[ Ml 3 
INDEX to the Article MECHANICS. 
A EROMETER, areometer, or liydro- 
meter, an inftrument for meafuring fpe- 
cifio gravities, 707; Snart’s, 709. 
Air, properties of, 722. 
Air-pump, theory of, 741. 
A.lembert, his contributions to the im¬ 
provement of mechanics, 623. 
Andrews’s weighing-crane, 694. 
Archimedes, his mirrors defpifed by Def- 
cartes, 618 5 the founder of theoretical 
mechanics, 6195 his fcrew pump, 761. 
Ariftotle not well informed in the theory 
of motion, 619. 
Atniofphere, 722; its properties, 723 ; to 
calculate the denfity of, 726. 
Axle-tree, Gottlieb’s anti Garnet’s, to 
avoid friftion, 675 j Barclay and Cum¬ 
ing’s, 680. 
Banks's experiments on the ftrength of 
iron, 659 
Bather’s wa.er-mill, 7663 its theory ex¬ 
plained by Defaguliers, Gregory, and 
others, 767. 
Bjrometer, 722. 3. 
Beighton’s improvement of Newcomen’s 
fleam-engine, 775. 
Befant’s water-wheel, 764, 5. 
Black’s difcovery of latent heat, 777. 
Blenkinfop’s fleam-carriage, 790, 1. 
Bofweli’s mode of impelling fhips by 
means of fleam-engines and compreffed 
air, 788. 
Braby’s cart and drag, 682, 3, 
Bramah’s hydrollatic prefs, 761. 
JBrancas, an Italian, firil ufed fleam for an 
impelling power, 769. 
Brunton’s pump for draining mines, 
7 S 3 . 4 - - 
Buchanan’s pump, 736, 7. 
Bufion’s experiments on the ftrength of 
timber, 654. 
Bunce’s pile-engine, 696. 
Carriages impelled by fleam, 790. 
Camus, a French geometrician, 622. 
Capillary attradlion, 719; Jurin’s hypo- 
thefis, 7205 Laplace’s, 721, 2. 
Capllan, eafily converted into a crane, 661. 
Cavendifh’s felf-regiflering thermometer, 
73 1 - 
Cellar-crane, 693. 
Celfius’s thermometer, 731. 
Centre of gravity, 641; in a loaded car¬ 
riage, 678 9. 
Centre of prefl'ure and centre of percuilion, 
7?4 
Chain, endlefs, 670. 
Chain pump, 754, 6. 
Chance has produced many ufeful difco- 
veries, 617. 
Clare’s experiment as to land and fea breezes, 
738. 
Clarke’s hydrometers, 707, 8. 
Clarke of Sunderland, his propofed method 
of working fhips’ pumps, 758. 
Cole’s chain pump, 735 ; hand-pump, 756, 
Collifion and percuflion, 621, 637. 
Condenfer, a kind of air-pump, 741, 2. 
Confervation of adlive forces, 622, 692. 
Cooking by fleam, 791, 2- 
Corn-mill, 684, 5 ; to work by band, 688. 
Cotes’s dodlrine of found, 739. 
Coupling or clutch boxes, 702. 
Coulomb's experiments on fritlion, &c. 624, 
673 ; and on the rigidity of ropes, 673. 
Crane, 661 3 various kinds of cranes, 603 j 
Andrews’s and Davis’s, 694. 
-C'tefibius and his pump, 742. 
Vox.. XIV. No. loii. 
Ctefiphon and Metagenes, their early in¬ 
genious contrivances, 6rg. 
Cycloids and epicycloids, how to draw, 664. 
Cy^nders, hollow and folid, ftrength of, 
%> S- . 
’s loading-crane, 694. 
Hire’s theory of the teeth of wheels, 
betille 3 thermometer, 731. 
De Luc’s thermometer, 731 3 his hydro- 
meter, 736 
Denfity defined, 6235 as diftinguiihed 
from fpecifis gravity, 701. 
Deparcieux’s memoir on the draught of 
horfes, 677, 8 ; his hydrometer, 708. 
Derham’s experiments on the velocity of 
found, 739. 
Defcartes, 618, 620. 
Dodd’s remarks on (team-boats, 786, 7• 
Dynamics illuftrated by d’Alembert, 623. 
Echo, or refledled found, 739. 
Edgeworth’s experiments on wheel car¬ 
riages, 679, 80 J his panorganon, 698- 
701. 
Emerfon’s calculations of the ftrength of 
materials, 654, 657. 
Endlefs ftrap, 669 3 chain, 670 ; fcrew. 
Epicycloids, how to form, 664- 
Equilibrium, 625. 
Euler’s difcoveries in mechanics, 62J. 
Fahrenheit’s thermometer, 728, 730. 
Fergufon’s direftions for the conftrudlion 
of water-mills, 766. , 
Fitzgerald’s patent tor improving the fleam- 
engine, never adled upon, 776. 
Flame, Angle, double, dec. its effeft in ex¬ 
panding metals, 734- 
Ploatboards for water-wheels, 763; oblique, 
7645 concave, 765. 
Florentine fpirit-thermometer, 727. 
