Published articles, off prints, and circuit diagrams relating to telephony

Telephone competition, pamphlet, front cover, recto

Telephone competition, pamphlet, front cover, verso

Telephone competition, pamphlet, [p. 3]

Telephone competition, pamphlet, [p. 4]

Telephone competition, pamphlet, p. 5

Telephone competition, pamphlet, p. 6

Telephone competition, pamphlet, p. 7

Telephone competition, pamphlet, p. 8

Telephone competition, pamphlet, p. 9

Telephone competition, pamphlet, p. 10

Telephone competition, pamphlet, p. 11

Telephone competition, pamphlet, p. 12

Telephone competition, pamphlet, closed foldout, recto

Telephone competition, pamphlet, open foldout

Telephone competition, pamphlet, closed foldout, verso

Telephone competition, pamphlet, p. 13

Telephone competition, pamphlet, p. 14

Telephone competition, pamphlet, p. 15

Telephone competition, pamphlet, p. 16

Telephone competition, pamphlet, p. 17

Telephone competition, pamphlet, p. 18

Telephone competition, pamphlet, p. 19

Telephone competition, pamphlet, p. 20

Telephone competition, pamphlet, p. 21

Telephone competition, pamphlet, p. 22

Telephone competition, pamphlet, p. 23

Telephone competition, pamphlet, p. 24

Telephone competition, pamphlet, p. 25

Telephone competition, pamphlet, p. 26

Telephone competition, pamphlet, p. 27

Telephone competition, pamphlet, p. 28

Telephone competition, pamphlet, p. 29

Telephone competition, pamphlet, p. 30

Telephone competition, pamphlet, p. 31

Telephone competition, pamphlet, [p. 32]

Did Reis invent a speaking telephone?, pamphlet, front cover, recto

Did Reis invent a speaking telephone?, pamphlet, front cover, verso

Did Reis invent a speaking telephone?, pamphlet, blank page

Did Reis invent a speaking telephone?, pamphlet, portrait of Philip Reis

Did Reis invent a speaking telephone?, pamphlet, p. 1

Did Reis invent a speaking telephone?, pamphlet, p. 2

Did Reis invent a speaking telephone?, pamphlet, p. 3

Did Reis invent a speaking telephone?, pamphlet, p. 4

Did Reis invent a speaking telephone?, pamphlet, p. 5

Did Reis invent a speaking telephone?, pamphlet, p. 6

Did Reis invent a speaking telephone?, pamphlet, p. 7

Did Reis invent a speaking telephone?, pamphlet, p. 8

Did Reis invent a speaking telephone?, pamphlet, p. 9

Did Reis invent a speaking telephone?, pamphlet, p. 10

Did Reis invent a speaking telephone?, pamphlet, p. 11

Did Reis invent a speaking telephone?, pamphlet, p. 12

Did Reis invent a speaking telephone?, pamphlet, p. 13

Did Reis invent a speaking telephone?, pamphlet, p. 14

Did Reis invent a speaking telephone?, pamphlet, p. 15

Did Reis invent a speaking telephone?, pamphlet, p. 16

Did Reis invent a speaking telephone?, pamphlet, p. 17

Did Reis invent a speaking telephone?, pamphlet, p. 18

Did Reis invent a speaking telephone?, pamphlet, [p. 19]

Did Reis invent a speaking telephone?, pamphlet, blank page

Did Reis invent a speaking telephone?, pamphlet, back cover, recto

Did Reis invent a speaking telephone?, pamphlet, back cover, verso

Ernst Ruhmer, Über versuche mit multiplex-telephonie, pamphlet, front cover, recto

Ernst Ruhmer, Über versuche mit multiplex-telephonie, pamphlet, front cover, verso

Ernst Ruhmer, Über versuche mit multiplex-telephonie, pamphlet, [p. 1]

Ernst Ruhmer, Über versuche mit multiplex-telephonie, pamphlet, [p. 2]

Ernst Ruhmer, Über versuche mit multiplex-telephonie, pamphlet, [p. 3]

Ernst Ruhmer, Über versuche mit multiplex-telephonie, pamphlet, [p. 4]

Ernst Ruhmer, Über versuche mit multiplex-telephonie, pamphlet, [p. 5]

Ernst Ruhmer, Über versuche mit multiplex-telephonie, pamphlet, [p. 6]

