Knight's Mechanical Encyclopedia, H., High-press′ure a-larm′.

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19th-Century American

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entry

Table of Contents:

Hack-bar′row.

Hack′ing-out knife.

Hack′le; Heck′le ; Hatch′el .

Hack′ling-ma-chine′.

Had′ley's Quad′rant.

Haem′a-dyn-a-mom′e-ter.

Hair-clip′ping shears.

Hair-cloth loom.

Hair-com′pass.

Hair-di-vid′er.

Hair-pen′cil.

Hair-pick′er.

Hair-py-ri′tes.

Hair-rope Pick′er.

Hair-trig′ger.

Hair-work′ing.

Half-bas′tion.

Half-bind′ing.

Half-breadth plan.

Half-breadth staff.

Half-capo-niere′.

Half-fur′nace.

Half-head ′er.

Half-high Fur′nace.

Half-lat′tice Gird′er.

Half-mer′lon.

Half-min′ute glass.

Half-moon knife.

Half-prin′ci-pal.

Half-re-lief′.

Half-round bit.

Half-round file.

Half-stuff ma-chine′.

Half-sunk′en Battery.

Half-thick file.

Half-tim′ber.

Half-turn′ing bolt.

Hal ′lo-type.

Ha-lom′e-ter.

Hal ′o-scope.

Halv′ing-belt.

Hame-fas′ ten -er.

Ham ′mer-axe.

Ham ′mer-beam roof.

Ham ′mer-cap.

Ham ′mer-catcher.

Ham ′mer-cloth.

Ham ′mer-harden-ing.

Ham ′mer-helve.

Ham ′mer-joint.

Ham ′mer-mark.

Ham ′mer-nail.

Ham ′mer-spring.

Ham ′mer-tail spring.

Ham ′mock-net-tings.

Hand, Arti-fi′cial.

Hand-bar′row.

Hand-cul′ti-vator.

Hand feed-pump.

Hand-grap′nel.

Hand-ham′mer.

Hand-let′ter.

Hand-mag′ni-fier.

Hand-peg′ger.

Hand-plant′er.

Hand-rail plane.

Hand Sew′ing-ma-chine′.

Hand-shut′tle.

Hand′spike-ring.

Hand Spin′ning-ma-chine′.

Hand-wheel lathe.

Hang′ing-bridge.

Hang′ing-but′tress.

Hang′ing-com′pass.

Hang′ing-knee.

Hang′ing-ma-chine′.

Hang′ing-post.

Hang′ing-side.

Hang′ing-stile.

Hang′ing-tie.

Hang′ing-tool.

Hang′ing-valve.

Hard′en-ing-fur′nace.

Hard′en-ing-kiln.

Hard′en-ing-skin.

Hard-fin′ish.

Hard Por′ce-lain.

Hard Rub′ber.

Hard Sol ′der.

Har-mon′i-ca.

Har-mon′i-phon.

Har-mo′ni-um.

Harmo-nom′e-ter.

Har′ness-bell.

Har′ness-board.

Har′ness-cask.

Har′ness-clamp.

Har′ness-hook

Har′ness, leath′er.

Har′ness-pad.

Har′ness-room.

Harness-sad′dle.

Har′ness-snap.

Harp′ing-i′ron.

Har-poon′--fork.

Har-poon′--rock′et.

Harp′si-chord.

Har′vest-er-cut′ter grind-er.

Har′vest-ing-ma-chine′.

Has′sock-fil′ler.

Has′ ten -er.

Hat-block′ing ma-chine′.

Hat-bod′y Print′er.

Hat-bod′y Siz′ing-ma-chine′.

Hat-brim Trim′mer.

Hat-brush′ing ma-chine′.

Hat-con-form′a-tor.

Hat-em-boss′ing.

Hat-felt′ing.

Hat-fin′ish-ing.

Hat-form′ing ma-chine′.

Hat-full′ing ma-chine′.

Hat-hard′--en-ing Machine′.

Hat-i′ron-ing ma-chine′.

Hat-mak′ers Bat′ter-y.

Hat-meas′ure.

Hat-nap′ping ma-chine′.

