1064 



Section 12: Thermo-electricity. Miscellanea. 



No. 63 442 



63 445. 



63 443. 1 : 4. 



63 446. 



63 442. 1 : 6. 



63447. 



63.442. Electrothermic Apparatus after Schumann, Figure (M. P., 9 th Edn., Ill, 

 Fig. 842) 



Bismuth rods are soldered on to both sides of an antimony rod. The junctions are enclosed in 

 the bulbs of two air thermometers, so that the Joule effect is produced in both bulbs in the same 

 manner, but the Peltier effect in the opposite manner. The liquid pointer gives opposite deflections 

 when opposite currents are conducted through. 



63.443. idem, smaller, Figure, for objective projection 



The tubes with the liquid indicators are fitted in front of a transparent scale in order to render 

 the phenomenon simultaneously visible to all the audience. 



The Peltier Effect can also be shewn with the Kolbe Differential and Double Thermoscope 

 (see "Heat" Section). 



63.444. Thermocouple after Wunder (Ztschr. f. d. phys. u. chem. U., 24, 1911), Figure 

 on p. 1065. The current density produced by heating the thermocouple is sufficient 

 to allow the magnet to carry an armature 



Mathematical Instruction Models. 



63.445. Model after Meffert, for Explaining the Pythagorean Theorem, Figure 



63.446. idem, different pattern, Figure 



63,447. - - i d e m, for proving the theorem that the areas of like polygons are as the squares 

 of homlogous sides, Figure 



Mineralogy. 



100 Minerals, selected pieces, carefully chosen and arranged in compartment s : 



List Xo. 63,452 63,453 



Average Size of the Minerals, cm 5x6 7x9 



2.10.0 4.5.0 



The collection comprises: I. Elements: Graphite, Sulphur, Bismuth, Copper. II. Sulphides: Real- 

 gar, Antimonite, Native molybdenum-sulphide, Galena, Cinnabar, Zinc blende, Magnetic Pyrites, Red 

 Nickel Pyrites, Pyrite, Marcasite, Grey cobalt-ore, Arsenical Pyrites, Copper Pyrites, Fahlerz. m. Oxides: 

 Rock Crystal, Smoky Quartz, Amethyst, Quartz, Agate, Flint, Zirconium, Rutil, Tin Stone, Pyrolusite, 

 Psilomelane, Corundum, Emery, Iron-glance, Red Iron-stone Titanic Iron, Opal, Brown Iron-stone. 

 IV. Haloid Salts: Rock Salt, Fluorspar, Cryolite. Carnallite. V. Ahuninates, Ferrites, Borates: Spinel, 

 Magnetic Iron Ore, Boracite. VI. Nitrates, Carbonates: Sodium Nitrate, ('ale-spar (crystallised), Calc- 

 spar (cleavage piece), Dolomite Spar, Magnesite, Zinc-spar, Iron-spar. Aragonite, Strontianite, Cerussite, 

 Amalachite. VH. Sulphates, Tugstates: Anhydrite, Heavy Spar. Cnele-iin. Lead Snlphte. <;ypsum, Ala- 

 baster, Alunite, Seheelite, Wolframite. Vlll. Phosphates: Apatite, Phosphorite, Pyromorphite. IX. Sili- 

 cates: Cyanite, Topaz, Staurolite, Tourmaline, Kpidote, Vesuvian. Garnet, Olivin. Bronzite, Augite, 

 Actinolite, Hornblende. Nepheline. Xosean, Leucite, Orthoclase, Sanidin, Microglin. Albite, Oligoclase, 

 Labradorite, Natrolite, Desmine, Chabasite, Biotite, Muscovite, chlorite. Serpentine, Talc, Kaolinite. 

 X. Organic Compounds: Ozokerite. Asphalt, Anthracite, Coal. 



This collection mav l>e subject to slight variation acconlini; to our stock of good pieces. 



d. 



s. d. 



2. 0.0 



1.12.0 



1. 0.0 



0. 18. 

 0.15.0 



0. 8.0 



6154, 

 408, 5152, 

 3109, 5153. 



