232 Proceedings of Indiana Academy of Science 



and bottom of the cylinder. These have been found to hold the sheets 

 more snugly to the cylinder in most cases than does the bar. The 

 recording pens are then set to continue the graphs on the old sheet 

 and when it is finished they pass on to the new sheet in their proper 

 respective positions. When the attendant returns, the old record sheet 

 is removed and the new one is left in place for records until the next 

 regular time for change. 



By actual test with the record sheets thus arranged and snugly 

 adjusted to the cylinder, the acceleration caused by the extra thickness 

 of paper due to the folding' of the old record sheet, was found to be 

 .s<?arcely, if at all perceptible even for the accumulation of a period of 

 three days. 



