made of 18 turns of bare copper wire (insulated wire had not been invented) on a U-shaped lacquered iron core about 1 ft (30 cm) long and 1/2 inch (13 mm) diameter. When the wires were connected to a single cell copper-zinc-acid battery, the electromagnet could support 9 pounds. The little cups contain mercury and were an early method of making an electrical contact between wires. The one on the left acts as a power switch. Alterations to image: converted from JPG to 32color PNG.
(Detailed information is from Sylvanus P. Thompson (1891) Lectures on the Electromagnet, W.J. Johnson Co., New York, p.17-19)
日期
來源 Downloaded August 9, 2008 from Joseph Henry's contributions to the Electromagnet, Smithsonian Institution Archives, neg. no. 46,761-D, where it is credited to Sturgeon, W. (1824) 'Improved Electro Magnetic Apparatus', Trans. Royal Society of Arts, Manufactures, and Commerce, Vol.43, Plate 3, fig.13.
作者 William Sturgeon
授權許可
(重用此檔案)
Public domain - Author died 1850

授權條款

Public domain

本作品在其來源國以及其他著作權期限是作者逝世後70年或以下的國家與地區屬於公有領域


你必須增加美國公有領域標籤顯示為何這個作品在美國屬於公有領域。
此作品無已知的著作權限制,亦不受所有相關和鄰接的權利限制。

說明

添加單行說明來描述出檔案所代表的內容

在此檔案描寫的項目

描繪內容

檔案歷史

點選日期/時間以檢視該時間的檔案版本。

日期/時間縮⁠圖尺寸使用者備⁠註
目前2008年8月9日 (六) 20:24於 2008年8月9日 (六) 20:24 版本的縮圖422 × 600(32 KB)Chetvorno{{Information |Description={{en|Drawing of first Wikipedia:electromagnet invented in 1824 by British scientist William Sturgeon. It was made of 18 turns of copper wire on an iron core. This is Sturgeon's original drawing from his paper to the Britis

下列2個頁面有用到此檔案:

全域檔案使用狀況

以下其他 wiki 使用了這個檔案: