. Scientific American Volume 84 Number 05 (February 1901) . tt & Co., Mt. Holly, N. J. Yankee Notions. Waterbury Button Co., Waterby, Ct. Hook and Eye Patent for Sale. F. J. Rappold, Erie, Pa. Handle & Spoke Mchy. Ober Mfg. Co., 10 Bell St.,Chagrin falls, O. Rigs that Run. Hydrocarbon system. Write St,Louis Motor Carriage Co., St. Louis, Mo. Machine Work of every description. Jobbing and re-pairing. The Garvin Machine Co., 141 Varick St., N. Y. Oil Engines, the Design and Construction of. ByGoldingham. Just out. By mail, $2. Spon and Cham-berlain, 12 Cortlandt Street, New York, u. S. A. The ce
. Scientific American Volume 84 Number 05 (February 1901) . tt & Co., Mt. Holly, N. J. Yankee Notions. Waterbury Button Co., Waterby, Ct. Hook and Eye Patent for Sale. F. J. Rappold, Erie, Pa. Handle & Spoke Mchy. Ober Mfg. Co., 10 Bell St.,Chagrin falls, O. Rigs that Run. Hydrocarbon system. Write St,Louis Motor Carriage Co., St. Louis, Mo. Machine Work of every description. Jobbing and re-pairing. The Garvin Machine Co., 141 Varick St., N. Y. Oil Engines, the Design and Construction of. ByGoldingham. Just out. By mail, $2. Spon and Cham-berlain, 12 Cortlandt Street, New York, u. S. A. The celebrated Hornsby-Akroyd Patent Safety OilEngine is built by the De La Vergne Refrigerating Ma-chine Company. Foot of East 138th Street, New York. The best book for electricians and beginners in elec-tricity is Experimental Science, by Geo. M. mail, $4. Munn & Co., publishers. 361 Broadway, N. Y. fW Send for new and complete catalogue of Scientificand other Books for sale by Munn & Co., 361 Broadway,New York. Free on nones HINTS TO CORRESPONDENTS. Names and Address must accompany all lettersor no attention will be paid thereto. This ie for ourinformation and not for publication. References to former articles or answers shouldgive date of paper and pane or number of question. Inquiries not answered in reasonable time shouldbe repeated; correspondents will bear in mind thatsome answers require not a little research, and,though we endeavor to reply to all either by letteror in this department, each must take his turn. Buyers wishing to purchase any article not advertisedin our columns will be furnished with addresses ofhouses manufacturing or carrying the same. Special Written Information on matters ofpersonal rather than general interest caDnot beexpected without remuneration. Scientific American Supplements referredto may be had at the office. Price 10 cents each. Books referred to promptly supplied on receipt ofprice. minerals sent for examination should
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