Semi Passive Alkalinity Doser. This is a tank containing limestone chips or pebbles, or some other alkaline chemical. An attached water wheel drives the feed mechanism so the does of chemical is compatible with the amount of water flowing by. The purpose is to provide sufficient alkalinity to permit the removal of iron and aluminum in a settling pond. A possible treatment unit for TP3.

An acronym for Simple Plastic Airplane Design. In the most basic design, SPADs are airplanes with corrogated plastic (Coroplast) wings and gutterpipe fuselages. More complicated and unconventional airframes can be made completely of Corrogated plastic. U-channel aluminum fuselages are common. Report this Word See also: Coroplast Added by: casniffer

Servicio Preventivo y Asistencial de Drogodependencias

A nail one or two inches long, of iron, brass, tin, or tinner iron, with a hole through the flattened head, used to mark stations in underground surveying.

A spad is a flat spike hammered into a wooden plug anchored in a hole drilled into the mine ceiling from which is threaded a plumbline. The spad is an underground survey station similar to the use of stakes in marking survey points on the surface. A pointer spad, or sight spad, is a station that allows a mine foreman to visually align entries or breaks from the main spad.

Signal Passed at Danger

This is a modern term. One would imagine that the LNWR would use the term SACK in relation to a driver doing this! In 1998 over 630 signals were passed at danger. The vast majority were passed by a few metres and stopped in the overlap. Most were caused by slippery rail conditions affecting braking. Some were caused by signals changing to red a short time before the train approached it because the signal had failed. Signals, like most railway equipment, are designed to fail-safe, and will display a red aspect if they fail. A few, however, were due to drivers failing to observe the red signal.

a device capable of detecting the arrival of a single photon and exhibits superior sensitivity, dynamic range, and noise performance with very low power dissipation

The purpose of Spad is to create a database which contains results and records for a large number of competitions in many sports. Two programs are provided ; one for browsing the database and one for editing and modifying data.