What is it? Answers CXXI

Thursday, June 15, 2006

690. Watchmaker's hand puller

691. Foggles, used in instrument flight rules (IFR) training, so a pilot in training cannot see the horizon, only the instruments.

692. Soda-acid fire extinguisher

From the link above:
"The late 19th century saw the invention of the Soda-Acid extinguisher where a cylinder contained 1 or 2 gallons of water that had sodium bicarbonate mixed in it. Suspended in the cylinder was a vial containing concentrated sulfuric acid. The vial of acid was broken by one of two means depending on the type of extinguisher. One means involved the use of a plunger that broke the acid vial, while the second involved the release of a lead bung that held the vial closed. Once the acid was mixed with the bicarbonate solution, carbon dioxide gas would be expelled and this would in turn pressurize the water. The pressurized water was forced from the canister through a nozzle or short length of hose."

693. The bottom handle for a two man pit saw, it was attached to the saw with a wooden wedge:

694. Rim clamp, as described in the "Dictionary of American Hand Tools":
A wheelwrights' tool used to hold a felloe or rim in place on a spoke while working the adjacent spoke into position. It can also be used to press the felloe onto the spoke tenon. The loop encircles the hub of the wheel and the handscrew is tightened to bear on the felloe.

A much wider photo of the barn interior where this was shot can be seen here.

695. Gerotor pump

Last week's set is seen below, click here to view the full post: