. Harper's young people . <;I,ASS FIGURE AGATK. directions, until in about a quarter ofan hour they are reduced to nearlyperfect spheres. An establishment with three suchmills can turn out over sixty thousandmarbles a week. This operation is forthe coarser kinds of stone making the finer grades they areafterward placed in revolving woodencasks in which are cylinders of hardstone, and the marbles, by constantly rubbing against oneanother and against the stone cylinders, become verysmooth. To give them a high polish the dust formed inthe lasi operation is taken out of the cask, whi
. Harper's young people . <;I,ASS FIGURE AGATK. directions, until in about a quarter ofan hour they are reduced to nearlyperfect spheres. An establishment with three suchmills can turn out over sixty thousandmarbles a week. This operation is forthe coarser kinds of stone making the finer grades they areafterward placed in revolving woodencasks in which are cylinders of hardstone, and the marbles, by constantly rubbing against oneanother and against the stone cylinders, become verysmooth. To give them a high polish the dust formed inthe lasi operation is taken out of the cask, which is then; charged with fine emery powder. The very highest andlast grade of polish is effected with putty powder. .Marhies thus produced areknown to the trade as polished gray mar-bles. They also arestained different colors,and are then known ascolored marbles, andare sold by the NewYork wholesale dealersat from seventy to eightycents per thousand. What the maker re-ceives for them I leaveyou to imagine, for theGerman w
Size: 1584px × 1578px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1870, bookpublishernewyo, bookyear1879
