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25. The experiment of Prof. Mitchel mentioned, p. 4, furnish- 

 ed a dotted fillet, on which not only were no observations printed 

 but for reasons which I have previously shown, none could be 

 so printed, under the usual conditions of telegraphic distance, a 

 single circuit and a single battery. 



26. " On the 17th of November last, Dr. Locke's delicate astro- 

 nomical clock, of his own construction, was supplied with the 

 requisite apparatus made from his drawings by his son. At the 

 expense of the coast survey, I directed wires to be put up for the 

 purpose of- connecting his clock with the Cincinnati and Pitts- 

 burg line, about four hundred miles in length. The experiment 

 was eminently successful, and the registering of the seconds of 

 time on the running fillet of paper was continued for two hours 

 at all the offices along the line, much to the astonishment of the 

 operators. I send you a specimen of the graduated fillet of pa- 

 per. It consists, as you will notice, of an indented line of about 

 nine-tenths of an inch ia length, followed by a complementary 

 blank space of about one-tenth. The two make a second of 

 time, commencing with the beginning of the line." 



The above paragraph, p. 4, is a clear announcement of facts. 



Here Mr. Walker defines the term " Automatic clock Register," 

 but he does not say whether ''graduated fillet" means a fillet' 

 graduated both with time marks and observations, or merely the 

 former. He uses the term subsequently, however, including both, 

 and in that sense it is equivalent to my electro-chronograph or 

 the Printing Method of observation. Prof. Wheatstone's inter- 

 niptor could not furnish it. 



27. "In order to carry out fully your wishes and instructions, 

 it would be necessary that this automatic clock register should 

 distinguish the hours, minutes and seconds. Dr. Locke proposes 

 for this purpose to make the beginning of the ordinary minutes 

 omit one, of Jives of minutes two, of tens of minutes three, and of 

 on hour omit four consecutive blank spaces. Thus ordinary be- 

 ginnings of minutes have continuous lines of two seconds, fives 

 three, tens four , and hours jive." 



The above paragraph is somewhat ambiguous and conveys the 

 idea that the author's patron had anticipated the invention and 

 gave " instructions" that the "automatic clock register" should 

 " distinguish the hours, minutes, and seconds/' One would sup- 

 pose that this was one of the items in the "list of desiderata fur- 

 nished to me." 



I have given the only suggestions which were made to me, 

 and had I done no more than accomplish the objects there pro- 

 Posed, I should never have claimed to myself the performing 

 of any thing worth the effort of recovering. It is true that 

 Mr. Walker called my attention, at that time, to the subject; 

 and in aiding him to do what he suggested, I pursued the subject 



Second Series, VoL VIII, No. 28*— Sept, 1849. 32 



