πŸ“ Open-Access STEM Vector Library

30 Technical Vector Diagrams & Schematics

Empirical engineering blueprints, horology mechanics, and physics schematics rendered in scalable vector graphics (SVG). Free to license under Creative Commons CC-BY-4.0 with attribution.

Swiss Lever Escapement Geometry & Impulse Dynamics
#01 β€’ Horology & Mechanics

Swiss Lever Escapement Geometry & Impulse Dynamics

Lift Angle \theta = 52^\circ \quad \text{Impulse Arc} = 30^\circ

Detailed mechanical layout showing escape wheel impulse tooth, entry/exit pallet rubies, and roller jewel engagement.

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Balance Wheel Harmonic Oscillation & Hairspring Torque
#02 β€’ Horology & Mechanics

Balance Wheel Harmonic Oscillation & Hairspring Torque

T = 2\pi \sqrt{\frac{I}{k}}, \quad f = \frac{\text{BPH}}{7200}

Phase-space trajectory and restoring torque curves of the Glucydur balance wheel and Nivarox Breguet hairspring.

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Daniels Co-Axial Escapement Architecture
#03 β€’ Horology & Mechanics

Daniels Co-Axial Escapement Architecture

F_f = \mu N \approx 0 \quad \text{(Tangential Impulse)}

George Daniels co-axial escapement with twin escape wheels, radial impulse transmission, and zero sliding friction.

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Tourbillon 1-Minute Revolving Carriage Mechanics
#04 β€’ Horology & Mechanics

Tourbillon 1-Minute Revolving Carriage Mechanics

\oint \vec{g} \cdot d\vec{r} = 0 \quad \text{(Rate Vector Averaging)}

One-minute revolving cage mechanism canceling positional gravity errors across vertical positions (Crown Up/Down/Left/Right).

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Mainspring Barrel Torque Curve & Isochronism Plateau
#05 β€’ Horology & Mechanics

Mainspring Barrel Torque Curve & Isochronism Plateau

\tau(\theta) = G J \frac{\theta}{L} \quad \Delta R = \frac{d\tau}{dt}

Power reserve discharge curve showing Hooke's elastic plateau, high-torque winding zone, and terminal amplitude decay.

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Hydrostatic Archimedes Immersion Balance
#06 β€’ Precious Metals & Metallurgy

Hydrostatic Archimedes Immersion Balance

SG = \frac{W_{\text{air}}}{W_{\text{air}} - W_{\text{water}}} \quad \rho_{\text{alloy}} = SG \cdot 0.9982 \text{ g/cm}^3

Dual-weighing hydrostatic immersion setup for non-destructive density calculation and gold coin karat verification.

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Gold Karat Metallurgical Purity Spectrum
#07 β€’ Precious Metals & Metallurgy

Gold Karat Metallurgical Purity Spectrum

K = 24 \times \frac{m_{\text{Au}}}{m_{\text{total}}} \quad (\text{24K}=99.9\%, 22K=91.6\%, 18K=75.0\%, 14K=58.5\%)

Standard sovereign assay purity bands from 9 Karat (37.5%) up to 24 Karat 999.9 Fine Kilobars with specific gravities.

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Au-Ag-Cu Ternary Metallurgical Phase Diagram
#08 β€’ Precious Metals & Metallurgy

Au-Ag-Cu Ternary Metallurgical Phase Diagram

\%Au + \%Ag + \%Cu = 100\%

Gibbs isothermal ternary phase composition triangle showing yellow, rose, red, green, and white gold alloy regions.

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Sovereign Assay Hallmark Identification Anatomy
#09 β€’ Precious Metals & Metallurgy

Sovereign Assay Hallmark Identification Anatomy

\text{Millesimal Fineness: } 375, 585, 750, 916, 999

Deconstruction of official assay punch marks: Sponsor's mark, standard purity mark, assay office town mark, and date letter.

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Cupellation Fire Assay Thermal Separation Process
#10 β€’ Precious Metals & Metallurgy

Cupellation Fire Assay Thermal Separation Process

2\text{Pb} + \text{O}_2 \xrightarrow{950^\circ\text{C}} 2\text{PbO} \quad \text{(Magnesia Cupel Absorption)}

Thermal gravimetric fire assay workflow isolating pure gold/silver dorΓ© bead from base metal oxides in a bone-ash cupel.

