Proceedings of tub Polytechnic Association. 999 



gutter is strapped tiglitlj about tlie neck, at the extreme lower part 

 of the hair, catches any water that ma}- escape from the apparatus. 

 A flexil>le tube is appended, by which the water may be carried off 

 to the sink, so that the person will have no occasion to leave the seat 

 during the entire operation of ghampooning, or even remove his 

 neck-tie. The flexible rim which adjusts the appaartus to the head 

 makes this device perfectly practical. The price of the machine is 

 twenty dollars. Those who had submitted to the cleansing opera- 

 tion of this apparatus had expressed themselves pleased with the 

 manner in which the work was done. 



Planeometer. 



Mr. C. D. Anderson exhibited and explained Amsler's planeome- 

 ter, for calculating the area of irregular figures, designed for engineers 

 generally, and used much for measuring the area of indicator dia- 

 grams of steam engines. One arm of the instrument, which has a 

 graduated scale, is moved along the outline of the diagram, and the 

 area is multiplied by a constant. Tlie diagram recoa-ds the revolu- 

 tions of the wheel. The instrument gives more accurate results than 

 can be arrived at by human calculation. It is small enough to 

 be carried in the pocket, and can be purchased in Europe for less than 

 100 frances. For a complete description of the theory and practical 

 operation of the planeometer, the reader is referred to the voluminous 

 and valuable reports recently made bj F. A. P. Barnard, LL. D., 

 United States Commissioner to the Paris International Exposition. 



Mr. C. E. Emery said that by this instrument there is no guessing 

 as with the usual method. Mr. Emery here made on the blackboard 

 diagrams of indicator cards, and showed the advantages of this 

 instrument over mental calculation. 



KoTAKY Dynamometer. 



Mr. Charles Neer exkibited his dynamometer. The instrument 

 shows the true amount of power used by any machinery to which it 

 is attached, or the capacity of any engine, water-wheel or other 

 motor, and can be easily moved from shaft to shaft to determine sepa- 

 rate parts. It has been applied to machinery in operation at the 

 exhibitions of the American Institute, and has met with very general 

 approval. 



The Association resumed the very interesting discussion which had 

 already occupied a part of several evenings, on 



