Animated Antique Posographe 4+
A 1920s mechanical marvel
Ace Hoffman
Designed for iPad
-
- Free
Screenshots
Description
Animated Kaufmann Posographe (a 1920s mechanical contraption for photographers)
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 Privacy
The developer, Ace Hoffman, has not provided details about its privacy practices and handling of data to Apple. For more information, see the developer’s privacy policy.
No Details Provided
The developer will be required to provide privacy details when they submit their next app update.
Information
- Provider
-
Ace Hoffman has identified itself as a trader for this app and confirmed that this product or service complies with European Union law.
- Address
- 2517 Via Esparto Carlsbad California 92010 United States
- Phone Number
- +1 7607207261
- rhoffman@animatedsoftware.com
- Size
- 31.1 MB
- Category
- Education
- Compatibility
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- iPhone
- Requires iOS 8.0 or later.
- iPad
- Requires iPadOS 8.0 or later.
- iPod touch
- Requires iOS 8.0 or later.
- Mac
- Requires macOS 11.0 or later and a Mac with Apple M1 chip or later.
- Apple Vision
- Requires visionOS 1.0 or later.
- Languages
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English, Czech, Danish, Dutch, Finnish, French, German, Greek, Hebrew, Indonesian, Italian, Japanese, Korean, Malay, Norwegian Bokmål, Polish, Portuguese, Russian, Simplified Chinese, Spanish, Swedish, Thai, Traditional Chinese, Turkish, Vietnamese
- Age Rating
- 4+
- Copyright
- © 2019 Animated Software Company
- Price
- Free