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Sentences for "condenser "
The substage condenser is a necessary part of the optical outfit.
Vertical movement of the entire substage apparatus effected by means of a rack and pinion is a decided advantage, and some means should be provided for temporarily removing the condenser from the optical axis of the microscope.
The best Abbé condenser transmits a cone of about .
4, hence, the efficiency of these lenses is much curtailed if the condenser is merely[Pg 55] the Abbé.
-Below the substage condenser is attached a gymbal carrying a reversible circular frame with a plane mirror on one side and a concave mirror on the other (Fig.
The plane mirror is that usually employed, but occasionally, as for example when using low powers and with the condenser racked down and thrown out of the optical axis, the concave mirror is used.
If immersion oil contact is made between the top lens of the condenser and the lower surface of the bulb, this stage works very well indeed with the 1/12-inch oil immersion lens.
-This is an immersion substage condenser of high aperture by means of which unstained objects such as bacteria can be shown as bright white particles upon a dense black background.
The central rays of light are blocked out by means of an opaque stop while the peripheral rays are reflected from the paraboloidal sides of the condenser and refracted by the object viewed.
To obtain the best results with this type of condenser a powerful illuminant-such as a small arc lamp or an incandescent gas lamp-is needed, together with picked slides of a certain thickness (specified for the[Pg 61] particular make of condenser but generally 1 mm.
Rack the condenser down slightly and cut down the aperture of the iris diaphragm so that the light, although even, is dim.
Remove the substage condenser and replace it by the dark ground condenser.
(This should be the Liliput Arc Lamp (Leitz), Nernst Lamp or incandescent gas lamp; if either of the two latter are employed, a bull's eye condenser to produce parallel rays must be interposed between light and microscope); and adjust illuminant and microscope so that the substage plane mirror is completely filled with light.
Focus the two concentric rings engraved upon the upper surface of the condenser and centre them accurately by means of the centring screws.
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