| The lure of underwater travel seems to have obsessed inventors almost as much as the wish to fly, but the first attempt to address practical problems did not come until the sixteenth century. In 1578 an Englishman called William Bourne wrote of a submersible boat in his book Inventions and Devices.
Although there is no evidence that Bourne built such a boat, he clearly grasped the essentials: a watertight hull, ballast tanks and a means of expelling the seawater from those tanks to return to the surface. He described a wooden hull, with leather bags in the bilges which would be filled with seawater through holes in the side of the boat, destroying its positive buoyancy. To return to the surface two screw presses would squeeze the water out again, restoring buoyancy. He also proposed a hollow mast to refresh the air supply. |
|
|
 Solar Flare Magnetic Fields and Plasmas
This volume is devoted to the dynamics and diagnostics of solar magnetic fields and plasmas in the Sun’s atmosphere. Five broad areas of current research in Solar Physics are presented: (1) New techniques for incorporating radiation transfer effects into three-dimensional magnetohydrodynamic models of the solar interior and atmosphere,... | | Return of the Grizzly: Sharing the Range with Yellowstone's Top Predator
The Yellowstone grizzly population has grown from an estimated 136 bears when first granted federal protection as a threatened species to as many as 1,000 grizzlies in a tri-state region today. No longer limited to remote wilderness areas, grizzlies now roam throughout the region—in state parks, school playgrounds, residential ... | | Unity 2D Game Development
2D games aren't just fun to play, with this book they're a blast to develop. That's because the guide takes you through every step of creating a fully featured platform game using Unity 4.3, easily and imaginatively.
Overview
-
Build a 2D game using the native 2D development support in Unity...
|
| | Semantic Web For Dummies (Computer/Tech)The Semantic Web community has a distinct feeling of manifest destiny. Here in the early part of the 21st century, the Web is still in its infancy (less than 20 years old), and the scope of unsolved digital data challenges is simply enormous. To many in the software industry, myself included, it seems inevitable that the next great Web revolution... | | Naked Vegas 5Naked? Admittedly, the title is an attention getter. It also
describes exactly what you’ll get: the information you need to
create compelling video with Vegas without fluff or filler to
super-size the book so it will stand out on the shelves. What
you’ll find in each chapter are step-by-step lessons that help... |
|
