If you want to download the messages on the Mac side, they're available in MP4 format. The Video Messages feature is available to all US and UK Skype users initially, with a rollout to other countries expected in the future. Update: Microsoft informs us that the Skype Video Messages feature is part of Skype Premium. After 20 free messages you'll have to subscribe to Skype Premium for $4.99 a month to continue using the feature. Update 2: It looks like users of Microsoft's operating system won't have to wait too long to join in.
In diesel engines, like those that Bay & Bay Transportation drivers are familiar with, engine braking is a little bit of a different scenario. A compression release brake, also commonly known as a âjake brake,â opens the exhaust valves at the top of the compression stroke, creating a loud noise similar to the firing of a gun.
But how do retarders work? The compression stroke is one part of an engine's four-cycle system. The intake and exhaust valves are closed as the piston moves up, compressing the air being forced into the brake cylinder. At the top of the stroke, fuel enters the very hot air, burning rapidly and pushing against the piston, which is on its way back down.