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Centratores solidi rigidi fabricantur utentes aluminii vel ferri materias. Quia diameter minor quam putridum est, solidi rigidi centrales non tam efficaces sunt quam arcus vere centrales in puteis verticalibus. Sed sunt aspera et bene opera deviantes.
Firmi centrales rigidi praesto sunt cum vanes & scutulis rectis vel spiralibus. Et potest esse longitudo regularis vel brevis.
4-1/2' ad 20' normae magnitudinis et servitii nativus auxilium invenis optimam solidam rigidorum centralium olei et gasi inceptis coagmentatis.
| Magnitudo (in.) | Intus Diameter (mm) | Altitudo (mm) | Summa altitudo (mm) | Maximilianus. Extra Diameter (mm) |
| 5' 6-1/2' | 128-131 | 110 | 650 | 175 |
| 5' 6-1/4' | 130-132 | 110 | 650 | 170 |
| 5' 12-1/4' | 128-131 | 105 | 690 | 330 |
| 5' 20'. | 128-131 | 105 | 720 | 535 |
| 5-1/2' 7' | 142-148 | 55 | 650 | 215 |
| 5-1/2' 8-1/2'. | 142-148 | 55 | 650 | 225 |
| 5-1/2' 8-1/2'. | 142-148 | 110 | 650 | 225 |
| 6' 8-1/2' | 156-158 | 55 | 650 | 235 |
| 7' 8-1/2' | 181-186 | 55 | 650 | 235 |
| 7' 8-1/2' | 181-186 | 110 | 650 | 235 |
| 7' 9-5/8' | 181-186 | 55 | 650 | 255 |
| 7' 9-5/8' | 181-186 | 110 | 650 | 255 |
| 7-5/8' 9-1/2' | 196–200 | 110 | 650 | 250 |
| 7-5/8' 9-5/8' | 197-201 | 55 | 650 | 275 |
| 7-5/8' 12-1/4' | 197-201 | 55 | 650 | 275 |
| 8-5/8' 12-1/4' | 223-228 | 55 | 650 | 330 |
| 9-5/8' 12-1/4' | 250-255 | 55 | 650 | 330 |
| 9-5/8' 12-1/4' | 250-255 | 110 | 650 | 330 |
| 10-3/4' ×12-1/4' | 274-276 | 55 | 650 | 330 |
| 10-3/4' ×12-1/4' | 274-276 | 110 | 650 | 330 |
| 17-1/2'. | 342-347 | 55 | 650 | 450 |
| 17-1/2'. | 342-347 | 110 | 650 | 450 |
| 18-5/8' 24' | 476 | 55 | 600 | 610 |
| 20' 26'. | 510 | 55 | 600 | 660 |