Numerous photographs related to Edison, and to Hammer's career

Photograph of the first flashing column of light, recto

Photograph of the first flashing column of light, verso

Six photographs of metal surfaces, recto

Six photographs of metal surfaces, verso

Edison pioneers, front cover, recto

Edison pioneers, front cover, verso

Two photographs of Thomas A. Edison, recto

Two photographs of Thomas A. Edison, verso

Electrical review, editorial, p. 387

Electrical review, editorial, p. 388

Electrical review, editorial, p. 389

Electrical review, editorial, p. 390

Electrical review, editorial, p. 391

Electrical review, editorial, p. 392

Illustration of Thomas A. Edison in his laboratory, recto

Illustration of Thomas A. Edison in his laboratory, verso

Photographer of children, front cover, recto

Photographer of children, front cover, verso

Portrait of Thomas A. Edison, recto

Portrait of Thomas A. Edison, verso

Lithograph of Thomas A. Edison's magneto telephone, recto

Lithograph of Thomas A. Edison's magneto telephone, verso

Photograph of banquet held in celebration of Thomas A. Edison, recto

Photograph of banquet held in celebration of Thomas A. Edison, verso

Photograph of the first flashing electric sign in the world, recto

Photograph of the first flashing electric sign in the world, verso

Photograph of Thomas A. Edison's 1st electric railroad at Menlo Park, recto

Photograph of Thomas A. Edison's 1st electric railroad at Menlo Park, verso

Photograph of the American electrical specialties section at the Crystal Palace, recto

Photograph of the American electrical specialties section at the Crystal Palace, verso

Photograph of the first flashing column of light, recto

Photograph of the first flashing column of light, verso

Drawing of Reis' needle receiver 1860, No. 1, recto

Drawing of Reis' needle receiver 1860, No. 1, verso

Drawing of Rei's electro magnetic receiver 1862, No. 2, recto

Drawing of Rei's electro magnetic receiver 1862, No. 2, verso

Drawing of Reis' transmitter 1862, No. 2a, recto

Drawing of Reis' transmitter 1862, No. 2a, verso

Drawing of Clerac's tube, a tension regulator 1865, No. 2b, recto

Drawing of Clerac's tube, a tension regulator 1865, No. 2b, verso

Drawing of Gray's blacking-box receiver 1875, No. 3, recto

Drawing of Gray's blacking-box receiver 1875, No. 3, verso

Drawing of Grays transmitter, No. 3, recto

Drawing of Grays transmitter, No. 3, verso

Drawing of Edison's transmitter, No. 4, recto

Drawing of Edison's transmitter, No. 4, verso

Drawing of Bell's iron box receiver 1876, No. 4, recto

Drawing of Bell's iron box receiver 1876, No. 4, verso

Drawing of Bell's box telephone receiver, No. 5, recto

Drawing of Bell's box telephone receiver, No. 5, verso

Drawing of Bell's telephone, No. 6, recto

Drawing of Bell's telephone, No. 6, verso

Drawing of Hughes' microphone, No. 7, recto

Drawing of Hughes' microphone, No. 7, verso

Drawing of Hunnings' transmitter, No. 8, recto

Drawing of Hunnings' transmitter, No. 8, verso

Drawing of Edison's lamp black telephone, No. 9, recto

Drawing of Edison's lamp black telephone, No. 9, verso

Photographs of sculptural art work by Mr. Julio Kilenyi, recto

Photographs of sculptural art work by Mr. Julio Kilenyi, verso

Photograph of the Jumbo dynamo, recto

Photograph of the Jumbo dynamo, verso

Photograph of William J. Hammer's scientific and experimental apparatuses, recto

Photograph of William J. Hammer's scientific and experimental apparatuses, verso

Photograph of Thomas A. Edison receiving his first phonogram, recto

Photograph of Thomas A. Edison receiving his first phonogram, verso

Photograph of Thomas A. Edison receiving his first phonogram, recto

Photograph of Thomas A. Edison receiving his first phonogram, verso

Photograph of banquet tendered to Thomas A. Edison, recto

Photograph of banquet tendered to Thomas A. Edison, verso

The spirit of invention marches on in Thomas A. Edison's laboratories, newspaper clipping, recto

The spirit of invention marches on in Thomas A. Edison's laboratories, newspaper clipping, verso