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AISC Simply Supported W-Beam Center Point Deflection
#11 β€’ Structural Engineering

AISC Simply Supported W-Beam Center Point Deflection

\delta_{\text{max}} = \frac{P L^3}{48 E I_x} \le \frac{L}{360}

Elastic deflection curve and bending moment diagram for wide-flange structural steel beams under concentrated center loads.

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Cantilever Beam Under Uniformly Distributed Load (UDL)
#12 β€’ Structural Engineering

Cantilever Beam Under Uniformly Distributed Load (UDL)

M(x) = -\frac{w(L-x)^2}{2}, \quad \delta_{\text{max}} = \frac{w L^4}{8 E I}

Shear force diagram (SFD) and bending moment diagram (BMD) for cantilevered steel beams under uniform gravitational loading.

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Euler Critical Column Buckling Modes
#13 β€’ Structural Engineering

Euler Critical Column Buckling Modes

P_{\text{cr}} = \frac{\pi^2 E I}{(K L)^2} \quad (K = 1.0, 0.7, 0.5, 2.0)

Fundamental buckling wave shapes and critical load limits across pinned-pinned, fixed-pinned, fixed-fixed, and fixed-free boundary conditions.

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ASTM A992 Structural Steel Stress-Strain Curve
#14 β€’ Structural Engineering

ASTM A992 Structural Steel Stress-Strain Curve

E = \frac{\sigma}{\epsilon} = 29,000 \text{ ksi} (200 \text{ GPa}), \quad F_y = 50 \text{ ksi}, \quad F_u = 65 \text{ ksi}

Tensile stress-strain curve detailing proportional limit, yield plateau, strain hardening region, necking, and ultimate fracture.

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Pratt Truss Nodal Equilibrium Resolution
#15 β€’ Structural Engineering

Pratt Truss Nodal Equilibrium Resolution

\sum F_x = 0, \quad \sum F_y = 0 \quad (\text{Method of Joints})

Free-body force vector decomposition identifying tension (blue) and compression (red) structural truss web members.

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Hohmann Interplanetary Elliptical Transfer Orbit
#16 β€’ Planetary Science & Astrodynamics

Hohmann Interplanetary Elliptical Transfer Orbit

\Delta v_1 = \sqrt{\frac{\mu}{r_1}} \left( \sqrt{\frac{2 r_2}{r_1 + r_2}} - 1 \right), \quad a_{\text{trans}} = \frac{r_1 + r_2}{2}

Co-planar two-impulse orbital transfer trajectory between Earth and Mars circular orbits minimizing propellant $\Delta v$ expenditure.

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Earth-Sun Five Lagrange Equilibrium Points
#17 β€’ Planetary Science & Astrodynamics

Earth-Sun Five Lagrange Equilibrium Points

\nabla \Phi_{\text{eff}} = \vec{0} \quad (L_1, L_2, L_3, L_4, L_5)

Effective gravitational-centrifugal potential contours mapping stable Trojan equilateral points ($L_4/L_5$) and collinear libration portals.

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Planetary Roche Tidal Disruption Boundary
#18 β€’ Planetary Science & Astrodynamics

Planetary Roche Tidal Disruption Boundary

d = R_M \left( 2 \frac{\rho_M}{\rho_m} \right)^{1/3} \approx 2.44 R_M \left( \frac{\rho_M}{\rho_m} \right)^{1/3}

Fluid vs rigid satellite tidal disintegration limits explaining planetary ring system formation and lunar fragmentation.

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Kepler's Second Law Equal Area in Equal Time
#19 β€’ Planetary Science & Astrodynamics

Kepler's Second Law Equal Area in Equal Time

\frac{dA}{dt} = \frac{1}{2} r^2 \dot{\theta} = \frac{h}{2} = \text{constant}

Orbital sector sweep geometry demonstrating perihelion velocity acceleration and aphelion deceleration in eccentric orbits.

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Hyperbolic Gravity Assist Slingshot Maneuver
#20 β€’ Planetary Science & Astrodynamics

Hyperbolic Gravity Assist Slingshot Maneuver

\vec{v}_{\infty, \text{out}} = \vec{v}_{\infty, \text{in}} + 2 \vec{v}_{\text{planet}}

Heliocentric energy gain vector geometry during trailing-side planetary flyby trajectories (Voyager & Cassini style).

