STILL MOBE ABOUT POWIB HALL.• Perhaps our readers iUnkttortli much written about Power Hall, and to continue to talk eaek day nHdttt the display in this department may be giving it mm than its share of attention. Bat this la net true, as all will bear testimony who hare bom alongIt la not ao much that yea see mach machinery aa it la that you aea represent at Ire machinery—that which repreaanta almost all the departments, and which is here the beat of its kind.The wonder is not ae fret to those who merely harry along amid a wilderness of pulleys, and bands and moving wheels, ss it Is to the person who stops and looks more closely at what is done.g A PLkNIB.Here la a long bar of iron,, about seven feet in length, securely fastened. It is moving back and forth slowly, steadily. The wheels are in motion, and about every minute a change occurs, as if some perron controlling its movements had suddenly touched a secret spring, and sent It back to the place of beginning. To an indifferent observer the bar looks like a part of the machine. But look a MUle more eloaeiy and it will be seen that a little tool securely fastened Is so arranged that as the iron passes, it is having a part of Its surface cut sway by this little Instrument. The chips of iron are softly turning to the right or left as readily ss half hardened putty is turned by the movement cf a knife. There Is hardly any noise.It does net acoompUh its task, as some perform their good works, by making a great noise about it, or as ambitious and impatient man endeavors to leap the performance of little deeds in his desire to do great ones. * Quietly, and by a chip at a time, It works its wonders, and converts the rough iron into a smooth surface that fits it tor a thousand purposes. This is a plane for working iron.