A CATALOGUE OF INSTRUMENTS. Z7) 
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L. s; d, 
Cycloidal lever, see Emerson’s Mechanics, prop. 
20, 25. 
Compound steelyard 
An apparatus for experiments on collision 
Ditto for illustrating the composition and resolu 
tion of motion 
Pyrometers on various constructions 
With many other articles and models for expe 
riments on friction, pendulums, etc. too nu 
merous to be comprized in a small catalogue 
Instruments for Experiments in Hydrostatics and 
Hydraulics. 
Hydrostatic ballances/ from 2!. 2s. to — IO 10 O 
Nicholson’s improved hydrometers, for ascertain 
ing the specific gravity of bodies 
Ditto for examining of coin 
A concise apparatus for experiments on hydrosta 
tics — — 21 IO o 
An apparatus for shewing that fluids have weight 
Ditto for shewing that the particles of fluids exer 
cise their pressure independently one of the 
other 
Ditto to shew that fluids press in every direction 
Ditto to demonstrate the lateral pressure of fluids 
Ditto to shew that, caeteris paribus, the pressure of 
fluids is as their perpendicular height 
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