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Additional Notes on Rain and Snow Gauges, Winter 1810

From Daily Record, 1 November 1802-25 May 1826 (Massachusetts Historical Society).

In Jefferson’s hand in available spaces in margin alongside entries for January-February 1810; he used diagonal strokes to cancel sections of these notes.

lesser rain gage broke Mar. 19. 10.

< .1 =.02437  
  .2 =.0487  
  .3 =.0731  
  .4 =.0975  
  .5 =.1218  
  .6 =.1462  
  .7 =.1706  
  .8 =.195  
  .9 =.2193 >

 

greater rain gages

.1 =.0094
.2 =.0188
.3 =.0282
.4 =.0376
.5 =.047
.6 =.0564
.7 =.0658
.8 =.0752
.9 =.0846

 

lesser rain gage. new.

< .1 =.02617  
  .2 =.05234  
  .3 =.07851  
  .4 =.10468  
  .5 =.13085  
  .6 =.15702  
  .7 =.18319  
  .8 =.20936  
  .9 =.23553 >

<the area of the snow gage is exactly double the rain gage. consequently snow taken up in that, melted, and measured in rain gage shows double>

 

the area of the snow gage is to that of rain-gage as 1. to .426

depth in rain gage

depth in snow gage

1. =.426
2. =.852
3. =1.278
4. =1.704
5. =2.13
6. =2.556
7. =2.982
8. =3.408
9. =3.834

 

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