of the hand and be operated by the thumb number of threads in the form of tape upon Prime Movers and Their Accessories. be adjusted into full register or partially out Railways and Their Accessories. Pertaining to Vehicles. HINTS TO CORRESPONDENTS. no attention will be paid thereto. This is for our information and not aor publication. References to former articles or answers should give date of paper and page or number of question. Inquiries not answered in reasonable time should be repeated; correspondents will bear in mind that some answers require not a little research and though we endeavor to reply to all either by letter or in this department each must take his turn. Buyers wishing to purchase any article not adver tised in our columns will be furnished with addresses of houses manufacturing or carrying the same. rather than general interest cannot be expected without remuneration. Scientific American Supplements referred to may be had at the office. Price 10 cents each. Books referred ta promptly supplied on receipt of price. Minerals sent for examination should be distinctly marked or labeled., 1907-10-05
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