The Art of turning might perhaps itself be classed among the Arts of Copying. All work which is executed on a mandril par takes in some measure of the irregularities section which ought to exist at every part can only be ensured by an equal accuracy in the mandril and its collar. Some very singular specimens of an Art of Copying not yet made public were brought from Paris a short time since. A watch-maker method by which he could take from the same copper plate impressions of different nal design. Four impressions of an Eagle were examined by a late artist equally disi tinguished for his skill and for the many me chanical contrivances with which he enrich ed his Art The largest was four times the superficial size of the smallest and no lines ponding lines in the others. There appeared to be a difference in the quantity of ink but none in the traces of the engraving. The processes by which this regular operation was executed have not been published but two conjectures were formed at the time which merit notice. It was supposed that the transferring the ink from the lines of a cop per plate to the surface of seme viscous fluid and also of transferring the impression from the fluid to paper. If this could be accom plished the Print would be exactly the same size as the copper from which it is derived ; but if the viscous fluid were contained in a vessel having the form of an inverted cone with a small aperture at the bottom the liquid might be lowered or raised in the ves sel by gradual abstraction or addition through to which the printing ink adhered would diminish or enlarge and in this altered state the impression might be retransferred to pa per. It must be admitted that this conjectural explanation is not without considerable dif ficulties for although the converse operation of taking an impression from a liquid surface has a parrallel in the Art of marbling paper the possibility of transferring the ink from the copper to the fluid requires to be proved. Another a
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