Hat-per′fo-rating ma-chine′.

Hat-plank′ing.

Hat-poun′cing ma-chine′.

Hat-press′ing ma-chine′.

Hat-pro-tect′or.

Hat-shap′ing ma-chine′.

Hat-stiff′en-ing ma-chine′.

Hat-stretch′ing ma-chine′.

Hat-tip Stretch′er.

Hat-ven′tilator.

Hat-weav′ing loom.

Haul — up gear.

Hawk-bill-tooth saw.

Haw ′ser-clamp.

Haw ′ser—laid.

Hay —band ma-chine′.

Hay —cut′ter.

Hay —el′e-vator.

Hay —load′er.

Hay —mak′ing Fur′nace.

Hay Rak′er and Cock′er.

Hay —rak′er and Load′er .

Hay —spread′er.

Hay ′stack—boil′er.

Hay —stack′er.

Hay —ted′der.

Hay —un-load′er.

Head′ing—chis′el.

Head′ing—cir′cler.

Head′ing—course.

Head′ing—joint.

Head′ing—knife.

Head′ing—ma-chine′.

Head′ing—tool.

Head—mold′--ing.

Head—tim′ber.

Hear′ing—trumpet.

Hearth—brush.

Hearth—plate.

Heat—en′gine.

Heat′ing—appa-ra′tus.

Heat′ing—pan.

Heat′ing—stove.

Heat′ing-surface.

Heat′ing-tube.

Heat-reg′u-lator.

Heck ′ling-ma-chine′.

Hed′dle-hook.

Hedge-clip′per.

Hedge-plan′ter.

Hedg′ing-tools.

Heel-breast′-- ing ma-chine′.

Heel-bur′nish-ing ma-chine′.

Heel-cut ′ter.

Heel-face Dress′er.

Heel-ma-chine′.

Heel-pol′ish-ing ma-chine′.

Heel-seat Cut′ter.

Heel-trim′mer.

Hel′i-cal spring.

Hel′i-co-graph.

He′li-o-chrome.

He′li-o-chromo-type.

He′li-o-graph.

He′li-o-graphic En-grav′ing.

Heli-om′e-ter.

He′li-o-scope.

He′li-o-stat.

He′li-o-trope.

He′li-o-type.

Hel-len′o-type.

Hel′met; helm .

Helve-ham′mer.

Hema-drom′e-ter.

Hema-dyna-mom′e-ter.

Hemi-spheres of Mag′de-burg.

Hemor-rhoid′alsyr′inge.

Hemp-har′vest-er.

Her-ba′ri-um.

Her-maph′ro-dite.

Her′ni-al Sup-port′er.

Her′ring-bone.

Her-schel′i — an Tel′e-scope.

Hete-rod′ro-mous Lev′ers.

Hide-hand′ler.

Hide-scrap′er.

Hide-shav′ing ma-chine′.

Hide-stretch′er.

Hide-work′er.

High-fur′nace.

High-press′ure a-larm′.

High-press′ure En′gine.

High-re-lief′.

High-warp loom.

Hill ′o-type.

Hill ′side-plow.

Hind-car′riage.

Hinge-mak′ing ma-chine′.

Hip-poc′ra-tes sleeve.

Hitch ′ing-clamp.

Hitch ′ing-post.

Hoard ; hoarding .

Hod-el′e-vator.

Ho-dom′e-ter.

Hoe′ing ma-chine′.

Hog-el′e-vator.

Hog′ger-pipe.

Hog′ger-pump.

Hog-scald′ing tub.

Hog's-nose Trim′mer.

Hoist′ing-en-gine.

Hoist′ing-jack.

Hoist′ing-ma-chine′.

Hoist′ing-tack′le.

Hold-back hook.

Hold′ing-down bolt.

Hold′ing — up Ham ′mer.

Hol′low-adze.

Hol′low-au′ger.

Hol′low-au′ger bit.

Hol′low-drift.

Hol′low-edge file.

Hol′low-ing and Back′ing-ma-chine′ .

Hol′low-ing-knife.

Hol′low-ing-plane.

