M

1.For a lamp bulb having a single base,the dimension from the base to the point on the bulb farthest away.2.For a lamp bulb with a base at each end,the maximum dimension from base to base.

As applied to scaffolds,the total of all loads including the working load,the weight of the scaffold,and such other loads as may be reasonably anticipated.

The largest size of aggregate particles present in sufficient quantity to affect the physical properties of concrete;generally designated by the sieve size on which the maximum amount permitted to be retained is 5 or 10% by weight.

In auto- clave curing,the time interval over which the maximum temperature is held constant.

The maximum pressure at which piping materials of the “standard” or “normally used” type are safe to  use.

The architecture of the Mayan people in Central America and Mexico from the 4th to the 15th cent.,principally of pyramid temples with steep stairways.

A corbeled arch of triangular shape common in the buildings of the Maya Indians of Yucatán.

Abbr.for “moisture content.”2.Abbr. for “metal-clad.”3.Abbr.for “mail chute.”

Same as medium curing asphalt.

Abbr.for “thousand circular mills.”See wire size.
 

Low-purity lime containing at least 15% impurities.

A structure once used for storing grain that had been ground.

Average slope (for example,of a water pipe or drain pipe).

Same as Greek key.

A shear wall that is irregular in plan.

A continuous path of travel from any point in a building or structure to the outside at ground level.

See fire escape.

An architectural drawing of an existing building,object,site,structure,or detail thereof;accurately drawn to scale on the basis of field measurements.

A prescribed procedure for conducting a measurement in such a way as to obtain reliable,reproducible results with a specified level of accuracy.

Same as batch box.

Same as smoke house.

On drawings,abbr. for “mechanical.”

A lien on privately owned real property created by state statute in favor of persons supplying labor or materials for a building or structure or improvements there of,generally for the value of the labor or materials supplied by them.In some states,a mechanic’s lien also exists for the value of professional services.Laws differ greatly among states as to the circumstances in which such a lien may arise,the sum for which it may be imposed,and the procedures whereby the sum due may be collected or the lien discharged.In most circumstances,clear title to the property cannot be obtained until the claim on which the lien is based has been settled. 

A trowel consisting of power driven metal or rubber blades for smoothing.

The process of determining particle size distribution in an aggregate or in a soil,sediment,or rock.Also see sieve analysis and particle-size distribution.

The application of plaster or mortar by pumping and spraying,rather than by hand with a trowel.

1.The keying of a plaster coat:(a) with another coat or a plaster base below or (b) as a result of plaster which is partially troweled through metal lath.2.In reinforced concrete construction,a bond between concrete and specially shaped steel reinforcing bars or rods.

The joining of two or more elements by mechanical fasteners such as bolts,rivets,or screws (but not by non- mechanical means,such as by adhesives).

Prefabricated piping for plumbing and/or heating,prefabricated duct work,and/or prefabricated electric wiring,ready for field installation with a minimum amount of labor at the site.

A precise drawing,produced with the aid of instruments,as compasses,triangles,T-squares,etc.

A room containing a permanently installed refrigeration or air-conditioning system,or major parts thereof.

The number of units of mechanical energy equal to one unit of heat,e.g.,778.2 ft-lb (107.6 kg-m) equals 1 Btu;4.187 joules equals 1 calorie.

1.A gastight and water tight joint formed by joining metal parts through a positive holding mechanical assembly (such as flanged joint,screwed joint,flared joint). 2.In piping,a joint which typically consists of: (a) a flange which is integrally cast with the bell of the pipe, (b) a rubber gasket which fits into the recess in the socket,(c) a follower ring which compresses the gasket,and (d) nuts and bolts used to tighten the joint.

A mechanism for opening and closing side-by-side windows in factories,gymnasiums,etc.either by manual operation with a hand crank,handwheel,or hand chain,or by an electric motor drive.

A property of a material that is associated with elastic and inelastic reaction when force is applied,or that involves the relationship between stress and strain.

See mechanical equipment room.

A device which automatically feeds a solid fuel (such as coal) into a combustion chamber of a boiler or furnace,and provides air for proper combustion;may include a means for automatically removing solid products of combustion.

The process of supplying outdoor air to a building or removing air from it by mechanical means,e.g.,with fans;the air which is supplied may or may not be heated,cooled,or air-conditioned.

A chimney in which the draft is produced,wholly or partly,by an auxiliary blower that either forces air into the furnace or draws the gases and smoke from the furnace and discharges them into the chimney.

A water-cooling tower in which air is moved through the tower by one or more fans built into the tower.

A cellular plastic whose structure is produced by physically incorporated gases.
 

A nail which is zinc-coated by tumbling in a container with powdered zinc and small glass beads.

Devices in mechanical parking garages that are used exclusively for conveying automobiles,by means of a power-driven transfer device,directly into parking spaces or cubicles.
 

On drawings,abbr.for medium.

1.An ornamental plaque (often round,oval,or square,but may be of any other form) representing an object or design in relief,such as a figure,flower, or head.2.A ceiling ornament,often cast in plaster,at the center of which is often hung a chandelier or luminaire;also called a rose or rosette
 

A molding consisting of a series of medallions,found in the later and richer examples of Norman architecture.

A storage cabinet for medical supplies,toilet articles,and the like.

Architecture of the European Middle Ages,from about the 5th to the 15th centuries.Found,in particular,in the pre-Romanesque,Romanesque,and Gothic styles.

The liquid or semiliquid ingredient of a paint which controls ease of application,appearance,gloss,adhesion,durability,and chemical inertness.

Fiberboard having a density of from 30 to 50 lb per cu ft (480 to 800 kg per cu m);used for structural building applications,coreboards, etc.