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Slide rule math instrument set to the value pi
Electric car batteries in a row in repair shop.
Vintage old folding ruler. Isolated on white background.
close up of tab keys on an antique and weathered adding machine, outdoors on display and for sale at a junkyard, Long Island, New York
An old music-roll, used to play a piano or organ automaticly
electric power systems
Antique spyglass for observation from the ship. Old objects of the 18th century era, reenactment of events
Vintage analog camera close up of ASA Dial wheel
Barograph. The barometer is a self-recording device for continuous recording. High quality photo
Vintage computing machine close-up image with typ buttons. Used in the pre Computer Era.
Time lines in an abstract spiral
Representing the passage of time, close-up of a sundial in the Cuban municipality of Rafael Freyre which is situated in Holguin Province.
The first model of the computational mechanism is an arithmometer. A prototype of a mechanical computer for calculating numbers.
Close-up of vintage electronic components, including vacuum tubes, in an old radio or amplifier.
Vintage old folding ruler. Isolated on white background.
Number 50 Pattern Design on Banknote
Vacuum tube close-up image with several tubes. They were crucial to the development of radio, television, radar, sound recording and reproduction, long-distance telephone networks, and analog and early digital computers.
Armillary Sphere - Astrolabe Globe
Portable Gas Stove for Camping
View of antique ohmmeter device
Mechanical counter
Camera Dials and Controls on an antique 35mm rangefinder type camera.
Front of an expired, obsolete Dutch ID / passport, issued during WW2, in november 1941
Ship telegraph in the engine room, close-up.
Mechanical parts
Copper busbar.
Optical tool with mirrors and magnifying glasses
An old dial within the controls of a carillon device.
Annual rings on a cross-section of a tree trunk.
Free Images: "bestof:Slide rule made for Davidson Catalysts, Aristo Darmstadt Nr. 867U, mid 1900s - National Electronics Museum - DSC00083.JPG en Exhibit in the National Electronics"
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