Journal - Franklin Institute of the State of Pennsylvania (1826)
Franklin Institute, Philadelphia, Franklin Institute (Philadelphia, Pa.) · [Philadelphia : Franklin Institute] · leaf 305
tands on threelevelling screws. The floor of the apartment is quite level. Thelenses employed for the microscope are those of Mr. William Walesof Fort Lee/New Jersey, specially constructed for bringing theactinic rays to a focus. For powers above the ^th, however, Ihave found that the achromatic… … In taking photographs with this apparatus, I proceed as fellows :The Electric lamp being set in motion, the tal3le holding the micro-scope (which has previously been levelled,) is raised or lowered andmoved from side to side till the centre of the achromatic condenseris brought to the centre of the…
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