Pedzisa mutsara unotevera: Hammer akaunganidza girobhu raibvira rinobva kumativi ose enyika rainzi "The History of an Art" uye akariratidzira panguva dzakasiyana-siyana mumasangano emagetsi nemitambo. Akatanga kuiratidzira muna 1882 paInternational Electrical Exposition paCrystal Palace muLondon uye akapiwa menduru yesirivha nokuda kwokuratidzira kwacho. Apo iye akapa muunganidzwa wake pa
St. Louis World's Fair ya 1904 akapiwa Mubayiro Mukuru.