Screwing on the bit. Hole through which mud is forced from the mud hog may be seen in the bit. Oil well, Kilgore, Texas by… https://www.rawpixel.com/image/12171022/image-hand-person-artFree Image from public domain license[Untitled photo, possibly related to: Putting empty boxes aboard fishing boat that is heading for the fishing grounds… https://www.rawpixel.com/image/12173229/image-person-art-skyFree Image from public domain license[Untitled photo, possibly related to: Front porch of sharecropper cabin, Southeast Missouri Farms] by Russell Lee https://www.rawpixel.com/image/12168271/image-art-vintage-woodFree Image from public domain licenseActivity at oil well; man on lengths of traveling block will be pulled up to the crown block at top of derrick, Kilgore… https://www.rawpixel.com/image/12171009/image-person-art-skyFree Image from public domain license[Untitled photo, possibly related to: Oil drillers talking with bits in front of them and drilling equipment in background… https://www.rawpixel.com/image/12170968/image-background-person-artFree Image from public domain licenseEnclosed well and chain pump on porch of ranch house near Spur, Texas by Russell Lee https://www.rawpixel.com/image/12168899/image-art-vintage-public-domainFree Image from public domain license