Ashwani Brothers

Ambala Cantt, Ambala, Haryana

Linear Expansion Apparatus Horizontal Pattern : 

(Horizontal type) fitted with spherometer. Complete with 3different metal rods, 50cm.

(A)Long iron pipe

(B) Brass pipe.

Linear Expansion Apparatus  Vertical Pattern :

It consists of nickel plated steam jacket (brass pipe of 50cm long & 2.5cm in dia). Containing 1 out of 3 test rods, the heavy support assembly so that steam jacket is mounted vertically, fitted with superior quality spherometer. The brass pipe having welded inlet & outlet tube for steam for opening of thermometer. Complete with 3 test rods but without thermometer.

Wooden - This item is similar to the wall type but is intended for use in laboratories where wall space is limited. A thick plywood piece of thickness 12 mm having substantial wooden stand with 2 set of z-pulley and 3set of (50*5gm) slotted weights.   

Metal - This item is similar to the wall type but is intended for use in laboratories where wall space is limited. A thick plywood piece of thickness 12 mm having substantial metal stand with 2 set of z-pulley and 3set of (50*5gm) slotted weights.   

Searle’s Rigidity Apparatus :- One can find the modulus of rigidity and Young’s modulus for the material of wires by Searle’s method. The 30cm long wire under test is connected to two brass rods about 30cm long at their mid points by two screws fitted at the ends of the wire. The rods are suspended from hooks. Complete with three test wires with connecting screws.

Application/Usage :- To determine Young’s modulus, modulus of rigidity and Poisson’s ratio of the material of a given wire by Searle’s dynamical method.

Stand for Searle’s Rigidity Apparatus : - Stand for the Searle's Rigidity apparatus.

Rigidity Apparatus Dynamical method :- It consists of an iron rod having length 16” and diameter 1”. The circular rod is graduated 15-0-15cm. The circular weight with thumb screw which fits into the rod is also provided.

Consisting of an aluminium disc 25cm diameter. Another small disc of iron C.P. having same diameter, as the interior of a grooved area of the bigger disc (the small disc has approx. 10.5cm dia and 1.25cmthickness). A tall U-shape metal bridge with a split chuck fitted into disc enable accurate suspension and torsion. Supplied with wall bracket.

Experiment is aimed at finding these unknown forces using simple dial gauges. A Bifilar Suspension by two wires/rope of different materials is an indeterminate system. It will have one unknown force in each wire/rope and a vertical unknown reaction at the hinged support.  In this case there are only two effective equations of equilibrium. Apparatus is Supplied with wires/ropes of equal length and diameter, 2 Dial gauges and a weight hanger.

Searle’s Young Modulus Apparatus :- Comprising of two brass frames with specially designed self centering chucks, connected by a pivoted link carrying a sensitive spirit level and a standard micrometer head reading to 1/100 mm. Supplied with a celling bracket, constant weight and suitable wire. Without weights.

Application/Usage :- To determine Young’s modulus, modulus of rigidity and Poisson’s ratio of the material of a given wire by Searle’s dynamical method.

Young Modulus Apparatus Vernier Type :- Simple but very efficient consisting of 10 cm brass scale and vernier to read 0.1 mm with slide. Complete with wire Ceiling attachment and constant cast iron weight.

Consisting of a rubber tube of about one meter length with a small pointer on a heavy cast iron stand.

Application/Usage :-To find out the Poissons ratio of rubber by experiment.

The apparatus has been designed to explain the basic principle of production of heat by rotating of vanes friction. It consists fixed vanes encased in a wooden case lined with felt.The box can slide freely on a wooden base and is fitted with thermometer clamping device.A rotating cast aluminium cylinder rotates freely on a cast metallic pedestal and to its axle rotating vanes is provided which converts the kinetic energy into heat energy and temperature of water in copper vessel rises after two to three minutes of rotation.Two pulleys are fitted on iron frame. Complete as described with cord.But without thermometer.The above apparatus is also provided with non-resetable zero revolution and shown in the diagram & with two set slotted weight and cord.

(University Pattern) Comprising two units each having a double walled jointless copper vessels with non-conduction cover through which is suspended a 7.5 x 5cm size copper calorimeter.A second covering protects the top of the calorimeter from dust and heat losses.The annular spaces between the double walled vessels are connected by T Tubes, which enable water at same temperature to be kept circulating through them, superior quality.

