Rain Forest Vegetation Rain Forests are grouped into two major types: tropical and temperate. Most might say the main vegetation is trees, but rain forests have a vast amount of different kinds of vegetation.
Reply Contact. More details: The voes switch closes when there is high vacuum, when it closes the timing is advanced. So when you wack open the throttle, haul a load up hill or at idle when there is low vacuum, the timing is retarded.When you are cruising (and vacuum is high) the timing is advanced for better economy.eply Contact. More details: The voes switch closes when there is high vacuum, when it closes the timing is advanced. So when you wack open the throttle, haul a load up hill or at idle when there is low vacuum, the timing is retarded.
Flow and Tamper Switches. Flow switches and tamper switches are devices used on sprinkler systems. Flow switches detect water movement or drop in pressure, and activate alarms. Tamper switches detect when a sprinkler valve has been partially to fully closed and usually activates a trouble signal at the control, although some cities require them activate alarms. Check with your local fire dept for their requirements.