AMERICAN INSTITUTE. 



199 



Then as the cotton planter will only require to buy the machin- 

 ery and hire a spinner, making surplus labor available which he 

 now has to attend the machinery, having already the locations, 

 the power and seed cotton. Seeing the wide difference between 

 the value of ginned cotton and spun yarn, we see no reason why 

 this improvement in the manufacture of yarns shall not be rapidly 

 adopted, and add a very important sum annually to the wealth 

 and resources of the country. [Jt silver medal awarded. 



MATHEMATICAL AND PHILOSOPHICAL INSTRUMENTS. 



Kline^s Patent Compass to overcome Local Attraction on 

 Ship- Board. 



Kline's Patent Compass Manufacturing Co., 92 Wall and 301 

 Pearl streets. New- York. 



REPORT OF THE JUDGES. 



These compasses were carefully examined and subjected to 

 severe tests. They are designed to overcome local attraction on 

 shipboard. In an ordinary ship's compass a very perceptible 

 deviation from the true inclination is caused by the neighborhood 

 of masses of iron. The deviation is proportional to the nearness 

 and the quantity of attractive matter. English vessels are sub- 

 jected to an expensive process to adjust and compensate for these 



