480 TRANSACTIONS OF THE AMERICAN INSTITUTE. 



feed-bar, which alternately raises and throws forward the feed, when it is 

 moved downwards and baek by the spring 24. The length of tlu; stitch is 

 graduated by the stitch-lever 27 acting on cone 26; this also regulates the 

 machine for " gathering," by raising the lever as high as possible — no 

 other alteration being required for that work. Fig. 5 is a view of the feed- 

 bar removed from the machine. In case of the feed being worn on the 

 hearing 20, the screw 21 will raise the top plate 18 to its original height. 

 Fig. 6 shows the operation of the needle 36 and the elliptic hook 5. The 

 hook is seen passing above the eye of the needle and carrying the loop 

 around the bobbin. The hook, by its elliptic motion, leaves the loop beyond 

 the centre of the bobbin, when it is drawn into the fabric by the hook in 

 taking the next loop. This hook forms the stitch without twisting or 

 untwisting the thread, and consequently with the least friction. Figs. 1 

 and 8 represent the large and small guides; the large guide is fastened 

 by the screw 44. When used for quilting, the screw 36 is loDsened, and 

 the lower part of the guide raised to admit the quilt, in passing under, to' 

 be guided by last row of stitching. Fig. 9 is the improved hemmer, sub- 

 stituted in the presser 48; it is also used for felling and turning edges of 

 every description. Fig. 10 is the braider. The braid is passed through 

 hole 13, when it is stitched as in ordinar^^ sewing with the aid of the opera- 

 tor. Fig. 11 is the adjustable binder. Nos. 9, 6, 4 are guides for the edge 

 of the binding 3, which are adjusted by 10, 6, 7. It is adapted to binding 

 of various widths, by moving 15 backward or forward, which is held by 

 the screw 16, More or less binding can be thrown on the upper or lower 

 side by adjusting the guides properly. 



The Copper Mines of Canada. 



Dr. R. P. Stevens: In prosecuting the geological survey in Canada 

 East — comprising parts of the counties of Sutton, Rome, Bolton, Ascot and 

 Shiptown — mines of copper were discovered, specimens of which are here 

 presented. Tliey cover an area of from three to five miles. The copper 

 lays in two great valleys. The ore is mostly found in limestone, so that 

 immense excavations have been made in the limestone — some, much larger 

 than this room. One mine of this rock has already realized from one mil- 

 lion to a million and a half of dollars. There are probably in Canada, now 

 being developed with promise of success, more than fifty copper mines. If 

 only half of them should be successful, they would be worth more than all 

 the other interests of Canada — not excluding the great fur trade of the 

 West. Another position in which this mineral is found is in the immense 

 slate rocks which abound in this locality. The Dr. here explained in detail 

 the different specimens of copper ore on the table. 



Human Strength. 



Dr. John B. Rich read the following extract : ' 



Dr. George Winship, the strong man of Boston, now raises daily the 

 extraordinary weight of twenty-six hundred pounds. His operating rooms 

 under the old Park street church, Boston, are daily thronged with the 

 curious as well as those who are desirous of learning the art of how to be 

 strong. In one corner of the room stands his famous lifting machine. This 

 consists of a solid framework of wood about seven feet in height, with a 



