The scales are set according to the chemist's weighing orders, and the material is fed into the scales from the hoppers. 弗兰克·刘易斯·戴尔.爱迪生的生平和发明.
When the sand is mixed it is dropped through holes in the floor into the hoppers, which deposit the sand on the bench convenient for the core-maker. 佚名.神奇的知识之书.
Coal cars are dumped into hoppers under the tracks and the coal carried to the top of the piles by conveyors. 佚名.神奇的知识之书.