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Microscope

Microscope.png PedrailThumbnailsImproved high speed engine and dynamoPedrailThumbnailsImproved high speed engine and dynamoPedrailThumbnailsImproved high speed engine and dynamoPedrailThumbnailsImproved high speed engine and dynamoPedrailThumbnailsImproved high speed engine and dynamoPedrailThumbnailsImproved high speed engine and dynamoPedrailThumbnailsImproved high speed engine and dynamo

The Instrument is this. I prepare a pretty capaceous Bolt-head AB, with a small stem about two foot and a half long DC; upon the end of this D I put on a small bended Glass, or brazen syphon DEF (open at D, E and F, but to be closed with cement at F and E, as occasion serves) whose stem F should be about six or eight inches long, but the bore of it not above half an inch diameter, and very even; these I fix very strongly together by the help of very hard Cement, and then fit the whole Glass ABCDEF into a long Board, or Frame, in such manner, that almost half the head AB may lye buried in a concave Hemisphere cut into the Board ...