#  Astrophysical Principles - Gravitation 

 



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### Ellipse Drawing Board

\[M | t | —\]  
Drawing stencil for blackboard use.

### Foucault Pendulum

\[L | t++ | ★★\]  
Plane of pendulum oscillation appears to change due to rotation of Earth.  
\[[In-Depth Description](/presentations/foucault-pendulum)\]

### Precession Globe

\[M | t | ★★\]  
Globe pivoted so north pole can precess.  
\[[In-Depth Description](/presentations/precession-globe)\]

### Moon Orbit Model

\[M | t | ★★\]  
Mechanical model of Earth-Moon orbit around Sun.  
\[[In-Depth Description](/presentations/moon-orbit-model)\]

### Cavendish Experiment

\[L | t++ | ★★★★\]  
Calculation of gravitational constant, with accompanying apparatus model.  
\[[In-Depth Description](/presentations/cavendish-experiment)\]

### Reversible (Kater's) Pendulum

\[M | t | ★★\]  
A physical pendulum with two adjustable knife edges for an accurate determination of "g".  
\[[In-Depth Description](/presentations/reversible-katers-pendulum)\]

### Newton's Apple

\[L | t++ | ★★★★\]  
Apple electronically released from platform; fall time given by special circuit and digital display.  
\[[In-Depth Description](/presentations/newtons-apple)\]

### Potential Well Orbiter

\[M | t | ★\]  
Orbital motion simulated by ball rolling on wooden potential well.  
\[[In-Depth Description](/presentations/potential-well-orbiter)\]

### Gravitational Field Surface

\[M | t | ★\]  
1m diameter rubber sheet acts as curved space for ball bearing masses.  
\[[In-Depth Description](/presentations/gravitational-field-surface)\]

### Gravitational Lens

\[M | t+ | ★★★\]  
Laser and plastic lens with curvature to simulate bending of light by massive object.  
\[[In-Depth Description](/presentations/gravitational-lens)\]

### Saddle Shape Universe

\[M | t | ★\]  
Curved space segment for open universe geometry.  
\[[In-Depth Description](/presentations/saddle-shape-universe)\]

### Spherical Blackboard 

\[M | t | ★★★\]  
1m black sphere to draw pretty non-Euclidean diagrams.  
\[[In-Depth Description](/presentations/spherical-blackboard)\]

### Contact Us

**Mailing Address**: Lecture Demonstration Services, Science Center, Rm B-08A, 1 Oxford Street, Cambridge, MA 02138  
**Campus Location**: Science Center B-08A | **Tel**: (617) 495-5824 | **Email**: scidemos-at-fas.harvard.edu