No. 133.] 107 



It must be admitted that the constniction of this pump is sim~ 

 pie. A rotary piston, when so arranged as to require no pack- 

 ing, and not rubbing with its periphery on a stationary surface, 

 possesses undoubted advantages. We understand these pumps 

 are constructed much cheaper than ordinary pumps claiming the 

 same capacities. Our judges, at the 25th Fair of the American 

 Institute, reported fav^orably on Gwynne's pump, and recom- 

 mended it for low lifts. They are manufactured at the works of 

 the Union Power Company, 353 West 24th-streetj New-York 

 city. A. c. 



Aiken's Saw Sets. 



Mr. H. Aiken, of Franklin, N. H., exhibited, at our late fair, 

 specimens of his saw-sets, for which he received the award of a 

 silver medal. This instrument, wherever known, seems to have 

 met with very decided approbation, as possessing qualities supe- 

 rior to all others, although there are many in the market, and we 

 have confidence in stating that those from the hands of Mr. Aiken, 

 may be relied on as being made of the best materials and thoroughly 

 tested. Some idea of the importance of such an instrument may 

 be arrived at when we consider that there are over ninety differ- 

 ent kinds of saws now in daily use, in the hands of artizans, ap- 

 plied to wood-work ; it is probably true that the saw, in some form 

 or other, is more extensively used than any other mechanical im- 

 pliment, and all of them require the constant care and attention 

 of skillful workmen to be kept in order. We copy the following 

 from Mr. Aiken's circular. 



"The edges of the teeth at the extreme points in all saws, le- 

 come worn off by use, and require frequent repairing. This saw- 

 set will bend the teeth in the angle required, condense and refine 

 the steel , bring the points to an edge, and extend the teeth in length , 

 which saves a great portion of the labor usually wasted in filing, 

 and consequently saves the wear of files, wliich are expensive. 

 The great accuracy with which this saw-set operates, causes the 

 teeth to follow each other in a direct line, which makes the saw 

 cut smooth and greatly reduce the labor or power applied to 

 operate the saw.'- a. c. 



