Scientific American Volume 88 Number 25 (June 1903) . By GEORGE 1*1. HOPKINS Revised and Greatly Enlarged. 2 Octavo Volumes. 1,100 Pages. 900 Illustrations. Cloth Bound, Postpaid, * Half Morocco, Postpaid, $ Or Volumes Sold Separately: cloth. per Volume; Half Morocco^ $ per Volume. EXPERIMENTAL SCIENCE is so well known tomany of our readers that it is hardly necessary now togive a description ofthis work. Mr. Hopkinsdecided some monthsago that It would benecessary to prepare anew edition of this workin order that i he manywonderful discoveriesof modern times mightbe fully d


Scientific American Volume 88 Number 25 (June 1903) . By GEORGE 1*1. HOPKINS Revised and Greatly Enlarged. 2 Octavo Volumes. 1,100 Pages. 900 Illustrations. Cloth Bound, Postpaid, * Half Morocco, Postpaid, $ Or Volumes Sold Separately: cloth. per Volume; Half Morocco^ $ per Volume. EXPERIMENTAL SCIENCE is so well known tomany of our readers that it is hardly necessary now togive a description ofthis work. Mr. Hopkinsdecided some monthsago that It would benecessary to prepare anew edition of this workin order that i he manywonderful discoveriesof modern times mightbe fully described in itspages. Since the lastedition was published,wonderful develop-ments in wireless teie-Kraihy, for example,have been made. It-was necessary there-fore, that a Rood deal ofnew matter should beadded to the work inorder to make it thor-oughly up-to-date, andwith this object in viewwine 200 pages haveBeen added. On ac-count of the increasedsize of the work, it hasbeen necessary to divideIt into two volumes,handsomely bound PROPOSALS. CEALED PROPOSALS WILL BE RECEIVED AT ° the office of the Light-House Engineer, Tompkins-ville, X. Y., until one oclock P. M., Wednesday. June24th, 1903, and then opened, for furnishing and deliver-ing miscellaneous articles require! for the use of theLiRht-House Establishment during the fiscal year toend June 30, 1904, in accordance with specifications,copies of which, with blank proposals and other infor-mation, maybe bad upon application to MAJOR WILLIAM T. RUSSELL U. S. A., Engineer Third Light-House District. MUNN Publishers, 36 «Sl CO., Broadway, New York. Notice to Contractors. Sealed Proposals marked Bid for Wheel Pit andTwo Tail Race Branch Tunnels will be received bythe undersigned until noon, July 14,1903, for the con-struction of a Wheel Pit and Two Tail Race BranchTunnels for the Electrical Development Company, ofOntario, Limited, Toronto, Ontario. Plans and specifi-cations for this work are on file and may be seen


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