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Cages: Cages are optional for fixed ladders with a floor to floor elevation of less than 20' (6100 mm). They are often available for ladders with elevation changes down to 11' (3350 mm). Cages are mandated to begin between 7' and 8'(2250 mm) from the ground and extend the entire length of the ladder.
Fabric "weight" is often specified as mass per unit area, grams per square meter (gsm) or ounces per square yard. It is also sometimes specified in ounces per yard in a standard width for the particular cloth. One gram per square meter equals 0.0295 ounces per square yard; one ounce per square yard equals 33.9 grams per square meter.
Crew on a square rigged ship climbing onto the main-top using the Jacob's ladder The second type of Jacob's ladder applies to a kind of ladder found on square rigged ships. To climb above the lower mast to the topmast and above, sailors must get around the top , a platform projecting from the mast.
The safest angle for a ladder is 75.5°; if it is too shallow, the bottom of the ladder is at risk of sliding, and if it is too steep, the ladder may fall backwards. This angle is achieved by following the 4 to 1 rule for a ladder placed on a vertical wall: for every four feet of vertical height, the ladder foot should move one foot from the wall.
Grammage and basis weight, in the pulp and paper industry, are the area density of a paper product, that is, its mass per unit of area. Two ways of expressing grammage are commonly used: Expressed in grams (g) per square metre (g/m 2), regardless of its thickness . [1] This is the measure used in most parts of the world.
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Polacca-settees had a lateen sail on the foremast, a European-style square rig on the mainmast, and a gaff or lateen on the mizzenmast. polacca-settee A three-masted polacca. polacre Another name for a polacca. polacre-xebec A type of xebec with a square rig on her foremast, lateen sails on her other masts, a bowsprit, and two headsails.
Costs of construction on a per square meter (or per square foot) basis for houses can vary dramatically based on site conditions, access routes, local regulations, economies of scale (custom-designed homes are often more expensive to build) and the availability of skilled tradespeople. [13]