ey i Bibliography. 297 
is most complete. A full sized model was exhibited in the office show- 
ing the operation with clear water only. Upon agitating the dasher, 
the water appeared as if in intense ebullition. Another peculiarity be- 
longs to this churn worthy of note. In the common churn, the dasher 
has to be raised out of the cream at each stroke and plunged down 
with some force, and as this scatters the cream, it is necessary to cover 
the churn tightly and allow the dasher to play through a smal] hole in 
the centre of the cover; but in this atmospheric churn the dasher is 
and enable you to watch the operation. stron 
its simplicity, and as one of the inventors stated he could alter any 
co 
inventions had been patented, and many more made and presented to 
the office to effect the same rpose. In truth this invention at first 
Was not considered patentable; but after the exhibition of its actual 
operation by one of the inventors, a different view was adopted and a 
Palent ordered to issue. As atmospheric churns were not hew, t 
Inventor, and an exhibition of the operation and result of his invention. 
4 he patentability of an invention frequently turns upon a nice point, an 
Inventions the most novel are sometimes the most worthless, while agai 
a 
entor, demolish a whole laby- 
result by means so simple as 
ee Most to rob invention of its charms. Such means as one would sup- 
Pose should have been the first and not the last resort. Mingled with 
Stcoxn Sznrzs, Vol. XI, No. 82.—March, 1851. 38 
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