The Engineers' Digest, Volume 21941 - Engineering |
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Page 19
... TOPAZ possesses properties and a chemical composition which are unique . The chemical formula is / A1 ( F , OH ) / 2SiO , or / A1 ( F , OH ) 2 / AlSiO4 . Fluorine and hydroxyl water are isomorphus and are variable in relation to each ...
... TOPAZ possesses properties and a chemical composition which are unique . The chemical formula is / A1 ( F , OH ) / 2SiO , or / A1 ( F , OH ) 2 / AlSiO4 . Fluorine and hydroxyl water are isomorphus and are variable in relation to each ...
Page 20
... topaz , only slightly altered . Another is the coarse grains of topaz almost inverted to fairly coarse needles of mullite , averaging about 0.06 to 0.01 mm . in size . The third type of material is the pre- dominating , originally fine ...
... topaz , only slightly altered . Another is the coarse grains of topaz almost inverted to fairly coarse needles of mullite , averaging about 0.06 to 0.01 mm . in size . The third type of material is the pre- dominating , originally fine ...
Page 21
Topaz heated to 2700 and 2800 F ( Fig . 5 ) , shows progressively larger mullite needles . The cloudiness of the groundmass begins to disappear at 2700 F. EFFECT OF HEAT TREATMENT UPON SPECIFIC GRAVITY OF TOPAZ SPGR 40 30 30 34 Fig . 5 .
Topaz heated to 2700 and 2800 F ( Fig . 5 ) , shows progressively larger mullite needles . The cloudiness of the groundmass begins to disappear at 2700 F. EFFECT OF HEAT TREATMENT UPON SPECIFIC GRAVITY OF TOPAZ SPGR 40 30 30 34 Fig . 5 .
Contents
ENGINEERS | 2 |
Sothern | 5 |
Fuel Saving in Central Heating Installations | 12 |
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adjusted aircraft airscrew alloys aluminium angle apparatus austenite automatically B.Sc blade boiler breaker cable carbon cast iron circuit combustion compressed cooling corrosion crank shaft curve cylinder D.Sc diameter Digest driving efficiency electric electrode electrolytic engine equation flow frequency fuel gases gear grinding heat hydrogen increase injection lag installation insulation kg/cm² lamp lever limits load lubrication M.Sc machine magnetic material maximum measured mechanism metal method milling cutter motor motor-generator nozzle obtained operation output Pelton wheel piping piston plant plate pressure pump radiation ratio rectifier resistance ring rubber scavenging selsyn sheet shown in Fig shows specimen speed steam steel stress stroke stroke volume suitable surface switch tank temperature tensile strength thickness tion transformer tube turbine valve velocity vibration voltage volts weight welding wheel Wigmore Street wind wire دو دو