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Thompson Indicator Straight Line Motion.
Thompson Indicator Straight Line Motion Science Labs One of sixteen
mechanisms built on an A3 board equally suitable for the classroom,
drawing office or laboratory. The principal components are made from
amber coloured Perspex, pivoted with hollow rivets, and mounted on a
white melamine board for contrast and visibility. To see the mechanisms
move is far more instructive and convincing than listening to a static
lecture. The hollow rivets accept a pencil for transferring the loci of
the joints to a sheet of paper, clipped to the board.
This ingenious mechanism was invented by Thompson in order to draw a
graph of the gas pressure in an engine cylinder against the stroke of
the piston. It is derived from the Scott Russell linkage, the principal
links being AC and PB with a fixed pivot at P. The turning pair at A is
restricted to moving along an arc as the link is driven by the rod ED. E
is attached to a piston in a small cylinder connected to the expansion
chamber of the engine, (simulated by moving E by hand).
This equipment is part of a range designed to both demonstrate and
experimentally confirm basic engineering principles. Great care has been
given to each item so as to provide wide experimental scope without
unduly complicating or compromising the design. Each piece of apparatus
is self-contained and compact. Setting up time is minimal, and all
measurements are made with the simplest possible instrumentation, so
that the student involvement is purely with the engineering principles
being taught.
Each mechanism is supplied with a manual which gives full instructions
for producing the loci and applications of the assembly. The typical
graphical result is appended.
Features:
Low cost, effective teaching
Self contained
Easily seen from a distance
Mechanism clearly understandable
Loci drawn for further study
Standard mechanism for generating a straight line
Three year warranty
Range of Experiments
To determine the loci of the moving parts of the standard mechanism
To establish the characteristics of that mechanism: for example to see
which links move faster than other or whether a particular motion (such
as a straight line) is developed
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