Animated Antique Posographe 4+
Ace Hoffman
專為 iPad 設計
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- 免費
螢幕截圖
描述
The Kaufmann Posographe is a fascinating mechanical contraption which was used by photographers in the early 20th Century to set their exposure times. Back then exposures were measured in seconds, and everyone in the picture had to freeze ("pose") for the entire time. Film plates were expensive and difficult to handle, so do-overs were avoided as much as possible. Over 100,000 French versions of the Posographe were sold alone, as well as tens of thousands of English-language versions. (Although this program is in English, the far more common French Posographe is depicted.)
This animation was originally created based on an article in the Oughtred Society's bi-annual journal, Spring 2019 issue, and then the lead programmer purchased an antique Posographe in order to make more accurate measurements and higher resolution photographs, to check the placement of some hidden connections, and lastly, to test the accuracy of the model against an actual Posographe. It’s very close!
Kaufmann invented and patented several versions of the Posographe and a couple of other related mechanical contraptions. The mathematical theory behind how the Posographe works was conceived around the same time, and Kaufmann apparently had a number of correspondences with the mathematician who invented the theory. Although the theory is not explained here, the math behind the Posographe is illustrated with connecting lines, colored brass plates (or not, if you prefer!), circles indicating intersecting positions of the pieces, and various additional ways of exploring "under the hood."
This program has fairly extensive math operating in the background, so it's best to have lots of battery life if running the program while on a batteries, especially if you turn on the "auto-move" feature and simply watch it run -- which is a lot of fun to do, by the way!
If using a keyboard, the following keys are available:
+ = enlarge item under mouse
- = shrink item under mouse
arrow keys = move item under mouse
enter key = guide page
a = animate Posographe
s = snake
App 私隱
開發者Ace Hoffman並未向 Apple 提供其私隱慣例及資料處理方式的詳細資料。詳情請參閱開發者的私隱政策。
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資料
- 供應商
- Ace Hoffman
- 大小
- 31.1 MB
- 類別
- 教育
- 兼容性
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- iPhone
- 須使用 iOS 8.0 或以上版本。
- iPad
- 須使用 iPadOS 8.0 或以上版本。
- iPod touch
- 須使用 iOS 8.0 或以上版本。
- Mac
- 須使用 macOS 11.0 或以上版本及配備 Apple M1 或以上版本晶片的 Mac。
- Apple Vision
- 須使用 visionOS 1.0 或以上版本。
- 語言
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丹麥文、俄文、印尼文、土耳其文、巴克摩挪威文、希伯來文、希臘文、德文、意大利文、捷克文、日文、法文、波蘭文、泰文、瑞典文、簡體中文、繁體中文、芬蘭文、英文、荷蘭文、葡萄牙文、西班牙文、越南文、韓文、馬來文
- 年齡
- 4+
- Copyright
- © 2019 Animated Software Company
- 價格
- 免費