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M2 Radiation Calculator (Front) Given the exposure rate (rads/hr) at a given time after a nuclear detonation the calculator can be used to predicts the exposure rate at any other time. It can also estimate the radiation exposure of personnel who are in the area at some time after the explosion.

M2 Radiation Calculator (Front) Given the exposure rate (rads/hr) at a given time after a nuclear detonation the calculator can be used to predicts the exposure rate at any other time. It can also estimate the radiation exposure of personnel who are in the area at some time after the explosion.

The first eleven triangle numbers 1, 3, 6, 10, 15, 21, 28, 36, 45, 55, 66 have been identified.   Can you see a pattern? Does the pattern co...

The first eleven triangle numbers 1, 3, 6, 10, 15, 21, 28, 36, 45, 55, 66 have been identified. Can you see a pattern? Does the pattern co...

1974 Cocktail Construction Chart from the Department of Agriculture. Forest Service. Region 8. Full picture

1974 Cocktail Construction Chart from the Department of Agriculture. Forest Service. Region 8. Full picture

This instrument is in fact two instruments, and is one of the earliest known examples of Oughtred's invention, published in 1632. Oughtred's circles of proportions was invented to facilitate the use of logarithms. Instead of using Gunter's lines with a pair of dividers, this instrument, by simply moving the two rules, could make a multiplication or division more effectively. One still required printed tables of logarithms to convert numerals into logarithms, and vice versa.

This instrument is in fact two instruments, and is one of the earliest known examples of Oughtred's invention, published in 1632. Oughtred's circles of proportions was invented to facilitate the use of logarithms. Instead of using Gunter's lines with a pair of dividers, this instrument, by simply moving the two rules, could make a multiplication or division more effectively. One still required printed tables of logarithms to convert numerals into logarithms, and vice versa.

US Army ABC-M1A1 ca 1950 Radiation exposure using rotating wheel calculator. Colors are nice; remind me of Mondrian!

Vintage Infodesign [75

US Army ABC-M1A1 ca 1950 Radiation exposure using rotating wheel calculator. Colors are nice; remind me of Mondrian!

© Hans Scazigino / ETH Zurich, undated, 'Star-gazer', Observatory Zurich -  “Non est ad astra mollis e terris via.” (“There is no easy way from the Earth to the stars.”) ― Seneca

© Hans Scazigino / ETH Zurich, undated, 'Star-gazer', Observatory Zurich - “Non est ad astra mollis e terris via.” (“There is no easy way from the Earth to the stars.”) ― Seneca

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