Practical Hints On the Selection And Use of the Microscope Intended for Beginne
Practical Hints On the Selection And Use of the Microscope Intended for Beginne
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Balsam that is too highly colored may be bleached by exposure to sun- light a process applied by most opticians to the balsam used by them for cementing the lenses of achromatic combinations. Balsam when new is quite fluid, too much so, indeed, for the mounting of most objects. On the other hand, old balsam is thick, and is apt to crack. Microscopists generally keep balsam in wide-mouthed bottles, and take out what is wanted by means of a glass rod. As the process of evaporation, which makes ba...lsam thick and viscid, goes on more slowly in narrow-mouthed bottles, we prefer the latter, and transfer the balsam to the glass slide by means of a fine wire with a small loop at the end. The wire is passed through a cork, or preferably a wooden stopper, and descends to such a depth as to be just below the surface of the balsam. As the latter is used up, the wire is pushed down, and if cemented in its place by the balsam, a little heat soon frees it. The latter remark applies also to the wooden stopper, which is very apt to stick in the neck of the bottle.
What to read after Practical Hints On the Selection And Use of the Microscope Intended for Beginne?
You can find similar books in the "Read Also" column, or choose other free books by John Phin to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
Balsam that is too highly colored may be bleached by exposure to sun- light a process applied by most opticians to the balsam used by them for cementing the lenses of achromatic combinations. Balsam when new is quite fluid, too much so, indeed, for the mounting of most objects. On the other hand, old balsam is thick, and is apt to crack. Microscopists generally keep balsam in wide-mouthed bottles, and take out what is wanted by means of a glass rod. As the process of evaporation, which makes ba...lsam thick and viscid, goes on more slowly in narrow-mouthed bottles, we prefer the latter, and transfer the balsam to the glass slide by means of a fine wire with a small loop at the end. The wire is passed through a cork, or preferably a wooden stopper, and descends to such a depth as to be just below the surface of the balsam. As the latter is used up, the wire is pushed down, and if cemented in its place by the balsam, a little heat soon frees it. The latter remark applies also to the wooden stopper, which is very apt to stick in the neck of the bottle.
What to read after Practical Hints On the Selection And Use of the Microscope Intended for Beginne?
You can find similar books in the "Read Also" column, or choose other free books by John Phin to read onlineMoreLess
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