| DCS # | DEMONSTRATION | REFERENCE | ABSTRACT |
|---|
| 1R20.00 | Tensile and Compressive Stress | | |
| 1R20.10 | breaking wire | PIRA 200 | Add weights to baling wire attached to the ceiling until the wire breaks. |
| 1R20.10 | breaking wire | 1R20.10 | Add heavy masses to a thin copper wire until the wire breaks. |
| 1R20.10 | breaking wire | MA-10 | Add weights to baling wire attached to the ceiling until the wire breaks. |
| 1R20.10 | breaking wire | M-63 | Contains several hints about stretching wires. |
| 1R20.11 | elastic limits | PIRA 1000 | |
| 1R20.11 | elastic limits | Disc 08-04 | Stretch springs of copper and brass. The copper spring remains extended. |
| 1R20.12 | breaking wire support | AJP 28(4),404 | Drill a hole axially up a 1/4" eye hook and solder the wire in. |
| 1R20.15 | Young's modulus | PIRA 1000 | |
| 1R20.15 | Young's modulus | Disc 08-05 | Hang weights from a wire. Use a laser and mirror optical lever to display the deflection. |
| 1R20.18 | Poisson's ratio | MA-11 | A rubber hose is stretched to show lateral contraction with increasing length. |
| 1R20.20 | bending beam | PIRA 1000 | |
| 1R20.20 | bending beam | 1R20.20 | Ten lbs. is hung from the center of a meter stick supported at the ends. Orient the meter stick on edge and then on the flat. |
| 1R20.20 | rectangular bar under stress | 18-1.5 | A rectangular cross section bar is loaded in the middle while resting on narrow and broad faces. |
| 1R20.20 | bending the meter stick | M-66 | Some techniques for making the amount of bending visible to the class. |
| 1R20.20 | bending beams | Disc 08-06 | Hang weights at the ends of extended beams. Use beams of different lengths and cross sections. |
| 1R20.25 | sagging board
| PIRA 1000 | |
| 1R20.25 | sagging board | 1R20.25 | Place the ends of a thin board on blocks, then add mass to the center. |
| 1R20.27 | aluminum/steel elasticity paradox | TPT 28(6),416 | Copper and brass rods sag different amounts under their own weight but steel and aluminum do not. |
| 1R20.31 | stretch a hole | 18-1.3 | Holes arranged circle in a rubber sheet deform into an ellipse when stretched. |
| 1R20.32 | deformation under stress | M-67 | A pattern is painted on a sheet of rubber and deformed by pulling on opposite sides. |
| 1R20.38 | stress on a brass ring | 18-1.7 | A strain gauge bridge is used to measure the forces required to deform a brass ring. Diagram. Construction details. |
| 1R20.39 | squeeze the bottle | TPT 17(9),595 | Fill a whisky flask with a stopper and a small bore tube. Squeeze the bottle and watch the colored water rise in the tube. |
| 1R20.40 | buckling tubes | PIRA 1000 | |
| 1R20.60 | Bologna bottles | PIRA 1000 | |
| 1R20.60 | bologna bottles | M-19j.2 | Carborundum and bologna bottles. |
| 1R20.60 | bologna bottle | Disc 08-08 | Pound a nail with a Bologna bottle, then add a carborundum crystal to shatter the bottle. |
| 1R20.70 | Prince Rupert's drops | PIRA 1000 | |
| 1R20.70 | Prince Rupert's drops | MA-6 | Prince Rupert's drops. |
| 1R20.70 | Prince Rupert's drops | H-26 | Drops of glass cooled quickly can be hit with a hammer but shatter when the tip is broken off. |
| 1R20.70 | Prince Rupert's drops | M-19j.3 | Prince Rupert's drops. |