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The slide rule is an instrument of analog computing, which exploits the properties of logarithms, returning more complex operations (products, quotients, exponentials) to simpler operations on logarithms of their operands. These are carried out graphically by moving one or more rods graduated with a logarithmic scale.
IRS Income tax form 1955 tax table
Armillary Sphere - Astrolabe Globe
Tightly cropped horizontal image of the interior of an early 1940's vintage car, shot through the passenger side window. Visible are parts of the steering wheel, steering column, horn, dashboard, shifter. Dash color is a tan faux wood with gray trim. A round speedometer and clock are prominent features on the dash. Shot at an angle such that a small diagonal section of the amber-colored passenger side door exterior frames the bottom of the image.
Business cards indexed and organized alphabetically for communications and contacts or leads for sales to clients
Property deeds in canvas binders from a government records center
Metal gears and cogs mechanism with numbers
Old page with multiplication table.
Macro Close-up Shot of Human Fingers Turning Radio Channel Knob on Boombox Tape Player
Representing the passage of time, close-up of a sundial in the Cuban municipality of Rafael Freyre which is situated in Holguin Province.
A 1944 savings account receipt book.
Inside spread from an old British rent book dated 1981-82. The book was used by a local council to record the rent due on a property with the tenant's payments.
Old typewriter patent stamp. OCTOBER 1894
Old golf scorecard
View of linear crack in weld metal with radiograph film. Radiography is an imaging technique using X-rays, gamma rays, or similar ionizing radiation and non-ionizing radiation.
Silver Bar
close-up of electronic machine parts, digit indicator numbers
Houston, TX, USA- October 8, 2011: The trip to Las Vegas started from Houston. Here is the flight information screen of Houston Bush Intercontinental Airport.
The luopan or geomantic compass, is a Chinese magnetic compass, also known as a feng shui compass.
Old fashioned film countdown
laboratory equipment operating system control buttons.
Los Angeles, CA, USA - November 5, 2012: Music concert show event tIckets for Los Angeles area performances.
engine order telegraph in stand by position
logical data output production of solar panels
Camera Dials and Controls on an antique 35mm rangefinder type camera.
Detail of a coin-operated telephone from the 1980s, as used in Austria. Coin slot for 10, 5 and 1 Schilling.
Vintage Typerwriter Keys. On pure White Background. Clean of dust and dirt. Scratched corroded and worn to give real character.
Close-up of a scale ring on the setting wheel of an old conventional lathe.
Boeing 737 cockpit instruments at cruise
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