438 



The National Physical Laboratory. 



Table III. — Hourly Means of the Horizontal Force in C.Gr.S. units (corrected 



(The Mean for the 



H 



urs 



Preceding 



Mid 



1 



2. 



3. 



4. 



5. 1 6. 



1 



7 



Q 

 o. 



Q 

 £7. 



10 



11. 





noon. 



















! — 



•18000 + 









"Winter. 

















1900. 





























Months. 





























Jan. ... 



*±\J i 





413 



ATA 



414 



416 



417 



418 



Al Q 



no 



Q±a 



QUO 



QUO 



Feb. ... 



404 



414 



415 



415 



416 



416 



417 



419 



417 



415 



412 



408 



407 



March . . 



408 



421 



421 



421 



421 



420 



421 



419 



419 



415 



408 



401 



399 



Oct. ... 



422 



443 



443 



442 



443 



444 



446 



446 



444 



439 



427 



421 



420 



Nov. .. . 



438 



441 



442 



441 



442 



443 



443 



443 



441 



437 



432 



430 



431 



Dec. . . . 



441 



443 



443 



443 



443 



443 



443 



443 



444 



444 



444 



443 



441 



Means. . 



420 



429 



429 



429 



430 



430 



431 



431 



431 



428 



422 



418 



417 













Summer. 

















i 



April . . . 



405 



425 



425 



425 



425 



425 



424 



424 



424 



420 



412 



404 



402 



May . . . 



400 



422 



422 



419 



420 



418 



416 



412 



408 



404 



401 



404 



405 



J une . . . 



421 



436 



435 



433 



434 



435 



435 



430 



427 



423 



415 



409 



409 



July . . . 



425 



446 



442 



441 



440 



440 



439 



436 



433 



427 



419 



415 



417 



Aug. . . . 



421 



437 



436 



435 



435 



433 



432 



429 



422 



414 



409 



411 



416 



Sept 



428 



439 



438 



436 



436 



436 



434 



432 



427 



421 



416 



413 



416 



Means. . 



417 



434 



433 



432 



432 



431 



430 



427 



423 



418 



412 



409 



411 



Table IV. — Diurnal Inequality of the 



Hours 



Mid. 





2. 



3. 



4. 



5. 



6. 



7. 



8. 9. 



10. 11. 



Summer Means. 





+ -00006 



+ '00004 + -00003 



+ -00003;+ '00003 + -00002 



- -ooooi 



- -00005 



- -oooio 



- -00017 



- -00019 



- -00018 



Winter Means. 



+ -ooooi 



+ -ooooi 



+ -00001 + '00002 



1 



+ -00002 



+ -00003 



+ -00003; + -00003 



•ooooo 



1 



- -00006 - -00010 



1 



- -00011 



Annual Means. 





+ -00003 



+ -00003 



+ '00002 



+ -00002 



+ -00002 



+ -00002 



+ -ooooi 



- -00001 - -00005 



- -00011 



1 



- -00015 !- -00014 



Note. — When the sign is + the 



