BALL AND RING
This unit demonstrates the expansion of metal when heated and its contraction when cooled.  When either the ball or ring is heated, the ball with not pass through the ring, but when cooled the ball passes through the ring freely. The ball and ring are mounted to an insulated wooden handle to protect your hands from the heat.

#198 Ball & Ring, Best Quality
#198-A Ball & Ring, Economy

#210  Burner, Simple Candle. 
Used as a safe alternative to alcohol burners, these simple, little, units provide a source for low heat application.  Comes complete with candle.

#211 Replacement candles for #210

CALORIMETERS
#304 Calorimeter.
Open flame style w/ceramic outer shell.  This Calorimeter is used to measure the potential heat capabilities of various solid or liquid fuels. The unit is an open flame type with an insulated ceramic outer shell.  An inner walled chimney directs the heat upward around a test tube of water from which readings are taken.

#304-1 Calorimeter-- Double Wall. 
Consists of an inner vessel (100ml) and an outer vessel (300ml) with a molded cover, rubber stopper, stirrer, and fiber washer to support and insulate the inner vessel.

#304-2 Calorimeter-- Electric. 
The cover contains a mounted heating coil of about 1.5 ohms resistance with standard binding posts for electrical connections.  When connected to a 6-volt battery, this coil will cause a temperature rise of about 5 degrees centigrade in 10 minutes.  The supporting posts and coil are coated to prevent electrolysis.  Provided with an insulated handle, stirrer, and a single-hole rubber stopper.

#312  Conductometer, Heat, 5 Rods. 
Five different metal spokes, aluminum, steel, brass, copper and nickel, extend from a center hub, connected to a wooden handle.  The hub is heated and the students watch as wax falls from each spoke in the order of conductivity.  Includes wax and instructions.

#312-1A  Conductometer Pan, 5- Rod. 
Five different metal rods are inserted through stoppers in the side of an aluminum pan.  Wax is placed in dimples in the ends of each rod.  Hot water is poured in the pan and the unit is observed, demonstrating the order of conductivity.  Includes wax and instructions.

#800  Hero's Engine.
The flask is partially filled with water and is suspended over a burner.  Rapid rotation takes place when the water boils.  Steam escaping from the pipes also illustrates the action-reactions principle.  Consists of chains with a swivel, a 250ml flask and a stopper.  Instructions provided.

#802  Hot Water Heater Demonstration.
The apparatus is designed to demonstrate the operation of a low pressure steam heating system.  The flask in the demonstration apparatus corresponds to the boiler in a heating system, the tubes correspond to the steam and return lines, and the collection chamber corresponds to the radiator.  If colored water is used in the flask, it  can readily be seen that the water in the collection chamber is condensed steam by the fact that it has no color. Instructions provided.

#802-1 Hot Water Heater, glass parts only
All stoppers, tubing, and glass parts for the Water Heater except the 500ml flask.

#1202-30 Linear Expansion  Apparatus, Roller Type.
Determine coefficient of linear expansion of metals.  Consists of a cast iron base with rollers.  A metal tube is placed on rollers and the cast-metal end support, while steam is passed through the tube.  As the tube expands, a dial indicates rotation in degrees.  Linear value is computed by determining the length of expansion.  Instructions are provided.
#1202-31 Replacement Rod - Aluminum 47" Length
#1202-32 Replacement Rod - Brass 47" Length
#1202-33 Replacement Rod - Copper 47" Length
#1202-34 Replacement Rod - Steel 47" Length

#1205 Linear Expansion Apparatus, Micrometer Screw Form.
Used to determine the coefficient of expansion of different metals.  The rod to be tested is placed inside a tube that has both an inlet and outlet for steam.  A thermometer monitors temperature change.  A bell or galvanometer, is used to gauge the exact point of contact of the micrometer, for precise measurement.  Provided with 3 Rods--Iron, Copper and Brass.  Instructions included.

#1206 Linear Expansion Apparatus
This Linear Expansion testing device makes studying the expansion of metals simple and instantly visible to the student.  A metal rod is inserted into the steam chamber and steam is applied.  Expansion of the rod is immediately registered by the dial indicator that is mounted on one end.  The heat jacket has three inlet tubes for water intake, outlet and thermometer insertion.   Unit includes four metal rods 6mm x 60cm of aluminum, steel, copper, and brass.  A steam source is not provided.  The unit measures 8 cm x 10 cm x 70cm.  Instructions include.

#1873 Steam Generator.
A useful accessory for many experiments involving thermal energy. Constructed of a heavy gauge aluminum.  Consists of a boiler, sample cup, tripod and two rubber stoppers with and  without hole.  The boiler is 100mm diameter x 170mm height, the stand measures 240mm in height.

#1899 Stirling Engine

#1896 Simplified Stirling Engine.
The heat from a small candle sends this Stirling Engine model into oscillation almost immediately.  Easy to construct, this unit very visibly demonstrates the stirling engine principle.  A test tube acts as the cylinder and four marbles work as a transfer piston.  Instructions included.

#2007 Thermostat Model.
The thermostat unit demonstrates the control of temperature or electric currents by deferential expansion of metals.  The bimetallic strip mounted on a cast iron base can be used to open or close an electric circuit with varying changes in temperature.  Instructions provided.

#2100 Tyndall's Heating Apparatus.
The unit consists of four metal balls; steel, aluminum, copper and brass.  The balls are heated and dropped onto a suspended wax sheet.  By watching the balls melt through the wax at different rates, a good idea of the heat capacity of various metals can be obtained.  Instructions provided.