APPENDIX II 



Cartago Weather Records, May 8, 1909-MAY 5, 1910 



Our temperature records at Cartago were obtained from a self-register- 

 ing, mercurial, combined maximum and minimum thermometer, without 

 any maker's name attached, bearing the legend "Made in Germany" on 

 its wooden support. The instrument was kept on the outer surface of a 

 solid wooden shutter inside of the glass casement window sashes. The 

 pane of glass immediately opposite the thermometer had been removed 

 and its place occupied by a fine metallic wire netting. The window faced 

 the east. In line with it, at the opposite end of the room, was a door com- 

 municating with a patio; over the door was a transom, always open, al- 

 though covered with mosquito netting. There was therefore a more or 

 less continuously circulating current of air through the room and over 

 the thermometer. The shutter to which the thermometer was attached 

 was usually opened into the room. The instrument rarely, if ever, was 

 exposed to the direct rays of the sun. 



Thanks to the officials of the U. S. Weather Bureau at Philadelphia 

 our instrument was compared with standard maximum and minimum 

 thermometers for seven consecutive days in May, 1910, with the follow- 

 ing results: 



May 8. Rain from 4.30 p. m., at times heavy. 



" 9. Rain, 10.30 a. m., 2.30 p. m. and later, sometimes heavy. 