Application/Usage :- To verify Newton's Law of Cooling

"To determine the value of G. It consists of an electronic unit having for sockets & a switch to help to hold or release the ball.A heavy retort stand carries a solenoid. When toggle switch is on catch position, current flows through solenoid producing a magnetic field & holding the ball.The retort stand carries another base.The ball after being released from solenoid falls on this base.Time taken by the ball to travel from solenoid to second base is recorded in electronic unit."

Lever Apparatus: It consists of half-meter aluminium strip with stone agate knife edge at the center. The aluminium strip is firstly painted and after that it is screen printed as 25-0-25 cm having zero at the center. Two plastic hooks, which moves along the aluminium meter scale is also provided. These plastic hooks are used for carrying slotted weights. This set up is provided on a superior quality, duco painted, and sheet metal stand but without weights.

One meter long, made of soft wood and well polished brass fitting with meter scale graduated both sides in centimeters. It is provided with wire of three different materials, sliding wedges and hook etc. but without weights.

Jaeger's Surface tension Apparatus

Having a wide mouth reagent bottle fitted with a cork having two holes, in one hole a dropping funnel is fitted. Complete with manometer, capillary tube. All mounted on suitable wooden stand. Without aspirator.   

A superior and sturdy apparatus. A Borosil glass tube of about 30 cm dia and one meter long is made to stand vertically firmly in between two upright bars with the help of clamps on a heavy cast iron base. Both sides of the tube are open. On the lower end a rubber cork without holes is fitted whereas on upper end a rubber cork with a funnel is provided. With two rubber band index mark and 6 steel balls of different diameter. Without lead shot.

The beam is fixed at one end such that the rotation of 150 intervals can be given and clamped such that the principal axis of its cross-section may be inclined at any angle with the horizontal and vertical planes. Also arrangement is provided to apply vertical load at the free end of the cantilever and to measure horizontal and vertical deflection of the free end. A dial gauge is supplied with the apparatus.

For determining the relative conductivity of thin layers of materials, it consists of cylindrical brass slab of 11cm dia and 10.5mm thick. On this rest a 4.5cm deep brass hollow cylinder (Steam Chest) of this same dia with inlet and outlet tubes for steam. A hole for thermometer is drilled radially in each, and the cylindrical brass slab is fitted with eyelets to enable it to be suspended by three strings from stout annular ring. The ring is held on a heavy Retort Stand complete as above with accessories but without thermometer.

Application/Usage :- Determination of thermal conductivity of a bad conductor in the form of disc by lee’s and charlton’s method

Comprises two metal trays. 130 x 55 x 23 mm joined together by a pair of spring steel strips 10mm wide, the distance between the trays being 215 mm. One tray is drilled to hold three equal cylindrical masses. The other tray acts as an anchorage and may be clamped to the bench either horizontally or vertically. Complete with three masses and a ‘G’ clamp for mounting. Dimensions 325 x 130 x 23 mm overall.

All metal, the upright has a concave top. A metal ball and aluminium sheet piece is placed on it. A sudden blow with spring actuated striker causes the sheet to slide from under the ball which has no time to gain horizontal momentum, but drops into the concave top of the stand. It is used to explain first law of motion.

Consisting of Borosilicate glass tube open at both ends. The heating element is a coil about 40cm long of nichrome wire and is wound spirally inside along the axis of the glass tube. The element is easily detachable and is encased in a wooden case lined with felt and provided with a hinged cover. The leads are carried to terminals. Complete with contact level tank of brass fitted on stand. The apparatus when fitted is leak proof. The two metal pots are of thick brass sheet. Without thermometers or meters.

Application & Usage :- To determine the mechanical equivalent of heat by Calendar and Barnes's Method

The apparatus consists of a spiral spring about 25mm in diameter and 10cm long. The upper end of he spring is suspended from chucknut and lower and is provided with small pointer which moves over a vertical wooden meter scale. The lower end is also provided with hook for carrying  weights.     All this setup is    provided on a heavy    metal     base   and with weights. (A) Small (B) Big

Consisting of mirror scale, spring, slotted weights with hanger and pointer, complete on heavy tripod stand. (A) 30cm long miror scale (b) 12cm