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A Bunsen burner placed atop a heatproof mat A heatproof mat An asbestos heatproof mat over a Teclu burner. A heatproof mat, also known as wire gauze or a gauze mat, is a piece of apparatus commonly used in tabletop lab experiments that involve moderate temperatures (for example, when a Bunsen burner is being used) to prevent damage to a work surface. [1]
Heat traps are valves or loops of pipe on the cold water inlet and hot water outlet of water heaters. The heat traps allow cold water to flow into the water heater tank, but prevent unwanted natural convection and heated water to flow out of the tank. [1] [2] Newer water heaters have built-in heat traps.
A cigarette holder is a fashion accessory, a slender tube in which a cigarette is held for smoking. Most frequently made of silver , jade or bakelite (popular in the past but now wholly replaced by modern plastics), cigarette holders were considered an essential part of ladies' fashion from the early 1910s through early to the mid 1970s.
A pipe tool is a small gadget designed to aid in packing, smoking, and emptying a tobacco pipe. There are three principal pipe tools: the tamper, the reamer, and the pick: [ 1 ] The tamper is a blunt instrument, either a simple dowel or shaped like the head of a nail.
PTFE tape used for different sized fittings PTFE tape for natural gas. There are two US standards for determining the quality of any thread seal tape. MIL-T-27730A (an obsolete military specification still commonly used in industry in the US) requires a minimum thickness of 3.5 mils and a minimum PTFE purity of 99%. [3]
The application of thermal pipe insulation introduces thermal resistance and reduces the heat flow. Thicknesses of thermal pipe insulation used for saving energy vary, but as a general rule, pipes operating at more-extreme temperatures exhibit a greater heat flow and larger thicknesses are applied due to the greater potential savings. [3]
In plumbing, a trap is a U-shaped portion of pipe designed to trap liquid or gas to prevent unwanted flow; most notably sewer gases from entering buildings while allowing waste materials to pass through. In oil refineries, traps are used to prevent hydrocarbons and other dangerous gases and chemical fumes from escaping through drains.
Tobacco pouches date back to traditional Japan, and appear in artwork dating back to the 17th century. [1] They were also made in Canada in the early 1900s. [2] A tobacco pouch is a vital clue in the Sherlock Holmes short story The Adventure of Black Peter. Along with boots, tobacco pouches were one of the first uses of the zip. [3]