Mechanisms — elevation gear

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Quadrant Catch Hand-gear (form B) diagram
Quadrant Catch Hand-Gear Form B: Ideal Reduction Ledger

Posted by Robbie Dickson on

Quadrant catch hand-gear form B explained — how the spring-loaded pawl locks elevation arcs on field guns and survey theodolites, with formulas and a worked...
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Quadrant Catch Hand-gear (form A) diagram
Quadrant Catch Hand-Gear Form A: Declared Arc-Index Ledger

Posted by Robbie Dickson on

Quadrant Catch Hand-gear Form A explained — how the toothed quadrant lever locks naval gun elevation, with diagrams, formulas and restoration examples.
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