"[Left] Cook's Auger; [Right] Expanding Auger."-Whitney, 1902.
"[Left] Post-hole Auger; [Right] Earth-boring Auger."-Whitney, 1902.
!["[Left] Post-hole Auger; [Right] Earth-boring Auger."-Whitney, 1902.](https://etc.usf.edu/clipart/15600/15603/augers_15603_mth.gif)
!["[Left] Cook's Auger; [Right] Expanding Auger."-Whitney, 1902.](https://etc.usf.edu/clipart/15600/15601/augers_15601_mth.gif){kind=small}