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Lamination
Definition:

Two or more thicknesses of stone slab adhered together at an exposed edge, usually in decorative work such as countertops, creating an aesthetic effect that suggests that the stone is thicker than it actually is. Laminated edges may be dressed or profiled to a variety of shapes for additional decorative value.


Laser
Definition:

An acronym for Light Amplification by Stimulated Emission of Radiation, which produces an intense narrow beam of coherent, monochromatic light. Lasers are used in the stone industry for a variety of cutting machine alignment aids, layout aids, and leveling instruments.


Lathe
Definition:

Any machine that spins a block or multiple blocks of material about a horizontal axis for the purposes of creating shapes that have symmetry about the axis of rotation, such as columns, balusters, and urns.


Lead Buttons
Definition:

Although not often used in modern masonry construction, these were small shims made of lead or similar malleable metal alloys used in horizontal joints to support the stones until the mortar has set.


Lewis
Definition:

A lifting device consisting of multiple sections of metal forming a tapered shape which is inserted into a dovetail shaped preparation cut into the stone. Although uncommon in current industry use, lewis lifters were frequently used for hoisting quarry blocks or for heavy, cubic sections of finished stone work. Also known as “box lewis.”


Lewis Pin
Definition:

A pin, usually with an eye at the upper end, used in pairs and fitted to holes drilled at opposing angles in cubic stones for hoisting purposes.


Limestone
Definition:

A sedimentary rock composed primarily of calcite or dolomite. The varieties of limestone used as dimension stone are usually well consolidated and exhibit a minimum of graining or bedding direction. See definition of limestone group in ASTM C119.


Line (edge) Polisher
Definition:

A large production machine which utilizes one or more spindles to achieve a finished edge profile on a piece of stone as it is fed through a conveying line.


Liners
Definition:

An additional block or strip of stone adhered and doweled to the back face of a stone panel for the purpose of providing a horizontal surface which can be supported by a shelf angle. The liner material may or may not be of the same stone species as the panel. Also known as “liner block” or “cleat.”


Lintel
Definition:

A horizontal stone spanning over the opening of a door, window, or other opening that acts as a beam to carry the weight of the wall above it.


Lippage
Definition:

The planar offset of the finished surfaces of two adjacent stone units.


Live Load
Definition:

The portion of a load on a structural member that is variable, such as occupants, furniture, traffic, and wind. See also Dead Load.


Load Cell
Definition:

An electronic device (transducer) that emits an electric signal based on the force applied to the device.


Lug Sill
Definition:

In stone masonry, a sill that projects into the jambs of a window or door opening (compare slip sill).