by Rod Trenchard
Today's Document

titsay

❣ Chile in a Photography ❣
Misplaced Lens Cap
Peter Solarz
d e v o n
PUT YOUR BEARD IN MY MOUTH

Origami Around
Lint Roller? I Barely Know Her

shark vs the universe
trying on a metaphor
"I'm Dorothy Gale from Kansas"
Aqua Utopia|海の底で記憶を紡ぐ
Jules of Nature

Kaledo Art

No title available
noise dept.
Sade Olutola
No title available
will byers stan first human second
seen from China
seen from Canada

seen from Algeria

seen from Panama
seen from Panama
seen from Costa Rica

seen from Costa Rica
seen from United States
seen from Costa Rica
seen from Italy
seen from United States
seen from United States

seen from United States
seen from United States

seen from United States
seen from Brazil
seen from United States

seen from United States
seen from United States
seen from United States
@stylebites-blog
by Rod Trenchard
From 1904-1929, the Riefler Clock served as the first official “Time Standard” of the United States. In other words, it was the specification by which the passage of time was measured. With an accuracy of 1/100th sec/day, or 0.000222%, it still represents the peak of accuracy obtained in pendulum clocks.
Invented by Riefler in 1889, the pendulum of the clock is in a vacuum, helping to eliminate both air friction and the effects of atmospheric pressure on its buoyancy, further eliminating potential sources of time distortion. Further still, the pendulum itself is made of a metal alloy called invar, so named because of its resistance to expansion or contraction (its “invariablity”) in the event of temperature change.
This feat alone was amazing because temperature change can profoundly affect pendulum length, constricting or expanding metal accordingly. Pendulum length then affects the time measurement by effecting the Period, which is the time it takes, in seconds, for a complete cycle or oscillation (a complete back and forth swing, if you will). Represented by T, the Period and Pendulum Length, L, share the following relationship:
Where g is acceleration due to gravity. These obstacles were thus, for the most part, overcome by the Riefler clock, allowing its time keeping to be used for things like precise astronomical measurements, and cementing its place as the highest standard in time measurement for a large part of the 20th Century.
LeMond
little garden von Michael Möller © 2015
Submit a link to Lux Lit of your original work for reblog consideration. We bring art to light!
Copying hieroglyphs from the walls of old Egyptian monuments, 1927.
Plymouth Barracuda
by thats-nifty
absinthe ..
Axman
Strawberry-Coconut Cupcakes with Cream Cheese Frosting