Ernst Ruhmer, Über versuche mit multiplex-telephonie, pamphlet, [p. 7]

Ernst Ruhmer, Über versuche mit multiplex-telephonie, pamphlet, [p. 8]

Ernst Ruhmer, Über versuche mit multiplex-telephonie, pamphlet, back cover, recto

Ernst Ruhmer, Über versuche mit multiplex-telephonie, pamphlet, back cover, verso

Explorations over the vibrating surfaces of telephonic diaphragms under simple impressed tones, pamphlet, front cover, recto

Explorations over the vibrating surfaces of telephonic diaphragms under simple impressed tones, pamphlet, front cover, verso

Explorations over the vibrating surfaces of telephonic diaphragms under simple impressed tones, pamphlet, title page, recto

Explorations over the vibrating surfaces of telephonic diaphragms under simple impressed tones, pamphlet, title page, verso

Explorations over the vibrating surfaces of telephonic diaphragms under simple impressed tones, pamphlet, [p. 96]

Explorations over the vibrating surfaces of telephonic diaphragms under simple impressed tones, pamphlet, p. 97

Explorations over the vibrating surfaces of telephonic diaphragms under simple impressed tones, pamphlet, p. 98

Explorations over the vibrating surfaces of telephonic diaphragms under simple impressed tones, pamphlet, p. 99

Explorations over the vibrating surfaces of telephonic diaphragms under simple impressed tones, pamphlet, p. 100

Explorations over the vibrating surfaces of telephonic diaphragms under simple impressed tones, pamphlet, p. 101

Explorations over the vibrating surfaces of telephonic diaphragms under simple impressed tones, pamphlet, p. 102

Explorations over the vibrating surfaces of telephonic diaphragms under simple impressed tones, pamphlet, p. 103

Explorations over the vibrating surfaces of telephonic diaphragms under simple impressed tones, pamphlet, p. 104

Explorations over the vibrating surfaces of telephonic diaphragms under simple impressed tones, pamphlet, p. 105

Explorations over the vibrating surfaces of telephonic diaphragms under simple impressed tones, pamphlet, p. 106

Explorations over the vibrating surfaces of telephonic diaphragms under simple impressed tones, pamphlet, p. 107

Explorations over the vibrating surfaces of telephonic diaphragms under simple impressed tones, pamphlet, p. 108

Explorations over the vibrating surfaces of telephonic diaphragms under simple impressed tones, pamphlet, p. 109

Explorations over the vibrating surfaces of telephonic diaphragms under simple impressed tones, pamphlet, p. 110

Explorations over the vibrating surfaces of telephonic diaphragms under simple impressed tones, pamphlet, p. 111

Explorations over the vibrating surfaces of telephonic diaphragms under simple impressed tones, pamphlet, p. 112

Explorations over the vibrating surfaces of telephonic diaphragms under simple impressed tones, pamphlet, p. 113

Explorations over the vibrating surfaces of telephonic diaphragms under simple impressed tones, pamphlet, p. 114

Explorations over the vibrating surfaces of telephonic diaphragms under simple impressed tones, pamphlet, p. 115

Explorations over the vibrating surfaces of telephonic diaphragms under simple impressed tones, pamphlet, p. 116

Explorations over the vibrating surfaces of telephonic diaphragms under simple impressed tones, pamphlet, p. 117

Explorations over the vibrating surfaces of telephonic diaphragms under simple impressed tones, pamphlet, p. 118

Explorations over the vibrating surfaces of telephonic diaphragms under simple impressed tones, pamphlet, p. 119

Explorations over the vibrating surfaces of telephonic diaphragms under simple impressed tones, pamphlet, p. 120

Explorations over the vibrating surfaces of telephonic diaphragms under simple impressed tones, pamphlet, p. 121

Explorations over the vibrating surfaces of telephonic diaphragms under simple impressed tones, pamphlet, p. 122

Explorations over the vibrating surfaces of telephonic diaphragms under simple impressed tones, pamphlet, p. 123

Explorations over the vibrating surfaces of telephonic diaphragms under simple impressed tones, pamphlet, p. 124

Explorations over the vibrating surfaces of telephonic diaphragms under simple impressed tones, pamphlet, p. 125

