Quick answer. Judge each rig on whether it measures the quantity the experiment is about, not on its name. A three hinged arch is only worth running if the horizontal thrust is measured rather than inferred and the load can travel along the span in known increments; a beam rig needs a stiff, bolted frame, supports that genuinely rotate and slide, and dial gauges on independent mounts. Buy the Clerk Maxwell reciprocal theorem apparatus and run it first, because a reciprocity failure exposes the friction, flex or play that corrupts every other result. And order by full product name, because this listing has code faults.
These are the records to ask for by name: an apparatus for verification of Clerk Maxwell's reciprocal theorem; a behaviour of columns and struts apparatus; a curved member apparatus; an elastically coupled beam apparatus; an elastic properties of a deflected beam apparatus; a three hinged arch apparatus; and, further into the listing, a suspension bridge, trusses, a bifilar and trifilar suspension apparatus and a statics and vibrations set. Together they cover what a structural mechanics course examines: deflection and strain energy in beams and curved members, the thrust and influence lines of an arch, the stability of columns, and the dynamics of simple suspended systems.
And the honest part, which we would rather you heard from us. This listing also holds a substantial number of records that are not structural mechanics at all. They were copied in when the catalogue was imported, and most carry a digit on the end of the name. Among them, on the first page alone, are a mechanical heat pump trainer, a refrigeration trainer, an air conditioning trainer and an ice plant trainer - all of which belong with refrigeration and air conditioning. Deeper in there are a roll crusher, a trommel and a vibrating screen, which belong with mechanical operations; steam engine models and a wind tunnel, which belong with machines; and an automatic transmission, an injection petrol engine and several mechanism rigs, which belong with theory of machines and the automotive ranges.
Three code faults in this listing, which matter if you order by code. One code appears twice against two different products - an elastically coupled beam apparatus and an elastic properties of a deflected beam apparatus share a number. One code is written without zero padding, so a code search will not find it. And there are gaps in the sequence. Quote the full product name, not the code, and ask us to confirm the item and its specification on the proforma invoice. We are correcting the data.
Here is an idea worth building a structures laboratory around, and the apparatus for it is the first item in this listing.
Clerk Maxwell's reciprocal theorem says something that sounds too neat to be true: the deflection at point A caused by a load at point B is exactly equal to the deflection at B caused by the same load at A. It is a consequence of linear elastic behaviour, and it holds for any elastic structure.
Which makes it the most useful check a structures laboratory has. If reciprocity does not hold on your apparatus, the theory is not wrong - your apparatus is. Friction at a support, a bearing that does not rotate freely, a frame that is not level, a dial gauge mount that moves, play in a pin joint: every one of those breaks reciprocity, and every one of them is also quietly corrupting the beam deflection and arch thrust results on the bench next to it. So run the reciprocal theorem experiment first, on a new apparatus and after any move, and treat it as the laboratory's calibration rather than as one experiment among many.
| If reciprocity fails, look at | What it also corrupts |
|---|---|
| Friction or stiction at the supports | Every beam deflection result, in the direction of under-reading |
| A frame that is not level, or that flexes | All deflection measurements - the apparatus deflects with the specimen |
| Play in pin joints | Truss member forces and arch thrust, unpredictably |
| A dial gauge mounted on the loaded member or on a flexing bracket | Everything that gauge reads |
The three hinged arch is statically determinate, which is exactly why it is taught: the horizontal thrust can be found from statics alone and then checked against measurement. The experiment is only worth running if the horizontal thrust is actually measured rather than inferred - so ask how the thrust is read, what its range and resolution are, and whether the support that takes it is genuinely free to move in the direction it must.
Ask also whether the load can be moved along the span in known increments, because the real lesson is the influence line - how the thrust varies with load position - and that needs a series of positions rather than one. A rig with a fixed load point demonstrates a number; a rig with a travelling load teaches a method.
These three rigs teach strain energy and the methods built on it, and they share the same practical requirements as beam work everywhere: a stiff frame that is bolted down, supports that rotate and slide as the idealisation assumes, dial gauges on independent mounts, and beams whose dimensions have been measured rather than taken as nominal, because the second moment of area is calculated from them and a nominal section carries an error straight into the answer.
For the curved member apparatus, ask the radius and section and whether both in-plane and out-of-plane loading can be applied; for the coupled beam, ask how the coupling stiffness is set and whether it can be varied, since the interesting result is what happens as the coupling changes. The columns and struts apparatus is the stability experiment, and it carries the warning that belongs with every buckling rig: buckling is sudden, and a strut released at its critical load can leave the apparatus, so ask for a guard, an end retention arrangement and a stated maximum load. The same subject, with more apparatus, is in our strength of materials lab listing.
