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Earlier versions of depressors were made from balsa, pine, or redwood woods. Tongue depressors made from wood and metal exist from the American Civil War. [2]The most common modern tongue depressors are flat, thin, wooden blades, smoothed and rounded at both ends, [3] but, historically, tongue depressors have been made of a variety of materials. [4]
Insides of a slip-stick piezoelectric motor. Two piezoelectric crystals are visible that provide the mechanical torque. [1]A piezoelectric motor or piezo motor is a type of electric motor based on the change in shape of a piezoelectric material when an electric field is applied, as a consequence of the converse piezoelectric effect.
Jerome "Jerry" Hal Lemelson (July 18, 1923 – October 1, 1997) was an American engineer, inventor, and patent holder. Several of his inventions relate to warehouses, industrial robots, cordless telephones, fax machines, videocassette recorders, camcorders, and the magnetic tape drive. [1]
A dual-coil motor would alternately energize the two coils. Where the motor is adapted to produce rotary motion, the return mechanism consists of a crankshaft and flywheel. This is an extremely simple motor, such that demonstration models may be easily constructed for teaching purposes. [4] As a practical motor it has several disadvantages.
A repulsion motor is a type of electric motor which runs on alternating current (AC). It was formerly used as a traction motor for electric trains (e.g. SR Class CP and SR Class SL electric multiple units) but has been superseded by other types of motors. [citation needed] Repulsion motors are classified as single phase motors.
The motor–generator was a vertical type two-bearing machine with oil-bath bearings. Motors and generators may be coupled by a non-conductive shaft in facilities that need to closely control electromagnetic radiation, [5] or where high isolation from transient surge voltages is required.
Ahead, we’ve got 50 tongue twisters for you to try on your own, share with loved ones or with English second-language (ESL) speakers in your inner orbit to hone their tongue-tango talents.
The switched reluctance motor (SRM) is a type of reluctance motor. Unlike brushed DC motors , power is delivered to windings in the stator (case) rather than the rotor . This simplifies mechanical design because power does not have to be delivered to the moving rotor, which eliminates the need for a commutator .