Explorations over the vibrating surfaces of telephonic diaphragms under simple impressed tones, pamphlet, p. 126

Explorations over the vibrating surfaces of telephonic diaphragms under simple impressed tones, pamphlet, p. 127

Explorations over the vibrating surfaces of telephonic diaphragms under simple impressed tones, pamphlet, p. 128

Explorations over the vibrating surfaces of telephonic diaphragms under simple impressed tones, pamphlet, p. 129

Explorations over the vibrating surfaces of telephonic diaphragms under simple impressed tones, pamphlet, p. 130

Explorations over the vibrating surfaces of telephonic diaphragms under simple impressed tones, pamphlet, p. 131

Explorations over the vibrating surfaces of telephonic diaphragms under simple impressed tones, pamphlet, p. 132

Explorations over the vibrating surfaces of telephonic diaphragms under simple impressed tones, pamphlet, p. 133

Explorations over the vibrating surfaces of telephonic diaphragms under simple impressed tones, pamphlet, p. 134

Explorations over the vibrating surfaces of telephonic diaphragms under simple impressed tones, pamphlet, p. 135

Explorations over the vibrating surfaces of telephonic diaphragms under simple impressed tones, pamphlet, p. 136

Explorations over the vibrating surfaces of telephonic diaphragms under simple impressed tones, pamphlet, [p. 137]

Explorations over the vibrating surfaces of telephonic diaphragms under simple impressed tones, pamphlet, endleaf, recto

Explorations over the vibrating surfaces of telephonic diaphragms under simple impressed tones, pamphlet, endleaf, verso

Explorations over the vibrating surfaces of telephonic diaphragms under simple impressed tones, pamphlet, endleaf, recto

Explorations over the vibrating surfaces of telephonic diaphragms under simple impressed tones, pamphlet, endleaf, verso

Explorations over the vibrating surfaces of telephonic diaphragms under simple impressed tones, pamphlet, back cover, recto

Explorations over the vibrating surfaces of telephonic diaphragms under simple impressed tones, pamphlet, back cover, verso

The effect of the induction-coil in telephonic apparatus (II.), pamphlet, front cover, recto

The effect of the induction-coil in telephonic apparatus (II.), pamphlet, front cover, verso

The effect of the induction-coil in telephonic apparatus (II.), pamphlet, p. 1

The effect of the induction-coil in telephonic apparatus (II.), pamphlet, p. 2

The effect of the induction-coil in telephonic apparatus (II.), pamphlet, p. 3

The effect of the induction-coil in telephonic apparatus (II.), pamphlet, p. 4

The effect of the induction-coil in telephonic apparatus (II.), pamphlet, p. 5

The effect of the induction-coil in telephonic apparatus (II.), pamphlet, p. 6

The effect of the induction-coil in telephonic apparatus (II.), pamphlet, circuit diagrams, recto

The effect of the induction-coil in telephonic apparatus (II.), pamphlet, circuit diagrams, verso

The effect of the induction-coil in telephonic apparatus (II.), pamphlet, p. 7

The effect of the induction-coil in telephonic apparatus (II.), pamphlet, p. 8

The effect of the induction-coil in telephonic apparatus (II.), pamphlet, p. 9

The effect of the induction-coil in telephonic apparatus (II.), pamphlet, p. 10

The effect of the induction-coil in telephonic apparatus (II.), pamphlet, p. 11

The effect of the induction-coil in telephonic apparatus (II.), pamphlet, p. 12

The effect of the induction-coil in telephonic apparatus (II.), pamphlet, back cover, recto

The effect of the induction-coil in telephonic apparatus (II.), pamphlet, back cover, verso

The effect of the induction-coil in telephonic apparatus (I.), pamphlet, front cover, recto

The effect of the induction-coil in telephonic apparatus (I.), pamphlet, front cover, verso

The effect of the induction-coil in telephonic apparatus (I.), pamphlet, p. 1

The effect of the induction-coil in telephonic apparatus (I.), pamphlet, p. 2

The effect of the induction-coil in telephonic apparatus (I.), pamphlet, p. 3

The effect of the induction-coil in telephonic apparatus (I.), pamphlet, p. 4

The effect of the induction-coil in telephonic apparatus (I.), pamphlet, blank page

