You mean like 15 or 20 years ago? Casket material and design has hardly changed since then.
Or do you mean around the beginning of the 20th century (1900's)? What are you talking about?
For metal caskets usually a crank. With old style wooden caskets, the lid often has to be unscrewed.
Only those caskets are air (and water) tight which are "sealer" caskets, meaning that they are provided with a rubber like sealing gasket between the lid and the base of the caskets. Usually only metal caskets can be sealer caskets.
"Glass sealer" caskets (protective caskets with an inner glass lid) are an older type of "sealer caskets" (caskets providing an air and watertight seal). Later (for example in the Gulf War) the remains of soldiers were shipped back in glassless "gasket sealer" caskets.
One can find caskets for sale at mortuaries and funeral supply stores, for example Costco. Caskets are also for sale at Sears, Walmart, and Caskets By Design.
they used ivory for boxes and caskets today we use ivory for piano keys
Only those caskets are air (and water) tight which are "sealer" caskets, meaning that they are provided with a rubber like sealing gasket between the lid and the base of the caskets. Usually only metal caskets can be sealer caskets.
Probably some years after the Second World War. Before that, usually rather expensive glass sealer caskets were used if a "protective" casket was requested. After the war, the Batesville Casket Company pioneered the use of reasonably priced gasket sealer caskets.
In the US, many caskets have colored interiors. The former Marsellus Casket Company - famous maker of hardwood caskets - pioneered the use of colored interiors already in the 1920s.
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They didnt!
Usually yes - as long as one compares caskets of similar design, similar thickness of wood and similar interiors.
While the metal strength and durability of steel caskets is measured in gauge (ga.) - indicating the thickness of the metal - the strength of copper and bronze caskets is usually measured by the weight of the wrought metal sheets from which the caskets are welded together. The sheets used in standard solid copper or bronze caskets have a weight of 32 ounces per square foot, while more expensive caskets use 48oz sheets. Most 32 oz caskets have an empty weight between 200 and 300 lbs, most 48oz caskets between 250 and 350 lbs. In rare cases, 64 oz copper sheets or 96 oz bronze sheets are used for luxury caskets. Exceptions confirm the rule: the measurement in ounces per square foot is not used for top of the line copper and bronze caskets: copper deposit caskets (not welded from copper sheets, but made by a time consuming electrolytic process) usually have a wall thickness of 1/8" (3mm) and an empty weight of approximately 600 to 800 lbs, while cast bronze caskets (which are cast from molten bronze like bells) usually have a weight between 1,000 and 1,200 lbs, which equals that of solid bronze caskets made from sheets with a weight of at least 96 oz.