Tallow 2810/00/500

Today's prudent mariner still carries a leadline in his or her boat. It never needs batteries and never needs to be recalibrated, making it an extremely reliable tool. Filling this space with something sticky, such as tallow is called "arming the lead" and is used to bring up bottom samples, such as sand, gravel, or mud to show what was on the sea floor in that spot.