For each rig: the experiment and the quantities measured, with resolution against the magnitudes expected; frame stiffness, mass and bolt-down requirement; support type and whether rotation and sliding are genuinely free; thrust or reaction measurement where the experiment needs it; whether loads can be moved in known increments; specimens or members supplied, with measured dimensions and material, and the price of further sets; dial gauges and indicators, with independent mounting; guarding on buckling and anything that fails suddenly; the worksheets supplied; bench or floor mounting and footprint; consumables and spares with prices; and the warranty, commissioning and local service position. For any certification stated here, contact us for the latest copies of the relevant certificates before you tender on it.
Related ranges: strength of materials lab for beams, torsion, springs, strain gauges, fatigue and creep, machines for the demountable structures sets, trusses, arches and girders, universal testing machines for the load frames and verification certificates, and models for theory of machines for dynamics. The full set is listed under mechanical lab equipments. For a quotation, send us your syllabus experiment list - on this listing in particular it lets us quote the structural apparatus and leave out the records that should not be in this category.
Because it is the most useful check a structures laboratory has. Clerk Maxwell's reciprocal theorem says the deflection at A caused by a load at B equals the deflection at B caused by the same load at A; it follows from linear elastic behaviour and holds for any elastic structure. If it does not hold on your apparatus, the apparatus is at fault: friction at a support, a bearing that does not rotate freely, a frame that is not level, a moving dial gauge mount or play in a pin joint. Each of those also corrupts the neighbouring beam and arch results, so treat this experiment as the laboratory's calibration.
The three hinged arch is statically determinate, so the horizontal thrust can be found from statics and then checked against measurement - which is only worth doing if the thrust is actually measured rather than inferred. Ask how the thrust is read, its range and resolution, and whether the support that takes it is genuinely free to move in the direction it must. Ask also whether the load can be moved along the span in known increments, because the real lesson is the influence line. A rig with a fixed load point demonstrates a number; a rig with a travelling load teaches a method.
A stiff frame that is bolted down, supports that rotate and slide as the idealisation assumes, dial gauges on independent mounts, and beams whose dimensions have been measured rather than taken as nominal, because the second moment of area is calculated from them and a nominal section carries its error straight into the answer. For the curved member apparatus, ask the radius and section and whether both in-plane and out-of-plane loading can be applied. For the elastically coupled beam, ask how the coupling stiffness is set and whether it can be varied, since that change is the interesting result.
Only with the right protection. The columns and struts apparatus is the stability experiment, and buckling is sudden: a strut released at its critical load can leave the apparatus. Ask for a guard, an end retention arrangement and a stated maximum load before ordering, and make sure students stand clear when approaching the critical load. If your course needs more buckling and stability work than one rig provides, the same subject is covered with more apparatus in the strength of materials lab listing, so compare the two before deciding which to quote.
Because records were copied in when the catalogue was imported, and most carry a digit on the end of the name. The heat pump, refrigeration, air conditioning and ice plant trainers belong with refrigeration and air conditioning; the roll crusher, trommel and vibrating screen with mechanical operations; the steam engine models and wind tunnel with machines; and the automatic transmission, injection petrol engine and mechanism rigs with theory of machines and the automotive ranges. Send your syllabus experiment list, so the quotation covers the structural apparatus and leaves out the records that do not belong here.
Quote the full product name rather than the code. One code appears twice against two different products, the elastically coupled beam apparatus and the elastic properties of a deflected beam apparatus; one code is written without zero padding, so a code search will not find it; and there are gaps in the sequence. For each rig, ask for the experiment and quantities measured with their resolution, the frame stiffness and bolt-down requirement, the specimens supplied with measured dimensions and material, the worksheets, the footprint, spares, warranty, commissioning and local service, all confirmed in writing on the quotation.
Ray Export is a manufacturer and exporter of laboratory, scientific and educational equipment based at Plot No. 449, HSIIDC Industrial Area, Saha, Ambala, Haryana 133104, India. Enquiries: [email protected], +91-9817319615.
Written by Palak Mall, Senior Content Writer. Technically reviewed by Arvind Kumar, Lab Equipment Specialist, 12+ years in laboratory and testing instrumentation. Last updated: 17 October 2026.
Every specification, including the quantities measured, their resolution and the frame and support details, is confirmed in writing on the quotation. For certificates, contact us for the latest copies of the relevant certificates. No price is quoted here. Listing defects noticed: this listing holds many records that are not structural mechanics - heat pump, refrigeration, air conditioning and ice plant trainers, a roll crusher, trommel and vibrating screen, steam engine models, a wind tunnel, an automatic transmission, an injection petrol engine and mechanism rigs - most with a digit appended to the name; one code is shared by the elastically coupled beam and the elastic properties of a deflected beam apparatus; one code lacks zero padding; and the code sequence has gaps.
