This paper primarily deals with the high tension insulators of present day as was noted by the author during his recent visit to the United States. Expert opinions of transmission specialists and leading manufacturers are the basis of this paper. Part of the contents was presented as a discussion of the paper on “Insulators in High Voltage Transmission” by Mr. W. A. Hillebrand. at the June meeting of the Tokio branch of the Institute.
The subject is presented according to the following headings:-
1. Materials for insulators.
2. Improvements in the pin type insulators.
3. Comparative study of typical suspension type insulators.
4. Improvements in the cap-and-pin type insulators.
5. Comparison of clevis joints and ball-socket joints.
6. Depreciation of insulators.
7. Methods of weeding out defective insulators.
8. Method used in changing defective insulators.
9. Protective methods used for insulators.
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