Modern Machine-Shop Practice - novelonlinefull.com
You’re read light novel Modern Machine-Shop Practice Part 274 online at NovelOnlineFull.com. Please use the follow button to get notification about the latest chapter next time when you visit NovelOnlineFull.com. Use F11 button to read novel in full-screen(PC only). Drop by anytime you want to read free – fast – latest novel. It’s great if you could leave a comment, share your opinion about the new chapters, new novel with others on the internet. We’ll do our best to bring you the finest, latest novel everyday. Enjoy
=Pressure pieces.=--Name all the pieces of an engine through which the steam pressure is received and transmitted. II. 446.
=Horse-power.=--What is the unit or measure of horse-power? What is the meaning of nominal horse-power? II. 446.
=Lost vacuum.=--Name all the causes from which the vacuum may become defective or lost. II. 447.
=Hot journals.=--What are the princ.i.p.al causes of the heating of engine journals? II. 447.
=Stays.=--What is a boiler stay? What is a gusset stay? What is a tube stay or a stay tube? II. 452.
=Stress per square inch.=--How much stress is usually allowed per sectional square inch of boiler stay? II. 452.
=Breaking of tubes.=--What is the commonest cause of boiler tubes breaking? II. 452.
=Split tube.=--How is a split tube stopped up? II. 452.
=Uptake.=--What is the uptake of a marine boiler? What is a wet uptake?
II. 453.
=Superheater.=--What is the superheater of a marine boiler? II. 453.
=Fittings.=--What fittings are essential to a marine boiler? II. 453.
=Safety valves.=--What is a dead-weight safety valve? What is a spring-loaded safety valve? What is a lock-up safety valve? II. 453.
=Test c.o.c.ks.=--What do the three boiler test c.o.c.ks show? How are boiler test c.o.c.ks cleaned? II. 453.
=Steam gauges.=--What is a gauge gla.s.s or water-gauge gla.s.s? What is a Bourdon dial gauge? What pressure is shown by a boiler steam gauge? II.
453.
=Sc.u.m c.o.c.ks.=--How many sc.u.m c.o.c.ks are used in a marine boiler? II. 454.
=Sluice valves.=--What are sluice valves in steamships? II. 454.
=Removing scale.=--How is scale removed in boilers? II. 454.
=Salinometer.=--What is a salinometer? II. 455.
=Salt in sea water.=--About how much salt does sea water contain? II.
454.
=Division plates.=--What are division plates in boilers? II. 455.
=Intercepter.=--What is the separator or intercepter of a marine boiler?
II. 455.
=Boiler draft.=--What causes the draft in a boiler? II. 455.
=Rapid wasting.=--Where does the most rapid wasting occur in marine boilers? II. 455.
=Coal consumption.=--About how much coal is consumed per square foot of grate in marine boilers? II. 455.
=Short of coal at sea.=--If at sea and short of coal, what course would you pursue in order to save coal and get into port? II. 455.
=Boiler relief in extreme danger.=--How would you relieve a marine boiler in case of the safety valve being locked down from some accidental cause, the engine also being disabled? II. 455.
=Pressure test.=--At what pressure should a new boiler be tested? II.
456.
=Boiler examination.=--State what you would consider a proper examination, inside and out, of a marine boiler that had been in sufficient service to require examining. II. 458.
APPENDIX--PART II.
DICTIONARY OF WORKSHOP TERMS.
A
=Addendum.= That part of a gear wheel tooth that extends beyond or outwards from the pitch line.
=Addendum-circle.= The circle representing the full or greatest circ.u.mference of a gear wheel.
=Adjustable reamer.= A reamer whose teeth may be adjusted to the required diameter.
=Angle-iron.= A shape of wrought iron or steel having two f.l.a.n.g.es at a right angle; thus, [L]
=Angle-plate.= A plate having surfaces at a right angle, one to bolt to the machine work-table, the work being bolted to the other.
=Angle-tooth.= A gear wheel tooth that runs across the face of the wheel in a line that envelops part of the wheel circ.u.mference.
=Angular cutters.= Cutters, whose teeth are on a circ.u.mferential surface, that is, at an angle to the cutter axis, such angle not being that of 90 to either the side face nor to the axis of the cutter.
=Angular-velocity.= Velocity measured in degrees of angle.
=Annular.= In the form of a ring.
=Ap.r.o.n.= 1. The piece that carries the tool port or clamp on an iron planing machine. 2. The front plate of a lathe carriage.
=Arbor.= 1. A mandrel used to drive work upon. 2. A spindle or shaft of a machine.
=Arc.= A portion of a circle.
=Archimedean drill= (ar-k[)i]-m-[e.]-d[=e]'an) A drilling device in which a nut moved endwise on a stock or handle causes the drill to revolve back and forth.
=Arc of approach.= That part in the revolution of a pair of gear wheels in which the teeth in contact approach the line of centres of the two wheels.
