The most remarkable of these are on Easter Island, where immense platforms built of dressed stone without mortar are found, together with stone images.
The coating of lime or mortar is soft and brittle, and consequently the young oysters can easily be detached with a stout knife.
Subsequent hardening of the mortar is caused by the gradual absorption of carbonic acid from the air by the lime, a skin of carbonate of lime being formed; but the action is superficial.
Those pieces are connected at theii joints or surfaces of mutual contact, either by simple pressure and friction (as in masonry with moist mortar or without mortar), by pressure and adhesion (as in masonry with cement or with hardened mortar, and timber with glue), or by the resistance of fastenings of different kinds, whether made by means of the form of the joint (as dovetails, notches, mortices and tenons) or by separate fastening pieces (as trenails, pins, spikes, nails, holdfasts, screws, bolts, rivets, hoops, straps and sockets.
Before 1405 the mortar used in Venice was made of lime from Istria, which possessed no hydraulic qualities and was consequently very perishable, a fact which to a large extent accounts for the fall of the Campanile of San Marco.
Stone and mortar are used in building, but the Abyssinian houses are of the roughest kind, being usually circular huts, ill made and thatched with grass.
In preparing the rice for use it is pounded in a wooden mortar to remove the husk, this work being almost always done by the women.
In times of scarcity the Norse peasant-farmer uses the sweetish inner bark, beaten in a mortar and ground in his primitive mill with oats or barley, to eke out a scanty supply of meal, the mixture yielding a tolerably palatable though somewhat resinous substitute for his ordinary flad-brod.
You would have almost thought they were pulling down the cursed Bastille, such wild cries they raised, as the now useless brick and mortar were being hurled into the sea.
Skoda howitzer, which is really a mortar as defined above, direction is given by means of a pointer on the mounting and a graduated arc on the bed.