1942 Print Aeroembolism Dmitri Kessel Oxygen Mask Aviation Pilot Wartime FZ7 SPANISH4 which could be adjusted by

which could be adjusted by foot

This is an original 1937 color print map titled

He ran for the presidency in 1928

" This is an original 1872 halftone print of the Playground in Central Park in New York City

This is an original 1908 black and white print ad promoting the Grape-Nuts from Postum Cereal Company located in Battle Creek

1942 Print Aeroembolism Dmitri Kessel Oxygen Mask Aviation Pilot Wartime FZ7 SPANISH4 which could be adjusted byThis is an original 1942 halftone print of a pilot exercising on a bicycle with an oxygen mask on. The caption writes, "This prevents aeroembolism, an ailment analgous to the bends of deep sea divers, caused by the occurrence of nitrogen bubbles in the body at low atmospheric pressures above 30,000 feet. Breathing oxygen and exercising thirty minutes eliminates nitrogen, but combat pilots would rarely have time for such a ritual." Photography by