ARRANGEMENT OF A VINEGAR FACTORY. 69 



for ventilation. Further, simple means for the conveyance of 

 the raw materials and the finished product must be provided for 

 and means devised for regaining the acetic acid, with the vapors of 

 which the air in the manufacturing room is constantly saturated. 



For the maintenance of a uniform temperature in the work- 

 room, which should remain almost constant even in the coldest 

 season of the year and during abrupt changes in the outer tem- 

 perature, the walls should be of more than ordinary thickness 

 and the number of windows and doors sufficient only for the 

 necessary light and communication, and so arranged that 110 un- 

 intentional ventilation can occur. The windows and doors 

 should, therefore, be double, and the latter so placed that one can 

 be closed without opening the other. The walls and ceilings should 

 be plastered and preferably papered with stout packing paper. 



Asphaltum, being impermeable and also indifferent to the ac- 

 tion of acetic acid, is undoubtedly the best material for the floor 

 of the workroom, though it may also be constructed of large 

 slabs of sandstone with the joints filled in with asphaltum. 

 Cement floors can only be recommended provided they are im- 

 mediately after their construction coated with water-glass until 

 they cease to absorb it. In constructing the floor care must be 

 had to give it such an inclination that the entire surface can be 

 cleansed by a simple jet of water. If the heating channel is 

 conducted lengthwise through the workroom, gutters for the 

 rinsing water to run off must be arranged on both sides. 



The height of the room depends on that of the generators. 



Heating of the Workroom. 



Heating by a stove placed in the workroom itself can only bo 

 recommended for very small factories ; in larger ones a special 

 heating apparatus should always be provided. Where stoves 

 are used it is recommended to arrange them so that the fuel can 

 be supplied and the ashes removed from the outside, i. e., from a 

 room adjoining the actual workroom. In attending to the stoves 

 fine particles of ashes will unavoidably reach the air ; from the 

 latter they may get into the generators, and being soluble in 

 acetic acid may injure the vinegar ferment. 



For large factories a heating apparatus similar to the one shown 



