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BELL SYSTEM TECHNICAL JOURNAL 



case of this kind, the gang is ordinarily located on a job from one- 

 half day to three or four days, and since the power equipment on a 

 truck would be of no value in connection with placing a cable on the 

 rear walls of buildings, for instance, it is more economical to serve 

 this gang by means of a trailer. 



This light type of trailer contains sufficient space for carrying all 

 the necessary miscellaneous tools and materials required in connec- 

 tion with block work and the compartments into which it is divided 

 are such that these articles can be arranged in an orderly and readily 

 accessible manner, thus making for increased efficiency in executing 

 the work. 



Concrete Mixers 



In connection with the construction of underground conduit and 

 particularly in the work of building concrete manholes, which are 

 now being employed to a rather large extent, it is essential that con- 

 crete mixers be available which will be especially adapted to telephone 

 work. Some of the requirements of this service are that the outfit 

 be of light weight, compact, embody maximum portability, and be 

 reliable in operation. The failure of a mixer on a telephone job may 

 seriously handicap the operations of a large gang of men. 



Fig. 13 shows a commercial type of mixer which has been modified 



Fig. 13 — Concrete Mixer Adapted to Meet Telephone Construction Requirement 



