The influence of footwear tread design on available friction and slip risk 

Tires in studio showing tread & white side, Southern California, 1932 [image] 

New tread on federal tires publicity shots, Bershon, Southern California, 1930 [image 1] 

New tread on federal tires publicity shots, Bershon, Southern California, 1930 [image 3] 

New tread on federal tires publicity shots, Bershon, Southern California, 1930 [image 2] 

Treading out rice, Bohol, Philippines, 1930 

Tire and close-up of tread, Western Auto Supply, Southern California, 1931 [image 3] 

Tire and close-up of tread, Western Auto Supply, Southern California, 1931 [image 1] 

Tire and close-up of tread, Western Auto Supply, Southern California, 1931 [image 2] 

fal-lanternslides-14~02 

fal-lanternslides-14~01 

Operations in re-tread depts., Los Angeles, Calif., 1939 [image 4] 

Operations in re-tread depts., Los Angeles, Calif., 1939 [image 2] 

Operations in re-tread depts., Los Angeles, Calif., 1939 [image 3] 

Operations in re-tread depts., Los Angeles, Calif., 1939 [image 1] 

Treading out the corn, Punjab, ca.1888-1920 

African woman treading sorghum, Nyasa, Tanzania, 1929 

Tread-mill water pump. 

Oxen treading wheat, , Punjab, Pakistan, ca.1890 

Tires in studio showing tread & white side, Southern California, 1932 

New tread on federal tires publicity shots, Bershon, Southern California, 1930 

Factory worker adding a spool of tread to tires, ca.1930 

Tire and close-up of tread, Western Auto Supply, Southern California, 1931 

Tread-mill water pump. 

A tank without its tread