‘Tis the Season...

Let the Giving Begin! Durac® Weather Ball The SpillNot™ Solar Powered Car

The design of the SpillNot™ uses the principles Economical and attractive demonstration car model. Can be enable you to predict weather conditions. of Newtonian physics to keep the liquid in the powered by a solar cell or a rechargeable battery. Slide switch Rising water in the tube means bad weather; falling container. The flexible handle and the location of the turns on/off and selects function. All working parts water in the tube means good weather. suspension point above the center of the tray ensure visible through clear molded housing. Glass construction that the forces on the liquid are always directed Dimensions: 6 in (152 mm) towards the supporting tray, even when the tray is Accuracy: 3.5mbar; 0.1inHg; 0.3cm Hg in motion.

Thomas No. Description Price Thomas No. Description Price Thomas No. Description Price 1212Q62 Durac® Weather Ball Barometer $73.36 1216B74 The SpillNot $15.95 1216B73 Solar Powered Car $22.95

Crystal Models Economy Magnet Kit Energy Conversion Kit Ball-and-spoke structural models of graphite, sodium An exceptional value! This economical seven piece kit lets you chloride and diamond. All models are permanently KIT INCLUDES THE demonstrate the conversion between mounted on acrylic bases: Graphite (Clear hexagonal FOLLOWING: different forms of energy. It includes four base); Sodium Chloride (Clear square base); Diamond 1 Steel horseshoe magnet, devices for generating electrical (Clear triangular base). energy from mechanical motion, 3 Ceramic donut magnets, 1 Iron filings pack, chemical energy, light, and wind and three devices for using electrical Each model contains 22mm diameter balls: Graphite (39); 1 Lodestone, 1 Activity Guide containing 17 experiments, 2 Ceramic energy to generate light, motion, and sound. A set of cables is included Sodium Chloride (27); Diamond (30). bar magnets, 4 Metal squares (iron, copper, aluminum, and zinc), and for connecting the devices to each other in various combinations. The Thomas No. Description Price 2 magnetic compasses. kit includes a manual. Activity guide included. 1216X45 Graphite Crystal Model $35.95 1216X46 Sodium Chloride Crystal Model $34.95 Thomas No. Description Price Thomas No. Description Price 1216X47 Diamond Crystal Model $35.95 1216L64 Economy Magnet Kit $28.86 1216E17 Energy Conversion Kit $59.95

DNA Model Stirling Engine Newtonian Demonstrator This pre-assembled DNA model is built to a scale of This attractive and economical Stirling Engine is both Excellent for illustrating Newton’s Third Law 10 cm to 1 nm and accurately depicts a 16 base pair engaging and a great educational tool. It runs by of Motion and the principle of Conservation of section of DNA. The phosphate-deoxyribose backbone exploiting the heat flow generated by the small Momentum. The five polished metal balls with and the four bases are represented by custom plastic temperature differences between room temperature thin bifilar suspensions on a unique support moldings that show the shapes of the molecules in and a container of hot water or ice. Activity guide design provide for better results and stability. scale and illustrate the bonding between them. included. Activity guide included. DNA Model Kit is also available. Shipping weight: 1.15 Lbs., Dimensions: 5.5” x 6” x 7”. Thomas No. Description Price 1216W92 DNA Model $51.95 Thomas No. Description Price Thomas No. Description Price 1216W93 DNA Model Kit with 4 models and CD $159.95 1216B71 Low T Differential Stirling Engine $99.95 1216R63 Newtonian Demonstrator $15.99

Radiometer Atomic Models Set An updated version of our popular atomic Our Radiometer is made from a glass bulb from • Colorful model sets that are suitable for constructing which much of the air has been removed. Inside • Available in °C or °F complex organic and inorganic molecules. Sets the bulb, on a low-friction spindle, is a rotor with 4 • Ideal for classroom use can be used to model different organic and vanes. Each vane has one blackened side and one Unit consists of a sealed glass cylinder containing multi- inorganic compounds. silvered side; one black vane features a white dot colored floating spheres. The spheres have different weights, in order to count rotations easily. When exposed to which rise and fall at different temperatures. Current Thomas No. Description Price temperature is indicated by the tag attached to the lowest of sunlight or artificial light, the vanes turn with no 1216X40 Atomic Models Set, Classroom $89.95 apparent motive power. the floating spheres. Can be used to accurately measure indoor 1216X41 Atomic Models Set, Student $19.95 ambient temperature anywhere. Thomas No. Description Price 1216X42 Molecular Model Set, Teacher $54.95 1216T58 Radiometer $8.95 1216X43 Molecular Model Set, Student $34.95 Thomas No. Description Price 9327J34 Galileo 11” 64/80°F $14.00 9327J38 Galileo Thermometer 13” 64/80°F $20.00 Human Skeleton Model, Brain Models 9327J42 Galileo Thermometer 17” 68/80°F $29.00 Life-Size 9327J46 Galileo Thermometer 24” 62/82°F $42.00 Excellent life-size human brain models for This life size human skeleton model features unbreakable students. The Brain Model is dissectable into Learning Can Be Fun! plastic bones which were carefully cast to preserve the 3 parts, while the Deluxe Brain Model is Let Thomas Scientific Help You finest details. The mandible is hinged; the arms, legs dissectable into 8 parts. and skull are removable; and the calvarium is sectioned Pick the Perfect Gift. to allow for study of the cranial vault. There is natural Both models come with a sturdy base and a movement in the joints wherever possible. detailed key. visit: www.thomassci.com for more great gifts today!

Thomas No. Description Price Thomas No. Description Price 1216X00 Human Skeleton Model, Life Sized $249.95 1216X05 Brain Model $42.95 1216X01 Human Skeleton Model, 85cm Tall (Half-Size) $52.95 1216X06 Deluxe Brain Model $44.95