four layers

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Valentine - Mechanical -- four layers, merrymaking

Valentine - Mechanical -- four layers, merrymaking

Public domain photograph of stamp object, free to use, no copyright restrictions image - Picryl description

Camouflage - Miscellaneous - Shows the open mouth of the emplacement which is unconcealed during fire. The difficulty of concealing the square shadow of this kindis great where it is impossible to dig the gun down below the level of the ground. The photograph also shows the protection considered sufficient against 105's. It consists of a layer of heavy timbers, four layers of sand bags, a bursting layer of brick with light rails, and a lyaer of sod

Camouflage - Miscellaneous - Shows the open mouth of the emplacement w...

Photographer: Major Francis T. Colby, U.S.A. Camouflage - Miscellaneous Public domain photograph of a tunnel, arch structure, free to use, no copyright restrictions image - Picryl description

Gemini-Titan (GT)-8 - Lightweight Suit - MSC

Gemini-Titan (GT)-8 - Lightweight Suit - MSC

S65-60035 (6 Dec. 1965) --- The new light-weight spacesuit planned for possible use during the Gemini-7 mission is modeled by Fred R. Spross, Gemini Support Office, Crew Systems Division. The spacesuit weighs 1... More

Ganymede G1 & G2 Encounters - Interior of Ganymede

Ganymede G1 & G2 Encounters - Interior of Ganymede

NASA's Voyager images are used to create a global view of Ganymede. The cut-out reveals the interior structure of this icy moon. This structure consists of four layers based on measurements of Ganymede's gravit... More

CAPE CANAVERAL, Fla. – The gravel crawlerway is seen as if from a crawler transporter approaching Launch Complex 39 pad A at the Kennedy Space Center in Florida. The crawlerways are 130 feet wide, about the size of an 8-lane freeway. The river rock paths have been used since 1966 to move launch vehicles from the Vehicle Assembly Building, or VAB, along the 3.4-mile path to pad A and 6.8 miles to pad B.    The crawlerways were originally built to support transporting Apollo Saturn V rockets to the launch pads. The crawlerways were again used during the Space Shuttle Program moving the 4.5 million-pound shuttles mounted on an 8-million-pound mobile launcher platform atop a six-million-pound crawler transporter -- totaling an 18.5-million-pound vehicle lumbering along to the pad. The paths are specially constructed with four layers. The top is eight inches thick on curves and four inches on straightaway sections. Then there is a four-foot layer of graded, crushed stone. Beneath that is 2.5 feet of fill, followed by one foot of compact fill. Plans call for the crawlerways to be used in the future for transporting launch vehicles from the VAB to pads A and B. For more information, visit http://www.nasa.gov/transition Photo credit: NASA/Kim Shiflett KSC-2012-3982

CAPE CANAVERAL, Fla. – The gravel crawlerway is seen as if from a craw...

CAPE CANAVERAL, Fla. – The gravel crawlerway is seen as if from a crawler transporter approaching Launch Complex 39 pad A at the Kennedy Space Center in Florida. The crawlerways are 130 feet wide, about the siz... More

CAPE CANAVERAL, Fla. – The gravel crawlerway is seen as if from a crawler transporter making a turn to approach Launch Complex 39 pad A at the Kennedy Space Center in Florida. The crawlerways are 130 feet wide, about the size of an 8-lane freeway. The river rock paths have been used since 1966 to move launch vehicles from the Vehicle Assembly Building, or VAB, along the 3.4-mile path to pad A and 6.8 miles to pad B.      The crawlerways were originally built to support transporting Apollo Saturn V rockets to the launch pads. The crawlerways were again used during the Space Shuttle Program moving the 4.5 million-pound shuttles mounted on an 8-million-pound mobile launcher platform atop a six-million-pound crawler transporter -- totaling an 18.5-million-pound vehicle lumbering along to the pad. The paths are specially constructed with four layers. The top is eight inches thick on curves and four inches on straightaway sections. Then there is a four-foot layer of graded, crushed stone. Beneath that is 2.5 feet of fill, followed by one foot of compact fill. Plans call for the crawlerways to be used in the future for transporting launch vehicles from the VAB to pads A and B. For more information, visit http://www.nasa.gov/transition Photo credit: NASA/Kim Shiflett KSC-2012-3983

CAPE CANAVERAL, Fla. – The gravel crawlerway is seen as if from a craw...

CAPE CANAVERAL, Fla. – The gravel crawlerway is seen as if from a crawler transporter making a turn to approach Launch Complex 39 pad A at the Kennedy Space Center in Florida. The crawlerways are 130 feet wide,... More

CAPE CANAVERAL, Fla. – The gravel crawlerway is seen as if from a crawler transporter making the approach to Launch Complex 39 pad A at the Kennedy Space Center in Florida. The crawlerways are 130 feet wide, about the size of an 8-lane freeway. The river rock paths have been used since 1966 to move launch vehicles from the Vehicle Assembly Building, or VAB, along the 3.4-mile path to pad A and 6.8 miles to pad B.      The crawlerways were originally built to support transporting Apollo Saturn V rockets to the launch pads. The crawlerways were again used during the Space Shuttle Program moving the 4.5 million-pound shuttles mounted on an 8-million-pound mobile launcher platform atop a six-million-pound crawler transporter -- totaling an 18.5-million-pound vehicle lumbering along to the pad. The paths are specially constructed with four layers. The top is eight inches thick on curves and four inches on straightaway sections. Then there is a four-foot layer of graded, crushed stone. Beneath that is 2.5 feet of fill, followed by one foot of compact fill. Plans call for the crawlerways to be used in the future for transporting launch vehicles from the VAB to pads A and B. For more information, visit http://www.nasa.gov/transition Photo credit: NASA/Kim Shiflett KSC-2012-3984

CAPE CANAVERAL, Fla. – The gravel crawlerway is seen as if from a craw...

CAPE CANAVERAL, Fla. – The gravel crawlerway is seen as if from a crawler transporter making the approach to Launch Complex 39 pad A at the Kennedy Space Center in Florida. The crawlerways are 130 feet wide, ab... More

CAPE CANAVERAL, Fla. – The gravel crawlerway is seen as if from a crawler transporter approaching Launch Complex 39 pad A at the Kennedy Space Center in Florida. The crawlerways are 130 feet wide, about the size of an 8-lane freeway. The river rock paths have been used since 1966 to move launch vehicles from the Vehicle Assembly Building, or VAB, along the 3.4-mile path to pad A and 6.8 miles to pad B.      The crawlerways were originally built to support transporting Apollo Saturn V rockets to the launch pads. The crawlerways were again used during the Space Shuttle Program moving the 4.5 million-pound shuttles mounted on an 8-million-pound mobile launcher platform atop a six-million-pound crawler transporter -- totaling an 18.5-million-pound vehicle lumbering along to the pad. The paths are specially constructed with four layers. The top is eight inches thick on curves and four inches on straightaway sections. Then there is a four-foot layer of graded, crushed stone. Beneath that is 2.5 feet of fill, followed by one foot of compact fill. Plans call for the crawlerways to be used in the future for transporting launch vehicles from the VAB to pads A and B. For more information, visit http://www.nasa.gov/transition Photo credit: NASA/Kim Shiflett KSC-2012-3981

CAPE CANAVERAL, Fla. – The gravel crawlerway is seen as if from a craw...

CAPE CANAVERAL, Fla. – The gravel crawlerway is seen as if from a crawler transporter approaching Launch Complex 39 pad A at the Kennedy Space Center in Florida. The crawlerways are 130 feet wide, about the siz... More