One of the Hours
(Sketch for Apollo in his Chariot with the Hours )
1921–1925?
John Singer Sargent -- American painter 
Museum of Fine Arts, Boston
Graphite pencil on paper
Sheet: 43.5 x 27.2 cm (17 1/8 x 10 11/16 in.)
Gift of Miss Emily Sargent and Mrs. Violet Ormond in memory of their brother John Singer Sargent 28.800
Jpg: MFA

(See interactive zoom at the MFA) 

Studies for  Apollo in His Chariot