sluice box vs tub

sluice box

noun
  • A box with riffles along the bottom, used to trap heavier gold particles as water washes them and the other material along the box. 

tub

noun
  • A box or bucket in which coal or ore is sent up a shaft. 

  • A flat-bottomed vessel, of width similar to or greater than its height, used for storing or packing things, or for washing things in. 

  • A slow-moving craft. 

  • A bathtub. 

  • Any structure shaped like a tub, such as a certain old form of pulpit, a short broad boat, etc. 

  • A small cask. 

  • A corpulent or obese person. 

  • The contents or capacity of such a vessel. 

  • Any of various historically designated quantities of goods to be sold by the tub (butter, oysters, etc). 

verb
  • To bathe in a tub. 

  • To plant, set, or store in a tub. 

How often have the words sluice box and tub occurred in a corpus of books? (source: Google Ngram Viewer )