ClipArt ETC
The elements of the arch. A. abutments; S. springers; V. voussoirs; I. imposts; In. intrados; K. keystone; P. piers; Ex. extrados.

Arch

The elements of the arch. A. abutments; S. springers; V. voussoirs; I. imposts; In. intrados; K. keystone;…

"The degree to which the air has been exhausted from a closed vessel in which there is a partial vacuum is measured by the height to which a mercurial column in a vertical tube, whose top is connected to the vessel, will rise under the pressure of the atmosphere." —Hallock 1905

Barometer Measuring Pressure of a Partially Evacuated Vessel

"The degree to which the air has been exhausted from a closed vessel in which there is a partial vacuum…

Illustration of roof and rafter with rise and run to show pitch.

Pitch of Roof

Illustration of roof and rafter with rise and run to show pitch.

Illustration of roof and rafter with rise and run to show pitch.

Pitch of Roof

Illustration of roof and rafter with rise and run to show pitch.

Sawhorse used to length of legs.

Sawhorse

Sawhorse used to length of legs.

The sun setting over the ocean with birds flying in the air.

Sun and Ocean

The sun setting over the ocean with birds flying in the air.