PROCEEDINGS OF THE POLYTECHNIC ASSOCIATION. 365 



ing) necessary for putting a crop into the ground, there must be 

 a great saving in time and hibor, and the farmer is enabled to 

 finish his work at one operation. The machine, however, is only 

 calculated for use on lands free from large stones. 



It is the opinion of your committee that this machine is 

 another step in advance of the arts and sciences, in their appli- 

 ance toagriculture, and is well adapted to be recommended to the 

 favorable patronage of our farmers. 



JOHN P. VEEDER, 

 THOMAS D. STETSON, 

 LOUIS KOCH. 



Jfew subject — On motion by Mr. Dibben, the subject of 

 " Steam Guns " was selected for the next meeting. 



Adjourned to quarter before eight o'clock, on Thursday even- 

 ing, May 9th, 



American Institute, Polytechnic Association, ? 



May 9, 1861. S 

 Mr. Jireh Bull in the chair. 



AMERICAN TURBINE. 



Mr. Jonas Smith exhibited a model of the American turbine 

 waterwheel. (See report of Farmers' Club, for April 29.) One 

 of these now in operation, with a six foot head, and six foot 

 wheel, has a 28-horse power, costing about $400. 



Mr. Billings stated that there was a working model in opera- 

 tion in this city, and asked for a committee to examine it and 

 report upon its merits. 



The committee was appointed, consisting of Messrs. Johnson, 

 Dibben and Seely. 



OREIDE. 



Mr. Seely exhibited a specimen of the oreide from which cheap 

 jewelry is now made in large quantities. It consists merely of a 

 brass in which the zinc and copper are so proportioned as to 

 produce the color of gold ; the magnesia", sal-ammoniac and other 

 substances which are added, not being metallic, and, therefore, 

 not modifying the result. The jewelry is gilded, and when the 

 gilding is worn oif, it cannot fail to tarnish like any other brass. 



