. Bell telephone magazine . 7. Excavating \vith Compressed Air. 8. Mechanical Tamper. 9. Scraper Type Back Filler. 10. Drag Line Back Filler. 11. Tractor Plow Outfit. l> Lowering Wooden Manhole into Lowering Loading Coil Case into 14. l)ori!i,K Trailer Outkit. 15. Trench Rollers. 16. Splice Case for Tape Armored (ahle. 17. Laying Cable prom Caterpillar Trailer. 18. Arrangement of Cable in Loading Manhole. 19. Splice Covering for Cable in Fiber Conduit. 20. Concrete Post Marking the Location of Buried Cable. Installation of New Types of Buried Toll Cable under crossin
. Bell telephone magazine . 7. Excavating \vith Compressed Air. 8. Mechanical Tamper. 9. Scraper Type Back Filler. 10. Drag Line Back Filler. 11. Tractor Plow Outfit. l> Lowering Wooden Manhole into Lowering Loading Coil Case into 14. l)ori!i,K Trailer Outkit. 15. Trench Rollers. 16. Splice Case for Tape Armored (ahle. 17. Laying Cable prom Caterpillar Trailer. 18. Arrangement of Cable in Loading Manhole. 19. Splice Covering for Cable in Fiber Conduit. 20. Concrete Post Marking the Location of Buried Cable. Installation of New Types of Buried Toll Cable under crossing pipe lines, highway pavements, rail-roads, etc. The trench rollers are also used where softor sand}^ soil is encountered which would not supportthe tractor and trailer over the trench. Back-Filling Where the excavated soil is on one side of the trenchas in trenching machine operation, the drag line typeof back-filler is applicable. This machine rapidly pullsthe dirt into the trench, a scoop full at a time, as itmoves along the side opposite the spoil pile. A trench made by the plow has, of course, two smallspoil piles, one on each side of the trench. For thiscondition a back-filler of the scraper type is used. Tamping Where a trench is located alo
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Keywords: ., bookauthoramerican, bookcentury1900, bookdecade1920, bookyear1922
