. Beck microscopes. Microscopes. School Micro The school micro projector is a simple and self-contained apparatus suitable for use in schools and teaching establishments, and capable of showing pictures up to 4 ft. 6 in. There is a minimum amount of adjustment required for its use, as once the apparatus has been set up and connected to the supply, all that has to be done is the necessary focussing of the specimen upon the screen. The instrument is soundly constructed throughout. The base is heavy and rigid with handle for lifting. On to it is fitted the main tube of the projector w
. Beck microscopes. Microscopes. School Micro The school micro projector is a simple and self-contained apparatus suitable for use in schools and teaching establishments, and capable of showing pictures up to 4 ft. 6 in. There is a minimum amount of adjustment required for its use, as once the apparatus has been set up and connected to the supply, all that has to be done is the necessary focussing of the specimen upon the screen. The instrument is soundly constructed throughout. The base is heavy and rigid with handle for lifting. On to it is fitted the main tube of the projector with adjustment for raising, lowering and rotating. The projector has a projection lens and two supplementary lenses of different powers. Thus four magnifications are provided. The lowest is obtained with the projection lens only, the second and third with the supplementary lenses A and B and the fourth by using the two supplementary lenses together. The following table gives the magnification and circle of illumination working at a distance of 10 feet from the screen :— Projection lens only Projection lens and supplementary lens A Projection lens and supplementary lens B Projection lens and supplementary lenses A and B Magnification Circle of illumination 100 150 200 275 2 ft. 6 in. 3 ft. 6 in. 3 ft. 9 in. 4 ft. 6 in. The specimen is held in a spring stage. The lamp is contained in a well ventilated housing and has adjustments for its centration. A smooth and accurate focussing motion is fitted. The lamp is either a 12 volt 48 watt projection lamp or a 50 volt 200 watt. The latter gives a very intense illumination and as, in projection, the best results are obtained with the greatest intensity of light, it is this type we most strongly recommend. No. 2612. Micro projector with 48 watt lamp No. 2612A. Micro projector with 200 watt lamp ... Cooling trough. This can be supplied to cither No. 2612 or No. 2612A, and we recommend it to be supplied in the first instance, otherwise i
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