Log flume

A log flume is a flume specifically constructed to transport lumber and logs down mountainous terrain to a sawmill by using flowing water. These watertight trough-like channels could be built to span a long distance across chasms and down steep mountain slopes. The use of log flumes facilitated the quick and cheap transportation of logs and thereby eliminated the need for horse- or oxen-drawn carriages on dangerous mountain trails.

Early flumes were square chutes that were prone to jams that could cause damage and required constant maintenance. In 1868, James W. Haines first built the "V" shaped log flumes that allowed a jammed log to free itself as the rising water level in the flume pushed it up. These efficient flumes consisted of 2 boards, 2 feet (0.61 m) wide, joined perpendicularly, and came in common use in the western United States during the late 19th century.

The longest log flume was reputedly the Kings River Flume in Sanger, California. Built in 1890 by the Kings River Lumber Company, it spanned over 62 miles (100 km) from the Sierra Nevada Mountains to the lumber yard and railroad depot in Sanger. Together with a constant water supply from a nearby reservoir, the flume enabled the efficient transportation of boards of lumber over deep gorges and cliffs and thereby opened up the area now known as Sequoia National Forest for clearcutting of the giant Redwood forests. Proper operation was ensured by "flume herders" who at various locations along the flume checked the flow of lumber and water.

Log flume (ride)

Log flumes (colloquially known as log rides) are amusement rides consisting of a water flume and artificial hollow logs or boats. Passengers sit in the logs, which are propelled along the flume by the flow of water.

The ride usually culminates with a rapid descent and splashdown into a body of water, which may happen more than once (normally the largest drop being just before the end). It provides people with an entertaining way to get wet and cool off on a hot summer day, with certain seating sections usually being splashed with more water for a more exciting and wet ride.

Most log flume rides have a height restriction.

History

Log flumes are a variant of the chute rides and old mill rides that were popular in the United States in the early 20th century. Shoot the Chute rides continue to be built today. Both of these types of rides took rather simple approaches to handling water flow. It was not until Karl Bacon of Arrow Development got involved and studied hydrodynamics that the use of water flow in an amusement ride was fully exploited.

Log

Log, LOG, or LoG may refer to:

Recordkeeping

Places

Russia

Slovenia

Data logger

A data logger (also datalogger or data recorder) is an electronic device that records data over time or in relation to location either with a built in instrument or sensor or via external instruments and sensors. Increasingly, but not entirely, they are based on a digital processor (or computer). They generally are small, battery powered, portable, and equipped with a microprocessor, internal memory for data storage, and sensors. Some data loggers interface with a personal computer, and use software to activate the data logger and view and analyze the collected data, while others have a local interface device (keypad, LCD) and can be used as a stand-alone device.

Data loggers vary between general purpose types for a range of measurement applications to very specific devices for measuring in one environment or application type only. It is common for general purpose types to be programmable; however, many remain as static machines with only a limited number or no changeable parameters. Electronic data loggers have replaced chart recorders in many applications.

Logarithm

In mathematics, the logarithm is the inverse operation to exponentiation. That means the logarithm of a number is the exponent to which another fixed value, the base, must be raised to produce that number. In simple cases the logarithm counts repeated multiplication. For example, the base 10 logarithm of 1000 is 3, as 10 to the power 3 is 1000 (1000 = 10 × 10 × 10 = 10³); the multiplication is repeated three times. More generally, exponentiation allows any positive real number to be raised to any real power, always producing a positive result, so the logarithm can be calculated for any two positive real numbers b and x where b is not equal to 1. The logarithm of x to base b, denoted log_b(x), is the unique real number y such that

For example, as 64 = 2⁶, we have

The logarithm to base 10 (that is b = 10) is called the common logarithm and has many applications in science and engineering. The natural logarithm has the number e (≈ 2.718) as its base; its use is widespread in mathematics and physics, because of its simpler derivative. The binary logarithm uses base 2 (that is b = 2) and is commonly used in computer science.