2 
the sands pointing to the direction in which the sun was 
when he planted it for the “benefit of his unseen follower, 
down through the clepsydra, to the mediaeval watches and 
clocks, to the invention of the pendulum and the “balance 
spring] through later ones, to the most recent refinements 
of the Schultz chrono scope, which gives the millionth part 
of one second. 
I hope you can arrange that Mr, Maynard may he 
encouraged to write about these. 
I speak of the above matters with special reference 
to the letter on the subject, which comes before me, ad- 
dressed to Captain Davis. This is not quite apt to the 
case ; .for instance, in speaking of an early chronometer of 
American manufacture, because there were no really early chroucmeter. 
American manufacture; though it would be very well to have a 
recent one as an example of the best modern development. 
I should like to have Mr. Maynard, with your per- 
mission, consider where these things could most likely be 
found, and prepare a letter or letters from me addressed to 
various departments of the Government service, where any 
such archaic instruments would be likely to be procurable, 
and to the War Department, asking information and help. 
