(from Page 4)
The Glass placed in the manner of the Barrel Box, Fig. N. is only to be used with the Brass Instruments Q and V (or in your Hand) being the least Magnifier for greater Objects such as Flies, and common Insects.
In the viewing of Objects, one ought to be careful not to hinder the Light to fall upon them by Hat, Peruke, or any other thing, especially when they are to look upon Opake Objects; for nothing can be seen with the best of Glasses, unless the Object be in a due distance, with sufficient Light.
The best Lights for the Plates or Sliders, where the Object lies between two Glasses, is a clear Sky Light or where the Sun shines on any white thing, or the Reflection of the Light from a Looking-Glass. Light of a Candle is likewise good for viewing small Objects, tho’ it be a little uneasie to those who are not practised (sic) in Microscopes, to find out the Light of the Candle.
To this Set of Single Microscopes, (for such Gentlemen that are dispos’d to buy them) there being a small Double Microscope which may be used with two different ways, either for viewing Transparent, or Opake Objects there are three different Magnifying Glasses belonging to it set in Brass, which are to be screw’d onto the Object end of the Double Microscope, which end is to be screw’d into the Instrument Q; for the viewing of any Object fix’d on the Point, Tongs, or on the Black and White, which belongs to the Instrument P, which Instrument is to be slid in between the 2 thin brass Plates EE, and by the help of the long Screw D you may easily bring the Object to its proper Distance.
2. When you are desirous to use it, to look at any of the Objects fix’d in the flat pieces of Ivory d d d d, or to see the Circulation of the Blood in a small Fish, the Animalcula in the Liquids, there is a feril (sic) of Brass which is to be screw’d on to the Body of the Microscope CB over any of the single Glasses M. then may you thro’ the Double Micros. see the Object magnify’d to a prodigious bigness, always remembering the long screw D.serves (sic) to adjust the Object to its true distance from the Magnifying Glass.
