SOS .13 



sciErreE 



tEntered at the Posi-Offlce of New York, N.i., as Second-Clasa Matter.J 



Ninth Year. 

 Vol. XVIII. No. 439. 



NEW YORK, July S, 1891. 



New Method of Protecting Property 

 from Lightning. 



The Lightning Dispeller. 



The Patent Lightning Dispeller is a conduc- 

 tor specially designed to dissipate the energy 

 of a liglitniug discharge, — to prevent its 

 doing harm, — placing something in its path 

 upon which its capacity for causing damage 

 may be expended. 



No recorded case of lightning stroke has 

 yet been cited against the principle of the 

 Dispeller. So far as known, the dissipation 

 of a conductor has invariably protected under 

 the conditions employed. 



The Dispeller will be sent prepaid, with 

 full directions for its application, to any 

 part of the United States on receipt of S5.00. 



Correspondence solicited. 



AGENTS ■WANTED. 



N. D. C. HODGES, 



47 Lafayette Place, - - New York. 



MIMEDAI C Cabinet Specimens. Collections. 

 Ill I II L n A LO • Foe Blowpipe Analysis. 



Largest and floest stock in U. S. 100pp. Illustrated 

 Catalogue, paper bound, 15c ; cloth bound, 2oc. 



GEO. L. ENGLISH & CO, Jlineraloglsts, 

 Removed to 73-3 & 735 Broadway, New York. 



Conrse of Mineralogy for Yonng People. 



Third Grade ready, containing directions how to 

 study minerals by means of blowpipe analysis. 



Book, Collection, Correspondence one dollar 

 pdstage, 25 cents. Address 



GUSTAVE GUTTENBERG, 

 Central High School, Pittsburgh, Pa 



ROSE POLYTECHNIC INSTITUTE. 



TERRE UAITE, 1M)IA>A.— A SCHOOL OF EXGIAFDKLX;. 



Well endowed, well equipped departments of Civil, 

 Mechanical and Electrical Engineering, Chemistry, 

 Drawing. Extensive Shops and Laboratories. Ex- 

 penses low. For catalogue address H. T. Eddy, Pros. 



Th( 



Remington 



has set the copy for writing 

 machines for 15 years. 

 It is to-day the 



Standard 



and expects in the future, 

 as it has in the past, 

 to lead all others 

 in adding improvements 

 to what will always be 

 the true model of a 



Typewriter. 



Wyckqff, Seamans <S-» Benedict, 

 327 Broadway, New York. 



On Jan. 1st, and at intervals of two months 

 since, has been published the New Zealand 

 Journal of Science, dealing with all branches 

 of natural science, especially in relation to 

 the colony. Subscription (including postage 

 to America). 12s. Gd. per annum, payable to 

 the Editor, care Matthews, Baxter & Co., 

 Bowling St., Dunedin, N. Z. 



PROTECTION FROM LIGHTNING. 



All the capital desired for the parent com- 

 pany to handle my patents on a new method 

 of protecting buildings from lightning has been 

 subscribed. Sub-companies and agencies to 

 introduce the invention are forming, and any 

 desirous of taking State-rights may address me, 

 for the present, as below. 



The English patent is for sale. 



N. D. C. HODGES, 47 Lafayette Place, New York. 



%»„ "'GLE Copies, Ten Cents. 

 ,, $3:5. ", Year, in Advance. 



HEt» 



Can any re^. of Science cite 

 a case of lightning stroke in 

 which the dissipation of a small 

 conductor (one-sixteenth of an 

 inch in diameter, say,) has failed 

 to protect between two horizon- 

 tal planes passing through its 

 upper and lower ends respective- 

 ly? Plenty of cases have been 

 found which show that when the 

 conductor is dissipated the build- 

 ing is not injured to the extent 

 explained (for many of these see 

 volumes of Philosophical Trans- 

 actions at the time when light- 

 ning was attracting the attention 

 of the Royal Society), but not 

 an exception is yet known, al- 

 though this query has been pub- 

 lished far and wide among elec- 

 tricians. 



First inserted June 19. No response 

 to date. 



N. D. C. HODGES, 47 Lafayette Place, N. Y. 

 WALKER PRIZES IN NATURAL HISTORY. 



The Boston Society of Natural History 



offers a first prize of from $150 to glOO, and a second 

 prize of a sum not exceeding 350, for the best me- 

 moirs, in English, on one of the following subjects: 



1. An original investigation into any of the prob- 

 lems connected with the geology of the last ice epoch 

 in New England; any of the glacial features, as, for 

 instance, the distribution and history of moratnal 

 deposits and eskers, or of sand plains may be se- 

 lected. 



2. An original investigation into the recent changes 

 of level of the whole or of a part; of the shore line of 

 the eastern United States. This inquiry must in- 

 clude observations on and discussions of the phe- 

 nomena eshibited by elevated sea margins and sub- 

 merged forests. 



3. A study of any river valley in New England 

 containing an area of not less than one hundred 

 square miles; the inquiry to include the preglacial 

 history of the stream, the changes effected In the 

 basin by the last ice epoch, the relation of the valley 

 to the neighboring basins, and to changes of level of 

 the sea. 



Each memoir must be accompanied by a sealed 

 envelope, enclosing the author's name and super- 

 scribed by a motto corresponding to one borne by 

 the manuscript, and must be handed to the Secre- 

 tary on or before April 1st. Yn^^'i. 



Prizes will not be awarded unless the memoirs are 

 deemed of adequate merit. 



For further particulars applv to 



riAMUEL DEXTER, Secretary. 



Boston. July I. 1S91, 



JOHNS HOPKINS UNIVERSITY, 



BALTIMORE. 



Announcements for the next academic 

 year are now ready and will be sent on ap- 

 plication. 





5 /V/^rmNM ^'^ " 