Hol′low-joint wire.

Hol′low-man′drel lathe.

Hol′low-new′el.

Hol′low-plane.

Hol′low-punch.

Hol′low-quoin.

Hol′low-rail.

Hol′lows and rounds.

Hol′low-ware.

Ho-lom′e-ter.

Hol′o-pho′tal light.

Hol-o-ster′ic Ba-rom′e-ter.

Hom′i-ny-mill.

Hon ′ey-comb.

Hon ′ey-strain′er.

Hon ′i-ton-lace.

Hood ′ing-end.

Hood-mold′ing.

Hood-quar′ter.

Hoof-par′ing knife.

Hoof-spread′er.

Hooke ′s Gear′ing.

Hooke ′s joint.

Hook′ing-frame.

Hook-mo′tion.

Hoop-bend ′ing ma-chine′.

Hoop-coil′ing ma-chine′.

Hoop-crimp′ing ma-chine′.

Hoop-cut ′ting ma-chine′.

Hoop-dress′ing ma-chine′.

Hoop-driv′er.

Hoop-plan′ing ma-chine′.

Hoop-punch′ing ma-chine′.

Hoop-rack′ing ma-chine′.

Hoop-riv′ing ma-chine′.

Hoop-saw′ing ma-chine′.

Hoopshav′ing Machine′.

Hoop Splay′ing and Bend′ing ma-chine′.

Hoop-split′ting ma-chine′.

Hop′per-cock.

Hop-pick′--er.

Ho-ri′zon, Ar-ti-ficial.

Ho-ri′zon-glasses.

Hor-i-zontal Di′al.

Hor-i-zon′tal drill.

Hor-i-zon′tal es-cape′ment.

Hor-i-zon′--tal lathe.

Hor-i-zon′tal mill.

Hor-i-zon′tal Steamengine.

Hor-i-zon′tal Wa′--ter-wheel.

Horn , Ar-ti-fi′cial.

Horn-mer′cu-ry.

Horn-quick′sil-ver.

Horn-sil′ver.

Hor ′o-log′ic-al In′stru-ments.

Ho-rom′e-ter.

Hor ′o-scope.

Horse-ar-til′ler-y.

Horse-cap′stan.

Horse-clip′ping tool.

Horse-col′lar.

Horse ferry -boat.

Horse hay-fork.

Horse-hitch′ing hook.

Horse-hold′er.

Horse-lit′ter.

Horse-pow′er.

Horse-rail′road.

Horse′shoe-an′vil.

Horse′shoe-clamp.

Horse′shoe-ma-chine′.

Horse′shoe-mag′net.

Horse′shoe-nail.

Horse′shoe nail-ma-chine′.

Horse′shoe-rack.

Hors′ing-block.

Hors′ing-i′ron.

Hose-car′riage.

Hose-car′ri-er.

Hose-coup′ling.

Hose-fit′tings.

Hose-jump′er.

Hose-mak′ing ma-chine′.

Hose-protect′or.

Hos ′pi-tal-wagon.

Hot-air Engine.

Hot-air Fur′nace.

Hot-blast Fur′nace.

Ho-tel′--car.

Hot-gild′ing.

Hot-wa′ter Faucet.

Hot-wa′ter Heat′ing-appa-ra′tus.

Hot-water pipe.

Hot-wa′ter pump.

House-mov′ing.

Hous′ing-bear′ers.

Hub′ble-bub′ble.

Hub-bor′ing ma-chine′.

Hub-cen′ter-ing ma-chine′.

Hub-mor′tis-ing ma-chine′.

Hub-turn′ing ma-chine′.

Hull ′ingma-chine′.

Hum′mel-ing-ma-chine′.

Hun-ga′ri — an Leath′er.

Hun-ga′ri — an ma-chine′.

Hunt ′er's screw.

Hunt ′ing-cog.

Hunt ′ing-horn.

Hunt ′ing-watch.

Hur′dle-nail.

Hurdy-gur′dy.

Hur′ri-cane-deck.

Husk-hack′ler.

Husk′ing-glove.

Husk′ing-peg.

Huy-ghen′i — an eye-piece.

