Some of the most popular Pyrex patterns today include: 1  of 07. Butterprint or Amish. 2  of 07. Daisy. 3  of 07. Dot or New Dots. 4  of 07. Eyes. 5  of 07. Gooseberry. 6  of 07. Rainbow Stripes. 7  of 07. Snowflake.
The friction surface of a vented rotor consists of two metal discs held together with vanes of metal which creates tunnels that let the heat escape. We call those cooling vanes. With the solid rotor, the friction surface consists of only one metal disc. This greatly reduces its ability for cooling. It is a common misunderstanding that you can choose whether you get a solid or vented rotor, this is NOT true.
The three types of vents are: Parallel: The sound channel and the vent are parallel. This is. the most popular form of venting because feedback is minimized. Diagonal: This version intercepts the sound bore at an angle and can result in a greater tendency to feedback.