| 摘要 |
FIELD: T-squares. SUBSTANCE: inertia T-square has a spindle with rollers and a spiral mark installed on the rule and engageable with the scale on the casing. The rollers of the spindle installed on supports for engagement with and disengagement from the motion surface are mounted on the spindle axle for movement and attachment to it. In addition to the main mark, but with a reverse direction, marks on varicolored strips are made forming a vernier joint with the movable scales of the bands installed along the movement of the spiral marks for winding out and attachment. EFFECT: improved design. 3 dwgk
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