Organ Pipes with Unusual Shapes
   This collection of organ pipes with curiously-shaped resonators is at the University of Toronto. 

   The L-shaped pipe in the foreground is one of a pair, one bent and one straight, that give the same sound. They are catalogue number 100 in the 1889 Koenig catalogue, and cost 18 francs.

   The two triangular pipes are "two stopped triangular prismatic pipes ... 
22 francs"; they are catalogue number 102.

   The three remaining pipes are from the set of "four stopped pipes, tetrahedral, cubical, cylindrical and spherical, having equal volumes ... 50 francs" (Catalogue number 110)

   This is one half of catalogue number 101, "two stopped cubical pipes... 18 francs". The accompanying pipe had twice the dimensions and spoke at half the frequency. This pipe is at the University of Toronto.
   Item number 111 in the 1889 Koenig catalogue is a set of "three open pipes, of the same length and volume, one prismatic [straight-sided] and the other conical... 30 francs." 

   These two pipes are in the collection at the University of Toronto, and the third pipe, undistinguishable from other ordinary organ pipes, is probably stored elsewhere. All three pipes should give the same frequency, but probably have different overtone structures. 

   These circular organ pipes are at Toronto (left) and Harvard (right); they are catalogue number 107 in the 1889 Koenig catalogue, and cost 28 francs (about $5.75). The catalogue lists it as "a circular pipe giving the sounds 1, 3, 5." That is, it acts like closed a pipe, giving only odd harmonics. However, the slider can be used to close the pipe at the middle, giving a node at that point.

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