Fluids, their nature and properties, 701 ; 
weight and prefl'ure of, 702 ; refiftance, 
710 ; motion, 712,7145 fpouting, 714 ; 
in capillary tubes, 719.722. Elaftic 
fluids, 722 5 equilibrium of, 724 ; have 
fame properties fimiiar to non-elaflic 
fluids, 724. 
Fly-wheels, 636, 7 ; 666; not r.eceflary in 
very large machines, 667 5 ufed for col- 
ledling as well as regulating, 668 3 to 
produce a rotatory motion in a fleam- 
engine, 776 5 Mr. Watt’s method, 7S1. 
Force, or power, 625. 
Foulds’s machine for fawing piles, 697, 8. 
Fourmy’s remarks on Wedgwood’s hydro¬ 
meter. 
Fridlion not to be difregarded in calcu¬ 
lating the power of a machine, 618 5 
Coulomb’s experiments, 624, 6733 
Vince’s, 673 5 how to diminiih or avoid 
fiidiion, 674 5 fri&ion-wheels, or rollers, 
674 ; 5 - 
Fulton's fleam-boats, 786. 
Galileo, his great difcoveries, 6205 his 
theory of the ftrength of materials, 653. 
Gottlieb’s anti-attrition axle-tree, 645; 
crane, 693. 
Gravimeter, for rneafuring fpecific gravi¬ 
ties, 708. 
Gravity, centre of, 64.1; general rule fer 
finding, 6443 of the lead in a wheel- 
carriage, 678. 
Gravity fpecific, 7015 inftrumtnts for 
meafuring, 706. 
Guyton’s gravimeter, 708, 9. 
Halley’s hillory of winds, 737 1 theory of 
periodical winds, 738 3 of fprings, 740. 
* 
Hafkins’s quickfilver-pump, 730. 
Hay-making machine; 689. 
Heat, its effedts in expanding different furs- 
fiances, 724. 
Hedderwick’s double pifton pump, 752. 
Uornblower’s fleam-engines, 783, 4. 
Huygens, his difcovery of the ifochronif.ix 
of the cycloid, 620. 
Hydro-mechanics, 701.722. 
Hydrometer, or aerometer ; Clarke’s, 707. 
Defaguliers’s, de Parcieux’s, and Nichot- 
fon’s, 708; .Snart’s, 707. 
Hydroftatic balance, 766, 7. 
Hydroftatics and Hydraulics, 701. 
Inclined plane, 632, 636, 646, 700. 
Jack, common and fmoke, 694; for railing 
weights, 693. 
Jarrold, Dr. recommends carts to be mount¬ 
ed on fprings, 683. 
Jekyl’s hand-pumps, 757. 
Keith’s felf-rcgiflering thermometer, 732, 
Leflie’s differential thermometer, 733. 
Lever: Varignon’s lever impoflible, 617; 
theory of the lever, 629, 633, 699. 
Line of tradlion in wheel-carriages, 677. 
Machinery, advantages of, 659; objects 
to be attended to in the conftrudlion of, 
660, 668. 
Martin’s hand-pump, 737 
Matter and body defined, 624, 637. 
Maupertuis’ “ principle of lead adlion,” 
how extended by himfelf and others, 
623- 
Mechanics, encouragement to the ftudy, 
618 j the ancients were {killed in the 
praflice, but not in the theory, which 
was firft explained by Archimedes, 6x9 ; 
progreffive hiftory, 620-624; Galileo’s 
difcoveries, followed by thole Torricelli 
and Huygens,. 620; Newton, 6223 
Euler, d’Ajembert, Maupertuis, and La¬ 
grange, 623 ; Coulomb, 624. Important 
publications on mechanics, 624. Theory 
of mechanics, 624-659; Mechanical 
powers, 629 636 ; conftrudlion of machi¬ 
nery, 657; delcription of machines, 681, 
688-701. 
Mercury refills the capillary attraflion, 
741 ; thermometrical properties of, 
728. 
Metals, Ample and mixed, tenacity of, 658, 
9 ; not to be ufed as pulleys, 670 3 ex- 
panfionof, by heat, 734. 
Mills impelled by water or wind, 6203 
wind-mills, 685 ; water-mills, 762. 
Milton’s improved ftage-coach,;68,2, 2. 
Mor.foons, 73?, 738. 
Montaigne’s contemptuous.xne.ition.of firep 
arms, 618. 
Motion, general principles of, 622 ; rotato¬ 
ry, 623 ; applied to fleam-engines, 776 ; 
hard to be defined, 625: laws of, 6163 
deductions from them, 627-6355 illuf¬ 
trated by theorems, 628, 635 ; in right 
lines, 645 ; down inclined planes, 6465 
01 pendulums, 648 ; of projeftiles, 651 ; 
fudden changes to be avoided, 668 5 re¬ 
ciprocated, 669, 671. 
Mountains, heights of, 726, 7. 
Mufchenbroek’sexperimemson the ftrength 
of materials, 656, 6575 his pyrometer, 
733 - 
Newcomen, his firft thoughts upon the 
fleam-engine, 772 ; defeription of his 
engine, 773; difference between this 
and Savery’s, 7755 improved by Beigli- 
«on, 775 - 
ic E 
Newton's 
