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A carpenter at the TVA's new Douglas dam on the French Broad River, Tenn., 1942. Creator: Alfred T Palmer.

HRM22A79_091

A carpenter at the TVA's new Douglas dam on the Fr...

Generator works at the winding of a generator stator...Wilson Dam, Sheffield vicinity, Ala., 1942. Creator: Alfred T Palmer.

HRM22A79_104

Generator works at the winding of a generator stat...

Eight generator units in the generator room of a new...Wilson Dam, Sheffield vicinity, Ala., 1942. Creator: Alfred T Palmer.

HRM22A79_115

Eight generator units in the generator room of a n...

Insulators and transmission wires in the switchyard of the TVA's Chickamauga Dam..., Tennessee, 1942 Creator: Alfred T Palmer.

HRM22A79_122

Insulators and transmission wires in the switchyar...

Tightening a nut on a guide vane operating seromotor in TVA's..., Watts Bar Dam, Tennessee, 1942. Creator: Alfred T Palmer.

HRM22A79_112

Tightening a nut on a guide vane operating seromot...

Section of one of the switchyards from which high....Wilson Dam..., Sheffield vicinity, Ala., 1942. Creator: Alfred T Palmer.

HRM22A79_102

Section of one of the switchyards from which high....

Generator hall of the powerhouse, Chickamauga Dam, Tenn. , 1942. Creator: Alfred T Palmer.

HRM22A79_113

Generator hall of the powerhouse, Chickamauga Dam,...

Gas welding a joint in a line...at the TVA's new Douglas Dam on the French Broad River, Tenn., 1942. Creator: Alfred T Palmer.

HRM22A79_093

Gas welding a joint in a line...at the TVA's new D...

Checking the alignment of a turbine shaft at the top of the guide..., Watts Bar Dam, Tenn., 1942. Creator: Alfred T Palmer.

HRM22A79_111

Checking the alignment of a turbine shaft at the t...

Packard 2A-1500, Inverted V-12 Engine, Circa 1925. Creator: Packard Motor Car Company.

HRM21A87_493

Packard 2A-1500, Inverted V-12 Engine, Circa 1925....

Jacobs (Pratt & Whitney Wasp Jr.) R-985-AN5, Radial 9 Engine, ca. 1940. Creator: Jacobs Aircraft Engine Company.

HRM21A88_054

Jacobs (Pratt & Whitney Wasp Jr.) R-985-AN5, Radia...

Allison V-1710-7 (V-1710-C4), V-12 Engine, 1936. Creator: General Motors.

HRM21A88_055

Allison V-1710-7 (V-1710-C4), V-12 Engine, 1936. C...

Stringfellow Steam Engine, 1868. Creator: John Stringfellow.

HRM21A87_471

Stringfellow Steam Engine, 1868. Creator: John Str...

Duesenberg H Direct, V-16 Engine, 1918. Creator: Duesenberg Motors Corporation.

HRM21A88_052

Duesenberg H Direct, V-16 Engine, 1918. Creator: D...

Curtiss CD-12 Prototype (Serial Number 1) V-12 Engine, Circa1921. Creator: Curtiss Aeroplane and Motor Company.

HRM21A87_482

Curtiss CD-12 Prototype (Serial Number 1) V-12 Eng...

Continental Hyper I-1430-11, Inverted V-12 Engine, 1942. Creator: Continental Aviation and Engineering Corporation.

HRM21A88_053

Continental Hyper I-1430-11, Inverted V-12 Engine,...

Curtiss C-4 or D-4, In-line 4 Engine, ca. 1907. Creator: Curtiss Aeroplane and Motor Company.

HRM21A88_118

Curtiss C-4 or D-4, In-line 4 Engine, ca. 1907. Cr...

Curtiss OXX-6, V-8 Engine, ca. 1916. Creator: Curtiss Aeroplane and Motor Company.

HRM21A88_139

Curtiss OXX-6, V-8 Engine, ca. 1916. Creator: Curt...

Wright H-3 V-8 Engine, ca. 1922. Creator: Wright Aeronautical.

HRM21A88_128

Wright H-3 V-8 Engine, ca. 1922. Creator: Wright A...

Allison XV-1710-1, V-12 Engine, 1933. Creator: General Motors.

HRM21A88_056

Allison XV-1710-1, V-12 Engine, 1933. Creator: Gen...

