. Bell telephone magazine . o handle. The Laboratories experiments were further extended to de-termine the best kind of cement to use, the best mix and itsconsistency, and the effect of certain admixtures to insureproper plasticity over a sufficient period of time to comply withworking requirements in the field. Part of the Laboratories investigations and experiments wereconducted at their indoor laboratories in New York, and dur-ing the progress of development they also supervised certaintrial installations in the plants of operating companies. Thesefacilities, however, were inadequate to per
. Bell telephone magazine . o handle. The Laboratories experiments were further extended to de-termine the best kind of cement to use, the best mix and itsconsistency, and the effect of certain admixtures to insureproper plasticity over a sufficient period of time to comply withworking requirements in the field. Part of the Laboratories investigations and experiments wereconducted at their indoor laboratories in New York, and dur-ing the progress of development they also supervised certaintrial installations in the plants of operating companies. Thesefacilities, however, were inadequate to permit properly conduct-ing all of the experiments deemed necessary. In the first placeindoor laboratory methods as applied to underground conduit 221 BELL TELEPHONE QUARTERLY construction cannot be made to properly simulate field condi-tions. On the other hand, due to the pressure attendent uponwork in the field, where a large construction force is co-ordinat-ing its efforts in the interest of economy, there is not the oppor-.
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