The effect of the induction-coil in telephonic apparatus (I.), pamphlet, plate I

The effect of the induction-coil in telephonic apparatus (I.), pamphlet, closed foldout, verso

The effect of the induction-coil in telephonic apparatus (I.), pamphlet, open foldout, verso

The effect of the induction-coil in telephonic apparatus (I.), pamphlet, closed foldout, recto

The effect of the induction-coil in telephonic apparatus (I.), pamphlet, open foldout, recto

The effect of the induction-coil in telephonic apparatus (I.), pamphlet, p. 5

The effect of the induction-coil in telephonic apparatus (I.), pamphlet, p. 6

The effect of the induction-coil in telephonic apparatus (I.), pamphlet, p. 7

The effect of the induction-coil in telephonic apparatus (I.), pamphlet, p. 8

The effect of the induction-coil in telephonic apparatus (I.), pamphlet, p. 9

The effect of the induction-coil in telephonic apparatus (I.), pamphlet, p. 10

The effect of the induction-coil in telephonic apparatus (I.), pamphlet, p. 11

The effect of the induction-coil in telephonic apparatus (I.), pamphlet, p. 12

The effect of the induction-coil in telephonic apparatus (I.), pamphlet, p. 13

The effect of the induction-coil in telephonic apparatus (I.), pamphlet, p. 14

The American Telegraphone Company, pamphlet, front cover, recto

The American Telegraphone Company, pamphlet, front cover, verso

The American Telegraphone Company, pamphlet, [p. 3]

The American Telegraphone Company, pamphlet, [p. 4]

The American Telegraphone Company, pamphlet, p. 5

The American Telegraphone Company, pamphlet, p. 6

The American Telegraphone Company, pamphlet, p. 7

The American Telegraphone Company, pamphlet, p. 8

The American Telegraphone Company, pamphlet, p. 9

The American Telegraphone Company, pamphlet, p. 10

The American Telegraphone Company, pamphlet, p. 11

The American Telegraphone Company, pamphlet, p. 12

The American Telegraphone Company, pamphlet, p. 10

The American Telegraphone Company, pamphlet, p. 9

The American Telegraphone Company, pamphlet, p. 15

The American Telegraphone Company, pamphlet, p. 9

The American Telegraphone Company, pamphlet, p. 15

The American Telegraphone Company, pamphlet, [p. 16]

The American Telegraphone Company, pamphlet, p. 17

The American Telegraphone Company, pamphlet, p. 18

The American Telegraphone Company, pamphlet, p. 19

The American Telegraphone Company, pamphlet, [p. 20]

The American Telegraphone Company, pamphlet, p. 21

The American Telegraphone Company, pamphlet, p. 22

The American Telegraphone Company, pamphlet, p. 23

The American Telegraphone Company, pamphlet, p. 24

The acoustic principles underlying the art of telephony, pamphlet, front cover, recto

The acoustic principles underlying the art of telephony, pamphlet, front cover, verso

The acoustic principles underlying the art of telephony, pamphlet, [p. 3]

