Recent Blogs
Roller Parallel Ruler Mechanism Explained: How It Works, Parts, Diagram and Marine Navigation Uses
How a Roller Parallel Ruler works, the geometry behind its tracking accuracy, and why marine navigators still use it on paper charts today.
Three-part Parallel Ruler: Arm-length Mismatch Comparison
Explore the equal-arm parallel-ruler arrangement and compare three entered length mismatches. Percentages are dimensional comparisons, not angular-error predictions.
Parallel Ruler (Form 6): Ideal Alternating Walk Sequence
Explore parallel-ruler motion. Calculate the components of one equal-link transfer and the total perpendicular advance for repeated transfers at a fixed angle.
Parallel Ruler (Form 5): Hiscox Slotted Crossed Bars
Explore Hiscox’s slotted parallel ruler with equal crossed bars. Calculate ruler separation, sliding-end span and center-to-end distance from bar length and angle.
Parallel Ruler (Form 4): Ideal Repeated-Line Transfer
Explore repeated transfers with an equal-link parallel ruler. Calculate perpendicular step size, full placement count, covered distance and final excess.
Parallel Ruler (Form 2): Hiscox Equal-Link Pivot Path
Explore Hiscox’s equal-link parallel ruler. Calculate longitudinal shift, perpendicular separation and circular pivot travel from link length and opening angle.
Parallel Ruler (Form 1): Exact Equal-Arm Translation
Explore an equal-arm parallel ruler. Calculate longitudinal shift, line separation, enclosed area and ideal parallelism from pivot spacing, arm length and angle.