ABSTRACT OF PROCEEDINGS. 



is greatly exaggerated, 

 lens. 



It is best observed by the aid of a hand 



M 



N. 



4' 11" 



4' If 



3' 3f" 



3'0" 



371 sq. in. 



243 sq. in. 



... 144 „ 



128 „ 



3-58 



2-58 



5-63 



4-09 



1-57 



1-59 



... -W 



-3° 



Mr. L. Uargrave exhibited two Soaring Kites M. and N. — 

 Two Soaring Kites. 

 Length 



Width 



Projected area of propeller ... 

 ,, „ end surfaces 



Total area, square feet 

 Weight, pounds 

 Pounds weight per square foot 

 Angle of propeller ... 



(1) The bed rock of this matter is the fact that the wind blow- 

 ing on the convex side of a soaring curve, causes a thrust on the 

 concave side in a direction to windward of the zenith. 



(2) The soaring curve pulls the plane part of the kite up against 

 the wind, resulting in a motion against the wind. This is the 

 converse of the act of pulling in the string of a kite to make it 

 come forward and down. 



(3) The soaring bird's wing may be divided into three triangles, 

 two of which soar, and one acts as a kite wrong side up. 



(4) A bird that is merely soaring by means of an upward trend 

 of wind may be known by the wing tips being turned up. 



(5) A bird that is truly soaring in horizontal or downward 

 blowing wind, may be known by the wing tips drooping. 



Prof. Liversidge, m.a., ll.d., f.r.s., exhibited and described 

 (1) some Maori net sinkers made of impure barytes (sp. gr. 4*03} 

 and of claystone? (sp. gr. 2*8) and some un worked concretionary 

 nodules of barytes, these had been obtained by Mr. John Webster 

 of Hokianga, New Zealand, from some kitchen middens in the 

 district. The Maoris had doubtless selected the barytes on account 

 of its great density ; its comparative softness allowed it to be 

 readily worked into shape and perforated. This is the only case, 

 known to the exhibitor, of barytes being used for this purpose. 



