![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjpiJCt8jVMin1BClLfLdc77xcPkGerbN7ZTFr6CWSHrd21lR3qVV4tweTDW2PiKgc1sZJbuTQaVtObNrvqVTW0engJZLjw6dSlAVlqftx1NZGeEUXEa1jEfLqoKPBqMZmosU_Z-u46Lw/s320/stone.jpg)
Stone wheel in a trough (by Vincent Jones, CC-BY-SA)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjwCUsqLJ_klBYiWwkXDsiDV40WwPILvZanb_aLLJUL3mqpj-c8TO-gh-jfXrnOWc8hifcUuPCnQIWMSkg89Y7jbbpluasXb037fnAIQQILDGHRO-QsbT60rYh_XnF7GvUn5NTC5EFt7Q/s320/wagon.jpg)
Wagon wheel (by Richard Sonnen, CC-BY-NC-ND)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjm1ZdXQM_RsWNV1rvEWBQAytsiUlMIT96ZO4X-yDn8Xbi-WpnH58hoh-TNjUEs4vw82_CrsyUbZM67nNd-sNWS1ruZikh0clm48LF-TeskKbuSF0wywXYWWKJngdhCL_hc0i9abulrfw/s320/steamroller.jpg)
Steamroller (by Rog Frost, CC-BY-SA)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhL5VuRW3HC1zOBL2MW-OtGzkES143uVR2_miQnhJ8oK7izYu9l8-0abtg39Xqx71vCjjRAlS3nlOAGIunj64QhcX0ne6F1HgoZUTRi16uaWbMz_d8aA0ZsD8z3MwfDW1Ed2F2PGPyhKQ/s320/car.jpg)
Car wheel (by Mr T. in DC, CC-BY-ND)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjh4RNDS9gKXNi2pM-8AWeoPWCz-8UygBBsmp5kzzOYxyONTS7IJMFVu5F9PRaSMTDHzHsOFt5C50NmwNAIBsXeIajv2ocxky9w7g2lZAIarmhA1YnMT5Fns8Dz8RPzEkUYguwNttz0_Q/s320/bike.jpg)
Bicycle wheel (from Soil-Net, CC-BY-NC-SA)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgyDCV4kzhB7SZq8xlOySgw8fwXOHJw7rGEaXhwQWQSr5Qyz41koc7LShOdJo1KSC0RuiVt3iQCkYyOEZbuwrNpSdMsC_Ola4NbkY6AHL1J6xMj2ySk0ZahzWm74bXamBx6hUtl4FDMcQ/s320/bulldozer.jpg)
Bulldozer tread (by John Schilling, CC-BY-NC-ND)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhazq4K7KapPT9AEafY2DzwfJ4IzVA26hou0Q2pUMru-TaUw3QbTNEsfa5gThnnqA9XhHea8o0G87D8ha8QJ441WdGnDIgK6RtN97DO5YxblCvT5IdBB28coNfV70YmzJ4flpDdybEk1w/s320/eggbeater.jpg)
Eggbeater (by Candice Wouters, CC-BY-NC-ND)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgUa4QnXggPvf_LAW5PbV6SEyMAD0hFXkPY8hIU8wF_zZEPW-yMXIIbcSVns2aO7BUB0pNfGXBnq1Xfejnlonl_PedihuzmA4JJKUn6ustBw2ZytgswTgiiTHbVaO-Gbxw7LGzpMieUhw/s320/saw.jpg)
Table saw (by Patrick Fitzgerald, CC-BY)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEijX9K_suxfjDIWvJi81_bQj0gc0PWQPpr80sGzCdVFuzbb9eJfzIAg0rg5zqqVBLnN9DewfgLy4yVMYyVgPOTttuZoMu327HZ49lVh8IsXeAOmlOoiPkmjQjNFuBXeHrormlb9mAaZtg/s320/fortune.jpg)
Wheel of Fortune (by Paul Stack, CC-BY-ND)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEit7DrnrcBi0xLdc79H0lCmTNo1EkgDFthsIM2KHegpzU3S9YnmEYVSMKetv-OgccokhZ29PfZELCyEy_tiAScvtNX1R1kisXf_mDTT4X6ov9VnFWtK1aGTgSZLhTYKYcy8ppRNUOMqEA/s320/ferris.jpg)
Ferris wheel (by Josh McGinn, CC-BY-ND)