EliECTROMAGNETTC ITXTT OF ELECTRICITY TO THE ELECTROSTATIC LYTT. 017 
C 
7_ r -yal 
and if y„, yi are the values of y corresponding to the speeds nj,, tlien 
Hence we see that we may take as the corresponding uncorrected value of y„ the 
value yb'tiahh, if we apply to this the correction 1 — ii^stead of the correction 
1 — this is what we have done in compiling this table, and this column 
contains the values of yiHaj'^H. 
Column 11 gives the temperature of the box from which the resistance was taken. 
The temperature of the other two boxes are. assumed to be the same. Since they 
were always on the same table as the y box, and the temperature of this box varied 
very little, this assumption will not lead to any serious error. 
Column 12. “ Correction to 16° for resistances” from the formula 
we see that if we take the temperature coefficients to be the same for the three 
resistances and equal to ‘0003, then w'e may throw all the effect of the variation on 
y if for each degree above 16 we suhtract from y '0003 y. In the first and third sets 
this amounts to ‘82 ohm for each degree, in the second to 1 ohm per degree. 
Column 13. “Correction to 21 beats per minute.” The auxiliary fork always 
made rather more than 21 beats per minute with the standard. When making 21 
beats the speed of the auxiliary fork is 127‘7545 complete vibrations per second, and 
1 additional beat per minute indicates a diminution in the speed in the ratio 
1 ~ t ~ 2 8^x 6 0 fo 1. Since we wish to treat the observations as if the speed were 
constant wn must for each additional beat increase y in the ratio 1 + C 
i.e., in the first and third set observations we must add ‘36 ohm to y, and in the 
second set ‘43 ohm. 
Column 14. “ Correction to 16° for fork.” The fork has a temperature coefficient 
of - -00011, so that if we regard the speed as constant we must increase y in the 
proportion 1‘00011 to 1 for each degree the temperature of the fork exceeds 16° C. 
In the first and third sets this amounts to ‘30, and in the second set to ‘36 ohm for 
each degree of excess of temperature above 16° C. 
Column 15. “Correction to nC = ylh^.” We see from equation (7), page 606, 
that this is only an approximation to the correct value for wC, which is 
MDCCCXC.-A. 4 K 
