The Fire Brick D130 Instruction Booklet page 34

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3Q: COURSE 9
Lay Dome Course 10.
This row is made up of Type 2 bricks.
Cleaning Tip - see update #2 on Page 7.
3R: COURSE 10
Lay Dome Course 11.
This row is made up of Type 2 bricks only.
Cleaning Tip - see update #2 on Page 7.
3S: COURSE 11
Lay Dome Course 11.
This row is made up of Type 2 & Type 3 bricks in an
alternating pattern.
Cleaning Tip - see update #2 on Page 7.
3T: COURSE 12
Lay Dome Course 12.
This row is made up of Type 3 bricks only.
Cleaning Tip - see update #2 on Page 7.
3. Building the Dome