HINTS TO CORRESPONDENTS. nu attention will be paid thereto. This is for our information and not for publication. date of paper and page or number of question. Inquiries not answered in reasonable time should be repeated; correspondents will bear in mind that though we endeavor to reply to all either by letter or in this department each must take his turn. Used in our columns will be furnished with addresses of houses manufacturing or carrying the same. without remuneration. had at the office. Price 10 cents each. price. marked or labeled. when an electrical current is passed through relatively
HINTS TO CORRESPONDENTS. nu attention will be paid thereto. This is for our information and not for publication. date of paper and page or number of question. Inquiries not answered in reasonable time should be repeated; correspondents will bear in mind that though we endeavor to reply to all either by letter or in this department each must take his turn. Used in our columns will be furnished with addresses of houses manufacturing or carrying the same. without remuneration. had at the office. Price 10 cents each. price. marked or labeled. when an electrical current is passed through relatively to the weight of the coils? A. A 1:_Notes and Queries., scientific american, 1903-03-21
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