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عرض 1876–1890 من أصل 1963 نتيجة
Ultrasonic Transmitter And Receiver Set
This apparatus consists of a self-contained transmitter and receiver operating in the 40 kHz region. The transmitted wave is modulated at a user controlled variable frequency of about 2 kHz and this is detected by the receiver which amplifies the signal and drives a miniature integral loudspeaker. Both transmitter and receiver are contained in separate plastic enclosures measuring 175 x 100 x 40 mm which contain all the electronics and the 9 V batteries. The receiver has front panel 4mm sockets so that the output can be monitored on an oscilloscope for more quantitative measurements. The system is ideal for demonstrating sound waves above the hearing threshold and reflection properties associated with sonar etc. A special feature is the second transducer on the transmitter which can be switched on when required to produce two coherent sources. By moving the receiver along a line parallel to the two sources interference patterns can be dramatically demonstrated simplifying the Young’s slits experiment or enabling it to be demonstrated using waves other than light. Complete with batteries, full instructions and suggestions for use.
SKU: PH94022Universal Oven
For heating up to 250 °C. Inside chamber made of thick aluminium or stainless steel sheet. Outside made of mild steel, the gap between the walls being filled with glass wool. Heating elements are placed in ribs at the bottom and sides of chamber for uniform heating. Thermostatic control is provided which gives a temperature fluctuation of not more than ±1 °C read by an L-shape thermometer. The insulated door closes firmly against heat resistant gasket and is provided with a handle with spring latch. Front panel has ON / OFF switch, 2 neon indicators and dial for temperature setting. Unit provided with 1.5 m of 3-core cable. Works on 220-240 V AC.
SKU: CH11812Vacuum Pump, Rotary, Oil-Sealed
General purpose, single stage with low level of vapour emission. Can be used as a pressure device also. Direct drive, compact construction, displacement 32 liters/minute, ultimate vacuum without gas ballast 0.1 mm of mercury, motor rating 0.25 HP, rpm 1425, supplied with 1 meter 3-core mains cable and 1.5 litre oil. For use on 220-240 V, 50 Hz.
SKU: CH11871Van De Graff Generator
A small but powerful Van De Graaff generator. Generates high potential and sparks up to 8″. With aluminium dome diameter Approx. 6″, Total height about 18″ with a ground terminal for discharge electrode. Comes with one replacement belt and experiment book. Supplied with discharge electrode.
SKU: PH45095Van De Graff Generator, Hand Driven
For production of high voltage static electricity, self exciting with insulating Perspex stand, rubber belt, removable metal dome, mounted on wood base, with a driving wheel and driving belt. The discharge sphere is mounted on a pivoted arm with handle for adjustment and is attached to driving wheel support. With a 4 mm socket at top of the dome and a 4 mm earth socket in the hand wheel support. Supplied with discharging sphere, but without accessories.
SKU: PH45080
