| 33 / | HD | GEOMETRICAL INSTRUMENTS |
| 300 | DF | INDICATOR OF DIRECTION OF FORCE TRAVERSING NATURAL MEDIA {23} |
| 365 | DF | .~ Level or plumb, terrestrial gravitation responsive {9} |
| 377 | DF | .~.~ Liquid type, upper surface utilizing {2} |
| 379 | DF | .~.~.~ Bubble {5} |
| 381 | | .~.~.~.~ Plural {2} |
| 382 | DF | .~.~.~.~.~> Coacting at an angle |
| 383 | DF | .~.~.~.~.~> Relatively adjustable |