This is a demonstration device showing two aspects of electric charge. When the conducting sphere atop the vertical stand is charged (e.g. by using a Leyden jar) the horizontal pinwheel device at the top begins to spin as charge is leaked from its…
This picture shows the electrical experimentation room in Reid Hall around 1900. The tangent galvanometer visible in the picture above had been moved and can be seen at the right. Just to the left of it is the Kelvin current balance still in the…
An example of the personal elements that were pulled from the copybook / math journal, this envelope was addressed to Nelson, though the contents and the sender of the note remain unclear.
An example of the personal elements that were pulled from the copybook / math journal, this envelope was addressed to Nelson, though the contents and the sender of the note remain unclear.
In Anwesenheit Adolf Hitlers und der Spitzen von Partei und Staat wurde Anhalts verstorbener Reichsstatthalter am 26. Oktober zu Dessau zu Grabe getragen. - Die Trauerfeier im Friedrich-Theater. Der Führer grüsst seiner Gauleiter. Die Beisetzung…
"The “Fountain in Vacuo” is a perfectly delightful and entertaining 19th century demonstration that is never done today. Volume 1 of Pike’s Illustrated Catalogue of Optical, Mathematical and Philosophical Instruments (New York, 1856) describes it,…
In 1844 Froment devised an electric motor that was one of the first used for industrial purposes. In his design, electromagnets are energized to attract iron bars mounted on a revolving cage. Once the iron bar is level with the electromagnet, the…
This scan is an image of the book's title page and previous page, which contains an engraving entitled The Four Representations of Mankind thatdepicts Europeans, Asians, Africans, and Native Americans.
NOT YET LOCATED.
The term “galvanometer” is in current use, naming an instrument which indicates the strength of an electric current. The Galvanoscope is an earlier instrument, which shows the presence of the current but gives only a rough…
berühmter evangelischer Theolog der Berliner Universität, hervorragender christlicher Dogmatiker und Kanzelredner, Inhaber des Adlerschilds des Deutschen Reichs, starb am 23. Oktober im Alter von 76 Jahren.
In General Order Number 9, General Robert E. Lee announces to the Army of Northern Virginia that the American Civil War has ended and that they are free to return home. This is the original document written in General Lee's hand.
Kommandierender General der Panzertruppen und Inspekteur der Kraftfahrkampftruppen und der Heeresmotorisierung, wurde mit Wirkung vom 1. November 1935 zum General der Panzertruppen befördert.
Glass, when stressed, shows the property of double refraction: light of differing polarization directions bends differently passing through the glass. When placed between crossed polarizers , bands of color may be seen, with the spacing of the bands…
Newspaper article of Virginia Governor John Letcher's response to the U. S. Secretary of War Simon Cameron's request for part of the Virginia militia to be sent to Washington, D.C. to serve in the Union army. In this reply, Governor Letcher refuses…