Hy-al′o-graph.

Hy-drau′lic belt.

Hy-drau′lic block.

Hy-drau′lic brush.

Hy-drau′lic cane.

Hy-drau′lic Ce-ment′.

Hy-drau′lic clock.

Hy-drau′lic con-dens′er.

Hy-drau′lic crane.

Hy-drau′lic dock.

Hy-drau′lic El′e-vator.

Hy-drau′lic En′gine.

Hy-drau′lic Gov′ern-or.

Hy-drau′lic hoist.

Hy-drau′lic In′di-cator.

Hy-drau′lic lift.

Hy-drau′lic Lift′ing-jack.

Hy-drau′lic lime.

Hy-drau′lic main.

Hy-drau′lic Mining.

Hy-drau′lic Mor′tar.

Hy-drau′lic Mo′tor.

Hy-drau′lic Noz′zle.

Hy-drau′li-con.

Hy-drau′lic Piv′ot.

Hy-drau′lic Plat′form-lift.

Hy-drau′lic press.

Hy-drau′lic pro-pel′ler.

Hy-drau′lic Pull′ing-jack.

Hy-drau′lic punch.

Hy-drau′lic rail-bend′er.

Hy-drau′lic ram.

Hy-drau′lic shaft-straighten-er.

Hy-drau′lic shears.

Hy-drau′lic slip.

Hy-drau′lic spring-tester.

Hy-drau′lic Tele-graph.

Hy-drau′lic valve.

Hy-drau′lic wheel.

Hy′dro-ba-rom′e-ter.

Hy′dro-car′bon-burn′er.

Hydro-car′bon-fur′nace.

Hydro-car′bon-stove.

Hy′dro-e-lec′tric Batter-y.

Hy′dro-e-lec′tric ma-chine′.

Hy′dro-ex-tract′or.

Hy′dro-genlamp.

Hy′dro-met′al-lurgy.

Hy′dro-met′ric Pend′u-lum.

Hydro-met′ro-graph.

Hy′dro-phore.

Hy′dro-scope.

Hy′dro-stat′ic arch.

Hy′dro-stat′ic Bal′ance.

Hy′dro-stat′ic Bal′ing-press.

Hydro-static bed.

Hydro-stat′ic Bel′lows.

Hy′dro-stat′ic lamp.

Hy′dro-stat′ic Lev′el.

Hydro-static press.

Hy′dro-stat′ic-press pump.

Hy-et′o-graph.

Hy′gro-graph.

Hy′grome-ter.

Hy′gro-met′ric Bal′ance.

Hy′gro-scope.

Hy-pae′thrum.

Hy′per-thy′rum; Hyper-thy′non .

Hy′po-der′mic Syr′inge.

Hy′po-tra-che′li-um.

Hyp-som′e-ter.

Hys′ter-om′e-ter.

Hyster′o-tome.

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High-press′ure a-larm′.

The object of this device, as the name indicates, is to give notice and prevent an explosion of a steam-generator. It consists mainly of two classes: 1. Fusible plugs in the side of the boiler, which give way when a certain heat is attained, and allow the steam to escape. 2. Valves which open when the pressure becomes excessive, and allow exit to steam, which blows an alarmwhistle. The first depend upon temperature, the second upon pressure. Pressure and temperature bear a certain ratio to each other.

1. Ashcroft's patents of March 19, 1850, and February 18, 1851, refer to methods for the protection and insulation of the plug which is destined to give way at a certain temperature and relieve the boiler.

The patent of C. Evans, May 8, 1834, describes the use and operation of the fusible plug, which is composed usually of lead and tin, with the addition, in some cases, of bismuth. The ingredients are so proportioned as to melt at the heat at which it is desired that notice shall be given. It is used as a low-water detector, as well as to indicate high pressure, and for protection of the boiler may be placed at that portion which is most likely to be unduly heated when the water is low. See fusible alloys, p. 62.

2. The alarms acting by pressure are of the nature of the safety-valve; the noise of the escaping steam or its impingement upon a whistle causing an audible alarm. See low-water alarm; safety-valve.

1877.

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