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Radiocarbon Carbon-14 Radioactive Beta Decay
#21 β€’ Paleontology & Geochronology

Radiocarbon Carbon-14 Radioactive Beta Decay

N(t) = N_0 e^{-\lambda t}, \quad t_{1/2} = 5,730 \text{ yr}, \quad \lambda = \frac{\ln 2}{t_{1/2}}

Decay curve of radioactive carbon-14 ($^{14}\text{C} \to {}^{14}\text{N}$) with half-life intervals and residual activity ratios.

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International Chronostratigraphic ICS Epoch Column
#22 β€’ Paleontology & Geochronology

International Chronostratigraphic ICS Epoch Column

\text{Eon} \to \text{Era} \to \text{Period} \to \text{Epoch} \to \text{Stage}

Global boundary stratotype section and point (GSSP 'Golden Spike') chronological hierarchy from Precambrian to Quaternary.

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Trilobite Schizochroal Eye Biconcave Calcite Optics
#23 β€’ Paleontology & Geochronology

Trilobite Schizochroal Eye Biconcave Calcite Optics

n_{\text{calcite}} = 1.658, \quad \text{Zero Spherical Aberration (Descartes Doublet)}

Optical doublet geometry in Phacopina trilobite compound lenses using birefringent optical calcite to cancel underwater distortion.

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Ammonite Septal Suture Morphological Evolution
#24 β€’ Paleontology & Geochronology

Ammonite Septal Suture Morphological Evolution

\text{Goniatitic (Devonian)} \to \text{Ceratitic (Triassic)} \to \text{Ammonitic (Cretaceous)}

Evolutionary progression of cephalopod internal shell chamber fluting increasing hydrostatic implosion resistance under deep-sea pressures.

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Potassium-Argon (40K/40Ar) Isochron Radiometric Dating
#25 β€’ Paleontology & Geochronology

Potassium-Argon (40K/40Ar) Isochron Radiometric Dating

t = \frac{1}{\lambda} \ln \left( 1 + \frac{^{40}\text{Ar}}{0.105 \cdot {}^{40}\text{K}} \right), \quad t_{1/2} = 1.25 \times 10^9 \text{ yr}

Radiometric age determination diagram dating volcanic tuff ash strata bounding early hominid fossil layers.

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Acoustic Cylindrical Pipe Standing Wave Harmonics
#26 β€’ Acoustics & Harmonics

Acoustic Cylindrical Pipe Standing Wave Harmonics

f_n = n \cdot \frac{v}{2 L} \quad (n = 1, 2, 3, 4, \dots)

Displacement and pressure standing wave nodes and antinodes for open cylindrical acoustic resonators from 1st to 4th harmonics.

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12-Tone Equal Temperament vs Just Intonation Intervals
#27 β€’ Acoustics & Harmonics

12-Tone Equal Temperament vs Just Intonation Intervals

f_n = f_0 \cdot 2^{n / 12}, \quad \Delta \text{cents} = 1200 \log_2 \left( \frac{f_{\text{12TET}}}{f_{\text{Just}}} \right)

Frequency ratio cent comparison chart illustrating pure integer harmonic intervals ($3:2, 4:3, 5:4$) versus tempered 100-cent steps.

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Lissajous Orthogonal Harmonic Phase Curves
#28 β€’ Acoustics & Harmonics

Lissajous Orthogonal Harmonic Phase Curves

x = A \sin(a t + \delta), \quad y = B \sin(b t) \quad (1:1, 1:2, 2:3, 3:4)

Harmonic oscilloscope orbital trajectories revealing phase difference $\delta$ and frequency ratios between orthogonal acoustic sinusoids.

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Fletcher-Munson Equal-Loudness Contours (Phons)
#29 β€’ Acoustics & Harmonics

Fletcher-Munson Equal-Loudness Contours (Phons)

L_p = 20 \log_{10}\left(\frac{p}{p_0}\right) \text{ dB SPL}, \quad p_0 = 20 \; \mu\text{Pa}

Human psychoacoustic frequency sensitivity curves illustrating low-frequency attenuation and 3-4 kHz ear canal resonance peaks.

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Doppler Acoustic Frequency Shift Wavefront Dynamics
#30 β€’ Acoustics & Harmonics

Doppler Acoustic Frequency Shift Wavefront Dynamics

f' = f_0 \left( \frac{c \pm v_r}{c \mp v_s} \right), \quad \text{Mach Angle } \sin \mu = \frac{c}{v}

Wavefront compression ahead of moving sound source and expansion behind, transitioning into supersonic Mach shock wave cone.

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