246 /. Locke on the Electro-Chronograph. 



6. By being connected with the ordinary telegraphic circuit it 

 will cause a time scale to be issued at any telegraphic distance, 

 said scale being marked by lines or dots* representing seconds or 

 other primary divisions of time. 



7. It will mark on the time scale the beginning of every minute. 



8. It will mark the beginning of every 5, 10. 20, &c, minutes. 



9. It will mark on the time scale the beginning of every hour. 

 10. It enables the operator at any part of the telegraphic wires 



to print down either there or at any other place in the circuit, the 

 occurrence of any event to the hundredth, or, if need be, to the 

 thousandth of a second, a property which the magnetic clocks 

 would not possess even if they were connected with the register- 

 ing machines. See Art. 4 and 5. 



11. By the 10th property, it enables the astronomer, from any 

 point of the circuit, by a touch of his finger, to print on the time 

 scale at any other points of the circuit, a legible and permanent 

 record of his observations, accurately as described in 10. 



12. It enables one clock to operate through any extent of com- 



• ^ • * * 1/1 m m • ♦ill 



plicated circuits, to generate time scales from all registers included 

 in them, and permits separate and independent observations to be 

 made and printed into each and every of these time scales, with- 

 out any interference with each other, and all this too, with but a 

 single circuit, and a single battery in that circuit. 



13. Thus, at two points selected for determination of difference 

 of longitude, one clock only is required, and the use of that clock 

 is better than two or more, because of the absolute unity or syn- 

 chronism which is thus attained. 



14. For an observatory with several instruments, or for any 

 number of observatories situated distantly from each other, but 

 one clock is needed, and for reasons named in 13, that one clock 

 is better than many. 



15. All this is done without changing the rate of going of the 

 clock, and all the above properties have been tested by actual trial. 



19. By far the most formal document which has appeared in 

 reference to the electro-chronograph, has been the report of Dr. 

 Bache to Congress, including the sub-report of Coast Survey As- 

 sistant, Sears C. Walker, which last has been published in your 

 Journal. 



20. My remarks upon that report will be confined chiefly to 

 such points as are known to have produced misapprehension. An 

 officer of government informed me, that as he understood the re- 

 port of Mr. Walker, the intention, of some parts of it at least, was 

 to attribute the invention of the chronograph not to myself, but 

 to another person. 



* One or the other by adjustment, 



■ 



