Photograph, Underwood & Underwood, N. Y.
Lock Gate Operating Machinery
The great gear wheel, known as a “bull wheel,” is connected with one leaf of the gate on the right by means of a strut so that revolving the bull wheel by means of an electric motor through a train of gears results in opening or closing the gate.
Panama, Past and Present
Scene showing the repaving of one of Panama’s old muddy streets with vitrified brick. Sewers and water pipes were laid throughout the city, resulting in a great reduction of disease.