A change in any one of the three types of motion affects the other two. Imagine three lines running through an airplane and intersecting at right angles at the airplaneâs center of gravity. 1  Rotation around the front-to-back axis is called roll.  Rotation around the side-to-side axis is called pitch.
A system boiler heats your central heating system directly and produces hot water for your cylinder. A system boiler, just like a regular (conventional) boiler works on the principle of stored hot water.However, a system boiler differs from a regular boiler in some important respects.n example of a central heating and hot water system layout using a system boiler with an open-vented hot water cylinder. View our system boilers. An example of a central heating and hot water system layout using a system boiler with a pressurised unvented hot water cylinder. View our system boilers.
A Scotch marine boiler (or simply Scotch boiler) is a design of steam boiler best known for its use on ships.Sectional diagram of a wet back boiler. The general layout is that of a squat horizontal cylinder. One or more large cylindrical furnaces are in the lower part of the boiler shell.Above this is a large number of small-diameter fire-tubes. Gases and smoke from the furnace pass to the back of the boiler, then return through the small tubes and up and out of the chimney.he Scotch boiler is a fire-tube boiler, in that hot flue gases pass through tubes set within a tank of water. As such, it is a descendant of the earlier Lancashire boiler and like the Lancashire it uses multiple separate furnaces to give greater heating area for a given furnace capacity.