Trans. Wis. Acad., Vol. XV. 
Plate XXXY. 
Curve showing relative numbers of watch mainsprings broken during the vari¬ 
ous months of the year. 
The numbers for each month, based upon records covering the decade from 
June 10, 1893, to June 10, 1903, are as follows: 
January, 37. 
February, 36. 
March, 51. 
April, 46. 
May, 89. 
June, 88. 
July, 94. 
August, 65. 
September, 67. 
October, 55. 
November, 35. 
December, 30. 
