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Two-pen tape chronograph, driven by self-starting electric motor, 1870-1900. The time is recorded on the tape, which is drawn past two pens using two rollers that are driven by al electric motor.

Tape Chronograph, Driven by Electric Motor, 1870-1900

1870-1900
Boulenges chronograph for the determination of the velocity of projectiles, with zinc tubes for records

Boulenges chronograph for the determination of the velocity of projectiles

Ten weights for use with screens of Bashforth's chronograph

Ten weights for use with screens of Bashforth's chronograph

Bashforth's Chronograph,used in experiments designed to measure and determine the resistance of air to the motion of projectiles, 1865-70

Bashforth's Chronograph, England, 1865-70

1865-70
Additional zinc tubes for Bouleges chronograph for the determination of the velocity of projectiles

Additional zinc tubes for Bouleges chronograph for the determination of the velocity of projectiles