Curtiss V-X, V-8 Engine, Circa 1915. Creator: Curtiss Aeroplane and Motor Company.

HRM21A88_015

Curtiss V-X, V-8 Engine, Circa 1915. Creator: Curt...

Curtiss R3C-2, 1925. Creator: Curtiss Aeroplane and Motor Company.

HRM21A87_484

Curtiss R3C-2, 1925. Creator: Curtiss Aeroplane an...

Maybach In-line 6 Engine, ca. 1916-1917. Creator: Maybach Motorenbau.

HRM21A87_496

Maybach In-line 6 Engine, ca. 1916-1917. Creator: ...

Curtiss V-4, V-12 Engine, Circa 1915. Creator: Curtiss Aeroplane and Motor Company.

HRM21A88_026

Curtiss V-4, V-12 Engine, Circa 1915. Creator: Cur...

Rolls-Royce Eagle VIII, V-12 Engine, Circa 1917-1922. Creator: Rolls-Royce.

HRM21A88_076

Rolls-Royce Eagle VIII, V-12 Engine, Circa 1917-19...

Curtiss Conqueror V-1570-53 (G1V-1570-F), V-12 Engine, ca. 1928. Creator: Curtiss Aeroplane and Motor Company.

HRM21A88_112

Curtiss Conqueror V-1570-53 (G1V-1570-F), V-12 Eng...

Hall-Scott A-7-A, In-line 4 Engine, Cutaway, ca. World War I. Creator: Hall-Scott.

HRM21A88_135

Hall-Scott A-7-A, In-line 4 Engine, Cutaway, ca. W...

Clerget 9 A Diesel, Radial 9 Engine, ca. 1928. Creator: Panhard-Levassor.

HRM21A88_147

Clerget 9 A Diesel, Radial 9 Engine, ca. 1928. Cre...

BMW Model IIIA In-line 6 Engine, 1918. Creator: BMW.

HRM21A88_138

BMW Model IIIA In-line 6 Engine, 1918. Creator: BM...

Packard B-12 (Model 905), V-12 Engine, Circa 1916. Creator: Packard Motor Car Company.

HRM21A88_115

Packard B-12 (Model 905), V-12 Engine, Circa 1916....

Hall-Scott A-7-A In-line 4 Engine, 1917. Creator: Hall-Scott.

HRM21A87_479

Hall-Scott A-7-A In-line 4 Engine, 1917. Creator: ...

Thomas-Morse Model 8, V-8 Engine, 1917. Creators: Curtiss Aeroplane and Motor Company, Thomas-Morse Aircraft.

HRM21A87_500

Thomas-Morse Model 8, V-8 Engine, 1917. Creators: ...

Boeing T50-BO-8A (502-10VC) Turboshaft Engine, ca. 1950s. Creator: Boeing Aircraft Co..

HRM21A88_156

Boeing T50-BO-8A (502-10VC) Turboshaft Engine, ca....

Rolls-Royce Merlin R.M. 14S.M. Mk 100 V-12 Engine, 1944. Creator: Rolls-Royce.

HRM21A88_092

Rolls-Royce Merlin R.M. 14S.M. Mk 100 V-12 Engine,...

Nakajima Mamoru 11, Radial 14 Engine, Circa World War II. Creator: Fuji Koku Keiki.

HRM21A88_142

Nakajima Mamoru 11, Radial 14 Engine, Circa World ...

Michigan Aero-Engine Corporation Rover L-267, In-line 4 Engine, ca. 1930. Creator: Michigan Aero-Engine Corporation.

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Michigan Aero-Engine Corporation Rover L-267, In-l...

Packard 1A-2775 X-24 Engine, Circa 1927. Creator: Packard Motor Car Company.

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Packard 1A-2775 X-24 Engine, Circa 1927. Creator: ...

Bugatti Type 43 Grand Sport of KW Bear, MAC Shelsley Walsh Hillclimb, Worcestershire, 1930s. Artist: Bill Brunell.

HRM19B62_065

Bugatti Type 43 Grand Sport of KW Bear, MAC Shelsl...

MG Magna of K Bear competing in the BOC Hill Climb, Chalfont St Peter, Buckinghamshire, 1932. Artist: Bill Brunell.

HRM19B62_462

MG Magna of K Bear competing in the BOC Hill Climb...