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    "text" : "<table>\n  <tr><td align=right>θ:&nbsp;<td>camming angle\n  <tr><td align=right>f:&nbsp;<td>fall force\n  <tr><td align=right>φ:&nbsp;<td>crack flare angle\n  <tr><td align=right>μ:&nbsp;<td>minimum coefficient of friction\n  <tr><td align=right>f<sub>c</sub>:&nbsp;<td>cam force (per crack side)\n</table>\n",
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    "text" : "Force diagram for a cam in a<br>symmetrical vertically flaring crack",
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    "text" : "* Theoretical minimum coefficient of friction for cam to hold. Caveats from cam manufacturers: cam may grind soft rock surfaces into dust and skate out on that dust layer. (That is why Fat Cams exist.) Also, in a flare, if the cam loses contact with the rock and is pulled out fast enough, it may never reestablish contact.",
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