Scales protect the fish from its environment. They overlap like shingles on a roof so that the skin of the fish is not exposed. As a fish grows, their scales produce rings much like a tree-and that is one way scientists can tell how old a fish is.Most fish get extra protection from a layer of slime that covers their scales. This slime helps them move through the water better, and keeps pests off of the fish skin.s a fish grows, their scales produce rings much like a tree-and that is one way scientists can tell how old a fish is. Most fish get extra protection from a layer of slime that covers their scales. This slime helps them move through the water better, and keeps pests off of the fish skin.
Inside a Muffler. Located inside the muffler is a set of tubes. These tubes are designed to create reflected waves that interfere with each other or cancel each other out. Take a look at the inside of this muffler: The exhaust gases and the sound waves enter through the center tube.
The designer of a catalytic muffler has to observe all catalytic converter design considerations discussed above, such as robust, durable packaging or flow distribution issues. In addition, the catalyst muffler must provide the required noise attenuation performance.lder designs of catalytic converters included support rings or deep pockets in the clamshell stampings to prevent axial movement of the substrate within the can. In a properly designed converter, which utilizes intumescent mats of high holding pressures, such measures are not required.