[DOC] [TLE] Underwater diving - Wikipedia [PAR] Underwater diving is the practice of descending below the water's surface to 
conduct ... "Hard hat" diving is any form of diving with a helmet, including the 
standard .... Surface-supplied divers almost always wear diving helmets or full 
face diving ... an industrial low-pressure air compressor on the boat through 
plastic tubes. [DOC] [TLE] History of underwater diving - Wikipedia [PAR] The history of underwater diving starts with freediving as a widespread means of 
hunting and ... Limitations in mobility of the surface supplied systems encouraged 
the development ..... it free of the tube to the surface pump by using Michelin 
cylinders as the air supply, ..... Leavitt's suit was of his own design and 
construction. [DOC] [TLE] 1  History of Diving - GlobalSecurity.org [PAR] disposal, construction, ship maintenance, search, rescue and salvage operations 
... nearly impossible to breathe through a tube using only the body's natural 
respira- ... Wearing this gear, ... viewing ports, and hose connections for 
delivering surface-supplied air. The ... eral types of diving dress were being used 
in actual. [DOC] [TLE] OSHA Technical Manual (OTM) | Section VIII: Chapter 2: Respiratory ... [PAR] An estimated 5.0 million workers wear respirators, either occasionally or routinely
. ... The concept of using respiratory protective devices to reduce or eliminate ... 
Respirators are of two general "fit" types, tight-fitting and loose-fitting. ... The best 
known loose-fitting respirator is the supplied air hood used by the abrasive 
blaster... [DOC] [TLE] Final Exam with Answers - How Things Work [PAR] Dec 9, 1996 ... This air resistance explains why you have to keep pedaling to maintain .... 
Independent, gaseous water molecules can leave the surface of hot water at ... 
molecules in order to form visible numbers on the face of a watch. ... As the 
firework moves upward through the tube, the trapped gas expands behind it. [DOC] [TLE] Chronology - History of CMAS [PAR] Early Greek divers provided the known world with the majority of its sponges. ... 
Herodotus describes the ancient Greeks using freedivers performing ... etching in 
a book on Spanish artillery depicts a diver wearing a hooded mask with an air 
tube. ... an underwater oak cylinder that was surface-supplied with compressed 
air. [DOC] [TLE] Scuba Diving - MarineBio.org [PAR] Scuba Diving and Marine Biology @ MarineBio.org. ... This earliest form of diving 
is still practiced for both sport and commercial purposes (e.g., ama ... As with 
divers using surface-supplied compressed air, scuba divers are at risk for .... 
Bridge, about workers who suffered the bends after leaving the pressurized 
caisson. [DOC] [TLE] Chapter 36 - Barometric Pressure, Increased [PAR] In other words, a worker breathing air at a pressure of 2 atmospheres ... On the 
earth's surface, human beings can safely continuously breathe 100% oxygen for 
.... Various types of breathing apparatus, however, can impair its elimination or ... 
Air diving has been done to depths of slightly over 90 m, but at these extreme... [DOC] [TLE] 04 Williams5 - CEACCP [PAR] compressed breathing gas supplied from the sur- face, e.g. a diving bell or 
hookah (surface air); and. (iv) diving with compressed breathing gas via. SCUBA
... [DOC] [TLE] Underwater diving - WOW.com [PAR] Jul 28, 2016 ... Hard hat diving is any form of diving with a helmet, including the ..... free of the 
tube to the surface pump by using Michelin cylinders as the air supply ... in 1880 
by the lead diver on the Severn Tunnel construction project, .... Surface-supplied 
divers almost always wear diving helmets or full face diving masks. [DOC] [TLE] History of diving. | Thijs J Maarleveld - Academia.edu [PAR] Risks are considerable, but fatigue and wear are also part of the equation. ... It 
has incorporated any type of diving technology that has been developed since. ... 
early application of a tube through which a more or less constant flow of air is 
pumped .... Self-contained or surface supplied All techniques discussed above 
are in... [DOC] [TLE] XML - US Government Publishing

Question: Construction worker wear, or a type of diving in which the air is supplied via a tube from the surface
Answer: Hard hat