Apparatus Made by Daniel Davis, Jr.
Axial Bell Engine
Axial Revolving Bar
Barlow's Wheel
Bell Engine
Compound Magnet and Electrotome
Davis, Daniel
Dip Needle
Double Helix with Interrupter
Double Beam Axial Engine
Double Revolving Magnet
Electro-Magnetic Revolving Coil
Electro-Magnetic Revolving Rectangle
Galvanometer
Galvanoscope
Heliacal Ring
Helix on Stand
Horizontal Axial Engine
Horizontal Galvanometer
Inclined Revolving Bar
Induced EMF in the Earth's B Field
 

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   The apparatus manufactured by Daniel Davis, Jr. of Boston in the dozen years before 1850 demonstrate the principles of electro-magnetism in particularly elegant fashion. Few pieces of apparatus available today can match its clarity in illustrating the principles of the motor, the generator and the induction coil. His book and catalogue, the Manual of Magnetism and the many surviving pieces of his apparatus give a good picture of the electrical knowledge in the middle of the nineteenth century. 
Interrupters or Electrotomes
 Magnet Rev. About Conducting Wire
Magnet Rev. Around Own Axis
Magnetic Model of the Earth
 Magneto-Electric Machine
Medical Magneto-Electric Apparatus
Page, Charles Grafton
Page's Revolving Armature
 Page's Revolving Magnet
Reciprocating Armature Engine
Revolving Armature Engine
Revolving Bell Engine
Revolving Ring
Revolving Rectangle
Revolving Wire Frames
Roget's Spiral (Contracting Helix)
 Telegraph
Separable Helix
 Upright Axial Engine
Upright Reciprocating Engine
Vibrating Armature Engine
 

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