Western Front
Second Lieutenant Albert Ball in Nieuport 17 attacks 5 Rolands, forcing 2 down, destroys 2 more on August 22 in 11 Squadron action with about 15 German aircraft (4 lost); makes another kill (with 60 Squadron on August 28) from 4 aircraft attacked; 2 more kills (on August 31).
Battle of the Somme: Foch visits Haig, latter then replies to Joffre‘s letter of August 11; certain local operations are inevitable, Haig has arranged with Foch a combined attack for August 18; another to follow August 22. But Haig can make no promises of subsequent operations dates, insufficient forces for early large-scale attack on Thiepval front.
British advance west and southwest of Guillemont. French capture trenches along 12-mile sector astride river with 1,300 PoWs, repel German attacks north of Maurepas on August 18.

Eastern Front
Brusilov Offensive, Galicia: Heavy Russian attacks west of Sereth.
Total of Russian captures published. (It is unclear if this means Austro-Hungarian & German prisoners captured by the Russians, or the total number of Russians captured by the Central Powers).

Southern Front
Isonzo: Artillery active.
Salonika: French 17th Colonial Division captures La Tortue at second attempt but twice forced out Doljeli (second on August 17); 1,100 casualties since August 9. British battallion captures Horseshoe Hill in support to west on August 17.

Political, etc.
Germany: German authorities arrest 106 people for smuggling in food to Berlin and selling them at 300% profit.
United Kingdom: Terms of new British War Loan to be raised in U.S.A. announced.
Special Register Bill postponed.
France: Report shows that France is spending $397.4 million (about $8.8 billion today) a month for the war effort.
United States: U.S. House of Representatives approves Senate plan to build 157 warships in three years.

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On the kinkometer, my kink measures as a sine wave.