Photograph of 2 men working in a repair shop. The shop likely services buses operated by the Spokane, Portland & Seattle Railway. Handwritten note on the back of the print reads, "Stage repair." Stamp on the back for Arthur M. Prentiss, Commercial Photographer.

Photograph of the back head of the boiler in a steam locomotive cab. Hoses and gauges are attached to the side of a machine. Handwritten label at the bottom of the print reads, "S-1924 #10, S.P.&S."

Interior view of Hosmer Cultivator Factory in Silverton, Oregon. Two men stand in the room, one behind a workbench and the other holding a piece of a cultivator. A large machine is visible to the left of the image with the words "J.E. Hosmer Silverton, Ore." written on it. A pile of wood pieces can be seen on the floor.

View of a burned forest that had previously been logged in the Silverton, Oregon area. Charred tree trunks and stumps can be seen throughout the landscape. The ground is littered with logging machinery and debris from the Silver Falls Timber Company.

Photograph showing the interior of Station G at the Cazadero Dam showing the generator units and building structure. Several large windows an be seen on the left side of the frame, and a man can be seen in the background near the top.

Photograph showing the interior of the Cazadero power station at Station G, with the first three generating units. Large rounded windows can be seen on the right side of the high peaked room, and on the side of the generators is written “Allis Chalmers Company.”

Photograph of generator unit #3 at Cazadero Dam/Station G, taken two months after the 1908 accident due to equipment malfunction. On the front of the unit “General Electric Company” is written. A man stands on the left side of the frame with one hand on a wheel.

Photograph showing the head gate controllers at the Cazadero power station (Station G). Each controller is painted with a number.

Photograph showing the main turbine unit at Cazadero Dam/Station G. On a small sign at the front of the unit is written “847.” (image note: glass plate is broken on two edges).

Photograph showing a caterpillar machine at the top of a canyon, with a man driving in an open cockpit. Next to the machine is a man standing to the side of the dirt track, and a car with an open door can be seen in the background.

Photograph showing a man driving a open cockpit caterpillar machine at the top of a canyon at Cove Palisades State Park. At the base of the canyon is a river (the Deschutes River or Crooked River). On the machine is written "Caterpillar."

Photograph showing a man (Alex Komolofske) wearing a dirtied work jumper standing next to a wheeled generator vehicle. A "PGE" logo is attached to the generator, with "Onan Electric Plant" painted on the side.

Photograph taken from a high angle, looking downward at a kneeling man working on a large electrical generator at an unidentified location. Another unit can be seen in the background. Written on the negative is "51-880."

Photograph showing a man wearing a long jacket standing on a raised cement platform. He is looking towards three large electrical units with belts, and water can be seen under the platform. In the background is a wooded hillside. Written on the negative is "51-868."

Photograph showing five women sitting at individual card punch accounting machines. Each person has a pad holder to her left, and a visible punch card in the machine. Hanging coats can be seen in the background, as well as two large windows.

Photograph showing a man looking at an accounting machine, with the mechanism covers removed. Multiple conduits and a fan can be seen. A bar runs across the bottom of the frame, blocking some of the image.

Photographs showing two men in suits standing to either side of a large radio transmitter unit. They are both looking at the unit, and the man on the right is smiling. A sign on the unit reads "Wired Radio Transmitter, Line Material Co." Written on the negative is "50-658."

Photograph showing a man using a industrial monkey while trimming a tree away from electrical lines. He is holding the handle of a wired tool while looking downward at the tree. Written on the negative is "50-480."

Photograph showing two men feeding branches into a wood chipper. Wood chips can be seen coming out from the side of the unit. Written on the negative is "50-439."

Photograph showing workers in an open area using a truck mounted "Williams Hole Digger." The man on the right is facing towards the machine and is leaning towards the hole, while the other man stands to the left also looking towards the hole. Written on the negative is "50-411."

Photograph of a man sitting in front of a switchboard unit. Two meters on the unit are visible, with "watts" and "volts." The is turning a numbered dial with his right arm while facing away from the camera. Written on the negative is "50-376."

Photograph showing the interior of the A large 7500 KW turbine generator is in the middle of the frame, and arched windows can be seen in the background.

Photograph showing the interior of the Station E in northwest Portland, near the intersection of NW 21st Avenue and NW Sherlock Avenue. Several large machines are visible throughout the room, and a small desk can be seen at the center of the frame. One wall includes large arched windows.

Photograph showing an engine exciter at Station E (northwest Portland, near the intersection of NW 21st Avenue and NW Sherlock Avenue). Two men in overalls stand to the left of the machine, looking at the camera. The man on the right is holding a small mechanical wheel.

Photograph showing the interior of Station E (northwest Portland, near the intersection of NW 21st Avenue and NW Sherlock Avenue), taken from a high angle. Several large pieces of machinery can be seen throughout the run, as well as electric lights.

Photograph showing interior construction at Station E (northwest Portland, near the intersection of NW 21st Avenue and NW Sherlock Avenue). Two large pieces of round machinery can be seen in the background, with woods crates in the front.

Photograph showing turbine construction at Station E (northwest Portland, near the intersection of NW 21st Avenue and NW Sherlock Avenue). Several large machines can be seen in the room, with a hole visible in the brick wall behind.

Photograph showing interior construction at Station E (northwest Portland, near the intersection of NW 21st Avenue and NW Sherlock Avenue). Several men look at the camera on the left and right sides of the frame. In the center, a piece of machinery is hand painted with “Portland General Electric, Portland, Or.” Another man stands on top of the unit.