. A treatise on the astrolabe is a medieval instruction manual on the astrolabe by Geoffrey Chaucer. It is notable for being written in prose, in English and for describing a scientific instrument. The treatise is considered the ”oldest work in English written upon an elaborate scientific instrument”.
Latitude Hooks and Azimuth Rings: How to Build and Use 18 Traditional Navigational ToolsInternational Marine/Ragged Mountain Press #ad - On the other hand, the sounding line is an important and practical tool for small-craft navigation, particularly in the absence of an electronic sounder. These 18 projects fall roughly into three categories: decorative, useful, and somewhere in between. Each of the devices discussed here--with simple, and each is worth reviving for its beauty, proven building instructions complemented by clear illustrations--has at one time or another been used for the practical business of navigation, historic value, or sheer usefulness.
Everything can be scratch-built using easily obtainable materials and tools, and each is true to the spirit and function of the original instrument. Latitude hooks and azimuth Rings is for people who like to work with their hands and who appreciate traditional nautical craftsmanship. Dennis fisher has designed these projects with an emphasis on simplicity and reasonable cost.
Latitude Hooks and Azimuth Rings: How to Build and Use 18 Traditional Navigational Tools #ad - You don't have to be the master of any craft to undertake any of these projects--from a simple kamal or latitude hook to the more complex pelorus or octant--just a careful and enthusiastic worker. Some, such as the astrolabe, are mainly for display. The cross-staff falls somewhere in between, equally at home in the den or the ditch kit.