Mechanical Definitions |
Harpoon Log : It is a cylindrical log with a device for
registering distance. It consists essentially of a rotator and
distance registering device combined a single unit and towed
through the water. It has been largely replaced by the taffrail
log. The two types of logs are similar except that the taffrail
and only the rotator is in the water. |
Hartford Loop : It is an arrangement of piping between
a steam boiler's header and its gravity return piping. In other
words, it is a condensate return arrangement for low-pressure,
steam-heating systems featuring a steady water line in the boiler.
|
Hayward Grab Bucket : It is a clamshell type of grab
bucket which is used to handle coal, sand, gravel and other
flowable materials. |
Hayward Orange-Peel : It is a grab bucket which operates like clamshell but it has four blades pivoted to close.
|
Head Meter : It is a flowmeter which depends upon change
of pressure head to operate. |
Head Motion : It is a vibrator on a reciprocating table
concentrator that imparts motion to the deck. |
Head Pulley : It is a pulley which is placed on the discharge
end of a conveyor belt. It may be an idler or driver pulley.
|
Head Section : It is a part of a conveyor belt that consists
of a drive pulley, a head pulley, belt idlers if included and
the necessary framing. In head section a head pulley may or
may not be a drive pulley. |
Head Shaft : It is a shaft that is driven by a chain
conveyor. It serves as the mount for a sprocket which drives
the drag chain. |
Head Stock : It is a device on a lathe which carries
the revolving spindle. It is a removable head of certain measuring
machines. |
Head Up : It is used to tighten bolts on a hatch cover.
It also can be used to access hole plate to prevent leakage
from or into an operating vessel. |
Page
1
2
3
4
5 |
