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Resonance TubeResonance of a tube of air. The resonance of a tube of air is related to the length of the tube, its shape, and whether it has closed or open ends. Musically useful tube shapes are conical and cylindrical (see bore). A pipe that is closed at one end is said to be stopped while an open pipe is open at both ends.

or applying powders and paste like chemicals or treatments

latex gloves offer enhanced durability and a better fit

Colour filters are absorption filters made of coloured glass which absorb light in specific wavelength ranges in varying degrees and let other ranges pass to a major extent

serrated jaws which is used for creating a temporary electrical connection

a retort is a device used for distillation or dry distillation of substances

Holds the scalpel blade in position for ease of holding when in use

the mineral dawsonite

teeth models skeleton for elaborative studies

This is used to illustrate thermal expansion and cooling

a depolarizer of manganese dioxide

podiatry and various arts and crafts (called a hobby knife)

it is used to obtain waveforms when the different input signals are given

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