. Scientific American Volume 77 Number 02 (July 1897) . on officeas early as Thursday morning to appear in the follow-ing week^s issue. Marine Iron Works. Chicago. CatalORue free. U. S. Metal Polish. IndlanapollB. Samples free. Yankee Notions. Waterbury Button Co., Waterby, Ct. Improved Bicycle Machinery of every Garvin Machine Co., Spring and Varlck Sta., N. Y. Concrete Houses — cheaper than brick, superior toBtone. Ransome, 757 Monadnock Block, ChlcaKO. For static machines for all purposes, and X ray appa-ratus, write Beedsburg Electric Mfg. Co., Reedsburg,Wis., U. S. A. The
. Scientific American Volume 77 Number 02 (July 1897) . on officeas early as Thursday morning to appear in the follow-ing week^s issue. Marine Iron Works. Chicago. CatalORue free. U. S. Metal Polish. IndlanapollB. Samples free. Yankee Notions. Waterbury Button Co., Waterby, Ct. Improved Bicycle Machinery of every Garvin Machine Co., Spring and Varlck Sta., N. Y. Concrete Houses — cheaper than brick, superior toBtone. Ransome, 757 Monadnock Block, ChlcaKO. For static machines for all purposes, and X ray appa-ratus, write Beedsburg Electric Mfg. Co., Reedsburg,Wis., U. S. A. The celebrated HoraBby-Akroyd Patent Safety OilEngine is built by tbe De La Vergne Refrigerating Ma-chine Company. Foot of East 138th Street, New York. Tbe best book for electricians and beginners in elec-tricity is Experimental Science, by Geo. M. mail, $4. Munn & Co., publishers, 361 Broadway, N. Y. ^~ Send for new and complete catalogue of Scientificand other Books for sale by Munn & Co., 361 Broadway,New York. Free on nnm HINTS TO CORRESPONDENTS. Names and Address must accompany all lettersor no attention will be paid thereto. Tlus is for ouiinformation and not for publication. References to former articles or answers shouldgive date of paper and p^;e 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 letteior in this department, each must take his turn. Buyers wisbing to purctiase any article not advertisedm our columns will be furnished with addresses ofhouses manufacturing or carrying the same. Special Written Information on matters ofpersonal rather than general interest cannot beexpected without remuneration. Sclentlflc American Supplements referredto may be had at the office. Pnce 10 cents each. Books referred to prompUy supplied on receipt ofprice. ininerals sent (or examination shou
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