An allowable cost is a cost that can be paid by your contract or grant. UCSD considers a cost to be allowable when it meets the following tests: 1  The cost is reasonable; it reflects what a prudent person might pay.
Why wasnât it built? The design proved too expensive and complex to realize in Tatlinâs day, and he only managed to complete a few wooden scale models. However, thereâs some evidence that a group called Tatlinâs Tower and the World is planning to build a full-scale version of the monument. Unfortunately, they only plan to build it in separate sections, which will be housed in different venues.
A fixed structure would only work if the wind was blowing in the right direction, so the post mill, which could be turned into the wind, was soon preferred. They were often sited high or built on a raised mound to catch more wind. A logical development by the end of the Middle Ages was the tower mill.