computation and application of regular and overtime wage rates conform to the requirements of § 7 (a) of the Fair Labor Standards Act of 1938, 52 Stat. 1060, 29 U. S. C. § 201 et seg.
Respondent is engaged in the production of oil and gas for interstate commerce and its employees admittedly are covered by the Act. Prior to October 24, 1938, the effective date of the Act, certain of respondent’s employees worked 8-, 10- and 12-hour daily shifts, or “tours,” and were paid a specified wage for each tour. These wages were in excess of the minimum required by the Act, though the number of tours per week would often cause an employee to work more than the maximum hours allowed by the Act without overtime pay being required.
In order to maintain the same wage levels after the Act became effective, respondent made new employment contracts with the employees in question whereby they received their wages under the so-called “Poxon” or split-day plan. This plan arbitrarily divided each regular tour into two parts for purposes of calculating and applying hourly wage rates. The first four hours of each 8-hour tour, the first five hours of each 10-hour tour and the first five hours of each 12-hour tour were assigned a specified hourly rate described as the “base or regular rate.” The remaining hours in each tour were treated as “overtime” and called for payment at one and one-half times the “base or regular rate.” The contracts then recited that the “base rate” set forth “shall never apply to more than 40 hours in any work week.”
These so-called “regular” and “overtime” hourly rates were calculated so as to insure that the total wages for each tour would continue the same as under the original contracts,1 thereby avoiding the necessity of increasing
1
Thus the rotary helpers employed by respondent formerly received $7 for each eight hour tour. Under the split-day plan, they received a “regular rate” of 70 cents an hour for the first four hours *39of each tour and an “overtime” rate of $1.05 for each of the remaining four hours. This totalled $7 for the tour.