Polytechnic Association Proceedings. 735 



CARPET-STRETCHER AND TACK-DRIVER. 



Mr. Harding also exhibited Brown's combined carpet-stretcher 

 and tack-driver. This simple implement was much admired by 

 the audience, who seemed to appreciate its usefulness, and the 

 ease with which any person, even a lady, and with no other assist- 

 ance, can stretch and tack a carpet with little or no fatigue. (For 

 description and illustration the reader, is referred to page 245 of 

 the present volume of the Amei^ican Artisan.) Mr. Harding is 

 sole agent for the sale of this implement for the New England 

 States. The same gentleman also exhibited a tack-extractor, which 

 accompanies the tack-driver, and b}' which the tacks can be extracted 

 from the floor as easil}^ and with the same celerity, as they are 

 driven. 



NEW, WINDOW SHADE. 



Mr. Grice exhibited an improved window curtain fixture, which 

 is so arranged that the curtain -will remain at any position, and will 

 roll up even. The principle is a combination of rolls, which con- 

 fine the curtain and hold it in its position. 



PREPARED EGG. 

 Mr. Boole exhibited some fresh compressed Qgg, made up in the 

 form of large wafers. These are not a substitute for egg, but are 

 the Qgg itself, with the aqueous portion extracted and then com- 

 pressed. It is intended to be used precisely as fresh eggs are. 



NEW GEARING. 



Dr. Warren Eowell, of New York city, exhibited his patent cog- 

 wheels. These wheels are formed with either five or seven teeth, 

 and are applicable to any mechanism where the working point or 

 pitch-line between the two wheels is to be often varied, as in rolling- 

 mills, etc. The wheels exhibited were designed for wringer-rolls, 

 and were composed of step-gears, with a ring between them. The 

 claims of superiority over other gears are the ring between the 

 steps, giving strength, reducing the number of teeth, and increas- 

 ing the pitch, and by placing the teeth of one set opposite the 

 spaces of another, thus making the motion continuous. Many 

 questions were asked respecting the gearing, and much curiosity 

 seemed to be elicited by its novelty. 



It was proposed that the subject of novelties at the fair be con- 

 tinued at the next meeting, and the Association adjourned for one 

 week. 



