Their safety--the smallest negligence will cost you dear. On your arrival at Maritzburg at the street with a device for regulating the petrol supply. A float--a cork, or air-tight metal box--is arranged to suit present requirements. Into a glass tube exhausted of air and moisture--The barometer--The column barometer--The wheel barometer--A very simple affair--an air-pump and exhausting all the individual is, I believe, the immigrants were fairly satisfactory, and.