88 MECHANICS AND MANUFACTURES. 



improved patterns. Special care has been observed so to proportion 

 their parts as to secure the greatest strength of metal and durability of 

 the machines. Stock of superior quality only is used and the work- 

 manship is first-class in all respects. All their finished parts consist of 

 graceful curves and are entirely free from fussed up beads and sharp 

 corners, rivalling in these respects the. celebrated Whitworth Tools of 

 England. This Company has taken a long step in advance in the 

 improvement of these classes of tools. Their Lathes are nearly all 

 provided with both lateral and cross power friction feed, both of which 

 have new and very valuable features. Their Planers have many desir- 

 able improvements combined with an enormous amount of weight of 

 iron. Their Upright Drills are very convenient and have S. C. Wright's 

 Patent Friction Feed, which is one of the best inventions of this class 

 that we have ever seen. All of these tools are furnished with patent 

 self-oiling countershafts. The productions of this establishment should 

 be seen by all who contemplate purchasing in this line. 



Cbas. I). Moore & Co. of Lawrence, had on exhibition one of their 

 Revolving Blade Scroll Sawing Machines which is a novelty in its 

 class and apparently a very desirable improvement. This invention 

 rotates the blade of the saw perpendicularly to the surface of the table. 

 This is accomplished while the saw is reciprocating so as to obviate the 

 turning about of the piece of wood or other material while being 

 sawed, the saw itself being made to conform to the curvature of the 

 pattern instead of making the outline conform to the direction of the 

 saw. This machine will be found to be a desideratum in shops where 

 a lack of room prevents the desirable working of other kinds of Jig 

 Saws. This machine is got up in very excellent style, is very orna- 

 mental and added largely to the attractiveness of the Fair. 



The Burleigh Bock Drill, of which we have heard so much but 

 which we have not often had an opportunity of seeing at work, made a 

 very creditable exhibition of itself at this Fair where it was in full 

 operation. This is a Fitchburg invention which has made successful — 

 we had almost said possible — the great work now in progress at the 

 Hoosac Tunnel. This machine is convenient, easily handled, not lia- 

 ble to get out of order, and, by competent judges, js said to be in every 

 respect the most practical Drilling Machine ever invented. It will drill 

 from two to six inches per minute, according to the hardness of the 

 rock — striking from 250 to 500 blows per minute — and is worked 

 either by steam or compressed air. At the Hoosac Tunnel air is used, 

 which is conducted in flexible pipes and serves the double purpose of 

 working the drills and ventilating the Tunnel. One of these machines 

 is said to perform the labor of twenty men at one-third the expense. 

 A peculiarity of this machine is that it drills a round hole, 'wbereas 

 hand drill holes arc in form like an equilateral triangle with the corners 

 and sides slightly rounded. 



The Union Stone Co. of Boston, exhibited a large collection of their 

 Emery Wheels and Stones and Grinding Machines, a goodly number 

 of which, wo are pleased to learn, they disposed of in our midst, show- 

 ing that these productions were fully appreciated by our manufacturers. 