The acoustic principles underlying the art of telephony, pamphlet, p. 4

The acoustic principles underlying the art of telephony, pamphlet, p. 5

The acoustic principles underlying the art of telephony, pamphlet, p. 6

The acoustic principles underlying the art of telephony, pamphlet, p. 7

The acoustic principles underlying the art of telephony, pamphlet, p. 8

The acoustic principles underlying the art of telephony, pamphlet, p. 9

The acoustic principles underlying the art of telephony, pamphlet, p. 10

The acoustic principles underlying the art of telephony, pamphlet, p. 11

The acoustic principles underlying the art of telephony, pamphlet, p. 12

The acoustic principles underlying the art of telephony, pamphlet, p. 13

The acoustic principles underlying the art of telephony, pamphlet, p. 14

The acoustic principles underlying the art of telephony, pamphlet, p. 15

The acoustic principles underlying the art of telephony, pamphlet, p. 16

The acoustic principles underlying the art of telephony, pamphlet, p. 17

The acoustic principles underlying the art of telephony, pamphlet, p. 18

The acoustic principles underlying the art of telephony, pamphlet, p. 19

The acoustic principles underlying the art of telephony, pamphlet, p. 20

The acoustic principles underlying the art of telephony, pamphlet, p. 21

The acoustic principles underlying the art of telephony, pamphlet, p. 22

The acoustic principles underlying the art of telephony, pamphlet, p. 23

The acoustic principles underlying the art of telephony, pamphlet, p. 24

The acoustic principles underlying the art of telephony, pamphlet, p. 25

The acoustic principles underlying the art of telephony, pamphlet, p. 26

The acoustic principles underlying the art of telephony, pamphlet, p. 27

The acoustic principles underlying the art of telephony, pamphlet, p. 28

The acoustic principles underlying the art of telephony, pamphlet, p. 29

The acoustic principles underlying the art of telephony, pamphlet, p. 30

The acoustic principles underlying the art of telephony, pamphlet, p. 31

The acoustic principles underlying the art of telephony, pamphlet, p. 32

The acoustic principles underlying the art of telephony, pamphlet, p. 33

The acoustic principles underlying the art of telephony, pamphlet, p. 34

The acoustic principles underlying the art of telephony, pamphlet, p. 35

The acoustic principles underlying the art of telephony, pamphlet, end page, verso

Article related to William J. Hammer's experiments with the long distance telephone-phonograph line, clipping, recto

Article related to William J. Hammer's experiments with the long distance telephone-phonograph line, clipping, verso

Telephone relays or repeaters, clipping, recto

Telephone relays or repeaters, clipping, verso

Telephone relays or repeaters, clipping, recto

Telephone relays or repeaters, clipping, verso

Circuit diagram for Ruhmer's photographophone, clipping, recto

Circuit diagram for Ruhmer's photographophone, clipping, verso

Photograph of two photograms, recto

Photograph of two photograms, verso

Circuit diagram for Ruhmer's photographophone, recto

Circuit diagram for Ruhmer's photographophone, verso

Images and diagrams related to Thomas A. Edison's telephonic work, recto

Images and diagrams related to Thomas A. Edison's telephonic work, verso

Circuit diagram relating to telephony, recto

Circuit diagram relating to telephony, verso

Circuit diagrams relating to telephony, recto

Circuit diagrams relating to telephony, verso

Circuit diagrams relating to telephony, recto

Circuit diagrams relating to telephony, verso

Diagrams of magnets, recto

Diagrams of magnets, verso

Cycle of operations in detail with comments, typescript, [f. 1r]

Cycle of operations in detail with comments, typescript, [f. 1v]

Cycle of operations in detail with comments, typescript, [f. 2r]

Cycle of operations in detail with comments, typescript, [f. 2v]

Cycle of operations in detail with comments, typescript, [f. 3r]

Cycle of operations in detail with comments, typescript, [f. 3v]

Cycle of operations in detail with comments, typescript, [f. 4r]

Cycle of operations in detail with comments, typescript, [f. 4v]

Cycle of operations in detail with comments, typescript, [f. 5r]

Cycle of operations in detail with comments, typescript, [f. 5v]

Cycle of operations in detail with comments, typescript, [f. 6r]

Cycle of operations in detail with comments, typescript, [f. 6v]

Cycle of operations in detail with comments, typescript, end page, recto

Cycle of operations in detail with comments, typescript, end page, verso

Some new telephone apparatus, article, p. 733

Some new telephone apparatus, article, p. 734

Some new telephone apparatus, article, p. 735

Some new telephone apparatus, article, p. 736

Some new telephone apparatus, article, p. 737

Some new telephone apparatus, article, p. 738

Some new telephone apparatus, article, p. 739

Some new telephone apparatus, article, p. 740

Neuerungen auf dem Gebiete der Telephonie, pamphlet, front cover, recto

Neuerungen auf dem Gebiete der Telephonie, pamphlet, front cover, verso

Neuerungen auf dem Gebiete der Telephonie, pamphlet, [p. 1]

Neuerungen auf dem Gebiete der Telephonie, pamphlet, p. 2

Neuerungen auf dem Gebiete der Telephonie, pamphlet, p. 3

Neuerungen auf dem Gebiete der Telephonie, pamphlet, p. 4

Neuerungen auf dem Gebiete der Telephonie, pamphlet, p. 5

Neuerungen auf dem Gebiete der Telephonie, pamphlet, p. 6

Neuerungen auf dem Gebiete der Telephonie, pamphlet, back cover, recto

Neuerungen auf dem Gebiete der Telephonie, pamphlet, back cover, verso