With our in fact propelled group in our ultra-present day producing office, we offer an aggressive scope of Apparatus for Verification of Clarke's Maxwell Reciprocal Theorem.
1. Mechanical assembly comprise of a gentle steel bar 100cm long and 1.25cm x 4mm in cross segment with graduations at each 10cm along the length.
2. It is hung on two blade edge bolsters which are 70cm separated with a 30cm shade on one side. Proportional hypothesis can be checked by coordinate estimations of the redirections of different focuses with a dial measure in light of the heap set at the equal focuses.
3. A dial check with 25mm travel (with an attractive base) is furnished with the mechanical assembly. It comes finish with a supporting stand and an arrangement of weights.
Conduct of Column and Struts Apparatus is accessible with us. The plan of the mechanical assembly holds four spring steel segments which are put along a vertical wooden board. These four segments have diverse conditions:
1. The two finishes stuck
2. The two closures settled
3. One end stuck and other settled
4. One end settled and opposite end free
The device comes finish with a supporting stand and set of weights.
1. Bended Member Apparatus comprises of a steel bar which is utilized to make the diverse bended individuals Viz.
• Circle
• Semicircle with straight arm
• A quadrant of a circle and
• Quadrant of a hover with straight arm
2. The base finishes of the individuals are secured to the base. At free end stack is connected , its even and vertical diversion are estimated with the assistance of dial measures
3. A dial measure with 25mm travel (with an attractive base) is given along the device
1. We mean to give quality loped Elastically Coupled Beam Apparatus which involve three parallel bar suspension framework with versatile shaft at their best and lower closes.
2. The upper closures of the two external suspension poles are secured to a vertical wooden board while focal suspension bar is joined to the focal point of another flexible pillar bolstered at the outside finishes.
3. It is produced using Mild steel Apparatus and comes finish with supporting stand and an arrangement of weights
Three Hinged Arch Apparatus is fabricated from gentle steel in order to withstand the impacts of the investigation. Every one of our items are quality tried and are work agreeing standard modern standards. Following is the working of the mechanical assembly:
1. This mellow steel made mechanical assembly has a width of 100cm and length of 25cm, with pivots at backings and best. One of the closures lays on rollers.
2. Along the flat width of the curve different focuses are set apart at equidistant for the utilization of load.
3. This being a statically determinate structure, the flat push created under the activity of any heap framework can be hypothetically figured and will likewise be estimated straightforwardly by killing the outward development of the roller end.
4. A dial measure is provided with the contraption alongside supporting stand and weights.
We bargain in refrigeration coaches produced to show the parts and general working cycle of refrigeration framework. With different estimation gave in the coach, the client can ponder the execution of the framework.
Determinations:
• Hermetically fixed compressor-limit of 0.3 T.
• Thermostatic Expansion Valve
• Capillary tube.
• Evaporator loop.
• Services Valve
• Solenoid Valve
• Filter-Drier for refrigerant
• High/Low weight cut-out
• Thermostat.
1. The unit comprises of ducting fitted with different aerating and cooling parts. Wind current is created by a pivotal stream fan. In the wind stream, radiators, cooling loop and steam humidifier association is given.
2. Cooling circuit comprises of a hermetic compressor; air cooled condenser, thermostatic development valve and evaporator (i.e. cooling loop).
3. Estimations of different parameters enable the clients to effectively comprehend and take in the essential standards of aerating and cooling.
Determinations
• Hermetic compressor: limit 2/3 ton of refrigeration (approx.)
• Pressure checks for high and low weight.
• Prescott or high and low weight cut-out).
• Thermometers for temperature estimation at different focuses In the cycle.
• Energy meter for compressor input estimation.
• Condensate estimating course of action.
• Heating Circuit
• Steam generator and injector for humidification of air
• Anemometer for estimation of air speed,
The ice plant mentor keeps running on ice can framework. In this framework, the jars are loaded with water and are submerged in tank in which salt water arrangement is circled. The brackish water is cooled by the refrigerant, which thus cools the water in can and transforms it into ice.
Details:
1. Compressor: Kirioskar make hermetically fixed compressor utilizing R 12 Refrigerant.
2. Condenser: 4 push write air cooled.
3. Development Valve : 0.5 TR limit.
4. Evaporator: 1/2" O.D. copper tube - 75 feet long.
5. Channel – Drier : Silica gel filled - 3/8" flare associations.
6. Fundamental Tank : 600 mm X 375 mm
7. Add up to Ice Cane Capacity : 7 Kg
8. Ice Making Capacity : 7 Kg/4 Hours.
9. Thermocol protection : 6.5"
10.Brine Stirrer : Motor driven fan, 1 stage, 1/10 HP, 1440.
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