Recent Blogs
Proportion Compasses / Hyperbola Drawing: How the Mechanism Works, Parts, and Drafting Uses
How proportion compasses and hyperbola-drawing linkages work, with the geometry, real shop scenarios, and a worked example for pattern-makers and drafters.
Torsion Dynamometer Mechanism: How It Works, Diagram, Parts, Formula and Uses Explained
How a Torsion Dynamometer measures shaft power from twist angle, with formulas, a worked marine propulsion example, and design tradeoffs for engineers.
Tire Measure Counter Mechanism: How Measuring Wheels Convert Revolutions Into Distance
Tire Measure Counter explained: how a wheel-and-dial odometer measures distance, accuracy figures, calibration, and named uses in surveying and forestry.
Three Horse Whiffletrees Mechanism Explained: How the 2:1 Evener Splits Draft Load Across Three Horses
How a three horse whiffletree balances pull from three animals onto one load, with the lever ratio, worked example, and real farm and logging applications.
Tensile Testing Machine Mechanism: How It Works, Diagram, Parts, Formula, and Uses Explained
Tensile Testing Machine explained — how it pulls a specimen to failure, measures yield and ultimate strength, and why metallurgists rely on it for QC.
Tatham's Dynamometer Mechanism: How It Works, Diagram, Parts, Formula, and Uses Explained
Tatham's Dynamometer measures shaft power using a differential pulley and weighted lever. Learn the formula, calibration steps, and where workshops still use it.
Spring Cyclograph Mechanism Explained: Parts, Decaying Spiral Formula, Diagram and Worked Example
How a Spring Cyclograph draws decaying spirals and damped curves for draughtsmen, engineers, and ornament designers — geometry, formula, and a worked example.
Spirograph Mechanism Explained: Hypotrochoid and Epitrochoid Curves, Parts, Formula, and Uses
Spirograph explained — how the hypotrochoid gearing draws roulette curves, the math behind the patterns, and how draughtsmen and educators use them today.
Spherometer Mechanism Explained: How It Works, Parts, Diagram, Formula and Uses
A spherometer measures the radius of curvature of lenses, mirrors, and curved surfaces. Used by opticians and machinists for sub-micron accuracy.
Speed Indicator Mechanism Explained: How Centrifugal, Chronometric & Drag-Cup Tachometers Work
How a Speed Indicator measures shaft RPM and power output, with formulas, a worked dynamometer example, and real applications in engine testing and machine tools.
Slotted Parallel Ruler Mechanism Explained: How It Works, Parts, Diagram, and Navigation Uses
Slotted parallel ruler explained — how the slot-and-pin geometry keeps drawn lines parallel, with worked examples for draughting, marine navigation and shipwrights.
Self-registering Barometer Mechanism Explained: How a Barograph Records Atmospheric Pressure
How a self-registering barometer works, with formulas, a worked meteorological example, and tradeoffs vs aneroid and digital pressure loggers.
Self-recording Level Mechanism Explained: How It Works, Lever Amplification Diagram, Parts and Uses
Self-recording level explained — how the pen-and-drum mechanism captures continuous elevation data for surveying, dam monitoring, and rail track profiling.
Section Liner Mechanism: How the Pawl-and-Rack Indexing Works, Parts, Uses, and Hatching Formula
Section Liner explained — how draughtsmen use this drawing tool to hatch parallel section lines fast and consistently in mechanical and architectural drafting work.
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.
Reflecting Drawing Board Mechanism: How It Works, Optical Diagram, Parts and Uses Explained
How a Reflecting Drawing Board works — the half-silvered mirror trick draughtsmen used to trace 3D objects flat onto paper, with worked examples and tolerances.
Recording Pressure Gauge Mechanism Explained: Bourdon Tube Linkage, Chart Drive, and Diagram
How a recording pressure gauge works, with formulas, calibration tolerances, and real applications in steam plants, hydraulics, and pharmaceutical autoclaves.
Proportional Compasses Mechanism: How They Work, Parts, Ratio Formula & Uses Explained
Proportional Compasses scale drawings up or down with one slide adjustment. Learn the geometry, ratios, and real draughting uses from architects to model-makers.
Prony Brake Rule Explained: How a Friction Dynamometer Measures Shaft Torque, Parts & Formula
Measure shaft power with a Prony brake — how the friction dynamometer works, the torque formula, worked example, and design tradeoffs for engine test cells.
Prony Brake Mechanism Explained: How It Works, Diagram, Parts, Formula and Uses
Prony brake explained — how this friction dynamometer measures shaft power on engines, motors and turbines, with formula, worked example and field calibration tips.
Omni-telemeter Odontograph Mechanism Explained: Parts, Formula, and Gear-Tooth Layout Uses
The Omni-telemeter Odontograph is a draughting instrument for laying out gear teeth profiles. See how it works, formulas, and applications in horology and machine design.
Great Curve Delineator Mechanism: How It Works, Diagram, Parts, Formula and Uses
The Great Curve Delineator draws large-radius arcs without a centre point. Used by shipwrights, naval architects and pattern lofts. Geometry, formula, examples.
Centrifugal Speed Indicator Mechanism: How It Works, Parts, Diagram, Formula and Uses Explained
How a Centrifugal Speed Indicator measures shaft RPM using flyweight balance. Formula, worked example, and real applications in engines, turbines, and mills.
Webber Dynamometer Mechanism: How the Friction Brake Measures Shaft BHP, Parts and Formula
Webber dynamometer explained — how friction-brake absorption dynos measure shaft power, with formulas, worked example, and real workshop applications.
Van Winkle's Power Meter Mechanism Explained: Strap-Brake Dynamometer Diagram and Formula
Van Winkle's Power Meter measures shaft power on belt-driven machinery using a calibrated friction brake. Learn the formula, setup, and real workshop use.