4. Geometrical instruments
  5. Straight-line light ray type
  6. Rod or target

John G. R. Francis

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Blue top setting device

Geometrical instruments – Indicator of direction of force traversing natural media – Level or plumb – terrestrial gravitation responsive
Patent

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Direct reading grade rod with a sliding scale

Geometrical instruments – Straight-line light ray type – Rod or target
Patent

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Perspective drawing machine

Geometrical instruments – Straightedge type – Base attached
Patent

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Saw guide with cut location indicator

Geometrical instruments – Gauge – Collocating
Patent

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Saw guide with cut location indicator

Geometrical instruments – Scriber – Parallel line
Patent

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Profile ID: LFUS-PAI-P-994389

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