- 



L CONSIDERATIONS 



tt ph0ft depending on fluid pressure we have 



1. Pump*, condensing and rarifying syringes, Orsted's Piezometer, Andrews's 



apparatus for high pressure. 



2. Pipes and tubes. 



8. Packing, washers, caoutchouc tubes, paraffin joints; fusion and other 

 methods of making joints tight. 



4. Air chambers, water reservoirs, vacuum chambers. 



5. Safety valves. 



6. Governors by Siemens and others, Cavailld-Col's regulator for organ 



blast 



7. Pressure-gauges, barometers, manometers, sphygmographs, &c. ; areometers, 



and specific gravity bottles ; current meters, gas meters. 

 a Scales for these gauges. 



For thermal phenomena 



1. Furnaces, blow-pipe flames, freezing mixtures, solar and electric heat. 



2. Hot water pipes, copper conductors. 



3. Non-conducting packing, cements, clothing, &c.; steam-jackets, and 



ice-jackets. 



4. Regenerators, heaters, <fec. 



5. Condensers and safety valves. 



6. Thermostats, (1) by regulation of gas; (2) by boiling a liquid of known 



composition. 



7. Thermometers. Pyrometers, Thermoelectric Pile, Siemens' resistance 



thermometer; Calorimeters. 



8. Standard temperatures : as those of melting ice, boiling water, &c. 



For electric phenomena 



1. Electric machines, frictional machine, electrophorus, Holtz' machine; 



voltaic batteries, thermo-electric batteries, magneto-electric machines. 



2. Wires and other metallic conductors ; armatures of magnets. 



3. Insulators. 



4. Leyden jars and other "condensers;" secondary batteries or cells of 



polarization ; magnets, and electro- magnets. 



5. Rheostats, lightning conductors, &c. 



6. Guthrie's voltastat, regulators of electric lamps, &c. 



