TO CORRESPONDENTS. jig ill :JP Back Volumes Scientific American. Important Notice to us: Whenever any of our friends order numbers they have missed—we shall always send them if we have them on hand. We make this statement to save much time and trouble to which we are subjec be supplied. AD Terms of Advertising. One square of 8 lines 50 cents for each insertion. 12 lines 75 cts. 16 lines $100 ' ' Advertisements should not exceed 16 lines and cuts cannot be inserted in connection with them for any price. Patent Office. 128 FULTON ST. Letters Patent are informed that all business rela ting to the procuration of letters patent or filing ca veats is transacted at the Scientific American Office with the utmost economy and despatch. Drawings of all kinds executed on the most reasonable terms. Messrs. Munn & Co. can be consulted at all times in regard to Patent business at their office and such ad vice rendered as will enable inventors to adopt the safest means tor securing their rights. Arrangements have been made with Messrs. Bar low and Payne Patent Attornies in London for pro curing Letters Patent in Great Britain and France with great facility and dispatch. NITINN & CO. 128 Fultonstreet;New York. Arf LOCKS FOR CHURCHES PUBLIC V Buildings Railroad Stations &cThe subscri ber having made important improvements in the con struction of Clocks especially in the apparatus for counteracting the influence of the changes of tempe rature upon the pendulum and in the retaining pow er .(which keeps the clock going while being wound up) together with a most precise method of adjusting the pendulum to correct time are prepared to furnish time-keepers of a very. superior quality both for ac curacy of time-keeping and durability. They speak with confidence from having tested their perform ance for several years. The terms of payment will be so arranged as to afford purchasers ample oppor tunity to test their qualities. Address SHERRY & BYRAM Oakland Works Sag Harbor Long Island. 40
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