Added 3 months ago | 00:26:02 | 121 views
Determining the position of a star or other object in three-dimensional space is an important concept in astronomy. Finding stellar longitude (called right ascension) and latitude (declination) is easy enough, but it is much harder to fi...
Added 3 months ago | 00:21:45 | 100 views
The aim of this video is to introduce high school students to the engineering concept of road construction and to the reasons why problems might arise in road construction. Presentation of this concept is made more accessible to students...
Added 3 months ago | 00:25:36 | 113 views
This lesson is about the importance of friction in our lives. It discusses the meaning of friction as well as the different types of friction. The lesson attempts to downplay the misconception that many people have regarding friction’s h...
Added 3 months ago | 01:19:08 | 139 views
Prof. Robert C. Merton
Added 3 months ago | 01:20:52 | 132 views
Prof. Robert C. Merton
Added 3 months ago | 00:01:52 | 68 views
Model of a "tuck and seal" letterlocking format. The "tuck and seal" is one of the most common types of letterlocking formats to survive in Western letterwriting traditions. The letter becomes its own envelope by tucking one side of the ...
Added 3 months ago | 00:00:27 | 374 views
Letterlocking: Document in a Textile Bag, Italy. 1578. Was this once a locked document? Did the textile bag serve as an envelope and was once sewn shut? The original is found in the Vatican Secret Archives, Fondo Veneto, Sezione II, Con...
Added 3 months ago | 00:03:52 | 86 views
Queen Elizabeth I to Rafe Sadler: Triangle-shaped paper lock w/slit perpendicular to fore-edge. England 1584. This letterlocking technique has features found on the most secure historic formats: the paper lock is from the same letter it ...
Added 3 months ago | 00:04:45 | 421 views
Letterlocking: Blank margin lock. Model of the highest level of built-in security found in letterlocking since the paper lock remains attached to the actual letter it is securing shut. Sir Robert Harley, Misc 28, Letter 2 of Hry Howard ...
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