16 BULLETIN 1447, U. S. DEPARTMENT OF AGRICULTURE 
TABLE 13.—Cost of cash repairs and labor maintenance on farm of tractors 
of different sizes, 1920-1922; 42 tractors, 1920; 45 tractors, 1921; 40 tractors, 
1922 
SSS 
Cash repairs Owner’s labor Other labor 
: Total 
Size of tractor re- Own- | Expense | Own- | Amount | Expense | Own- | Amount | Expense 
ports ers per ers used per per ers used per per 
report-| tractor | report-| tractor tractor | report-| tractor tractor 
ing | per year ing per year | per year} ing per year | per year 
Horsepower: - Number|Number| Dollars |Nuwmber| Days Dollars |Number| Days Dollars 
HL eas eae OH 25 23 41. 00 20 3 11. 95 9 2 8. 33 
2) 3) oe AS ae 17 17 107. 06 14 2 23. 07 6 8 31. 60 
DOs aed NA cee 10 10 311. 80 a 14 57. 43 5 23 100. 00 
AQ Deets ee 45 43 422. 16 24 17 74. 75 32 22 96. 16 
Oe sae shat seeceds 30 30 642. 73 1 22 95. 59 24 13 73. 05 
All sizes_____ 127 123 352. 16 86 13 55. 87 76 16 74. 23 
INSURANCE, DEPRECIATION, AND INTEREST 
The insurance, depreciation, and interest charges for tractors of 
different sizes are given in Table 14. A charge for insurance was 
reported 22 times, but only once for tractors of less than 40 horse- 
power. 
TABLE 14.—Cost of insurance, depreciation, and interest for tractors of different 
sizes, 1920-1922; 42 tractors, 1920; 45 tractors, 1921; 40 tractors, 1922 
Average per tractor per year 
Total - Owners 
Size of tractor reporting 
reports |. ‘2 
surance | Tnsurance pepe? Interest 
Horsepower: Number | Number | Dollars | Dollars | Dollars 
HN ee a ac erat ER Nia Se NS Peet, ee See 25 0 0 171 3 
FA i ni Te tee linea MD Se aR Se) As em en Nit No a carter ey | 17 1 53 561 163 
2 mete ee = eee pier he ae ore ar ee ae, Ch a ee 10 0 0 687 123 
A () ee ee ES aay eee eee 45 14 93 858 249 
[\) pS are ey ea ae epee Re ee RP Fase | 30 U 78 819 182 
AMSIZ6S2 22 SRS Sek Sa ae eee ae 127 22. 86 660 170 
Depreciation was computed from estimates of owners as to the 
value of tractors at the beginning and end of the year and is an 
average for tractors of different ages. In computing this charge the 
resale value of old tractors was not considered. 
An interest charge at the rate of 6 per cent was made against the 
average of the value of the tractor at the beginning and end of the 
rear. 
: The average first cost, years of useful life, and depreciation of 
tractors of different sizes that were purchased new is given in Table 
15. Tractors in this area are subjected to hard usage. They are 
used for very heavy work on rolling slopes, and are continually sub- 
jected to clouds of dust which sifts into the bearings and onto the 
track. The estimated average useful life for all tractors was 6.3 
years. Tractor studies made in other areas showed that the life 
of the tractor in New York was about 6 years? and in the winter- 
wheat States of Oklahoma, Kansas, and Nebraska about 6.8 years.® 
2 Cornell Agr. Exp. Sta. Bul. 405. 3U. S. Dept. Agr. Bul. 1202. 
BS saa 
