A technique for insulating and sealing exterior walls that reduces vapor diffusion through air leakage points by installing pre-cut blocks of rigid foam insulation over floor joists, sheet subfloor, and top plates before drywall is installed.

Operation mode of a communication circuit in which one end can only transmit and the other end can only receive.

A magnetometer of the electromagnetic type which is used to measure the horizontal intensity of the earth's magnetic field.

The type of alternative current generated by alternating current generators, rotary inverters, and solid-state inverters.

To call out.

The piston only compresses air with its stroke in one direction.

One layer of glass in a window frame. It has very little insulating value (R-1) and provides only a thin barrier to the outside and can account for considerable heat loss and gain.

A type of radio carried on a boat to transmit long distances.

Machines having only one impeller.

Machines in which air or gas is compressed in each cylinder or casing from initial intake pressure to final discharge pressure.

To cast off all but one remaining line.

In reference to solar photovoltaic devices, a material that is composed of a single crystal or a few large crystals.

A generator with a single armature coil, which may have many turns and the alternating current output consists of a succession of cycles.

A recording siphon barometer.

A mercury barometer in which the tube is U-shaped and the upper and lower mercury surfaces have the same diameter.

Any paint gun which uses air flowing over an opening to create a vacuum to draw paint up a tube to be atomized.

Mythical sea nymphs who charmed men with their melodious voices. Enchanted, the men would stop all work to listen and they would ultimately die of starvation because of their inability to sail any further.

Special Intermediate Survey

Two iron flatsided hooks reversed to one another.

A thermometer, invented by James Six in 1782, which simultaneously indicates the maximum and minimum temperatures attained during a given interval of time. A U-tube min/max thermometer