In working with the Simple microscope there is a fine chance to display ingenuity, not only in making the instruments and mounting the objects but in discovering new things to look at and in seeing how much can be found out about those things which are the most common.
FOOTNOTE:
[A] In these directions "11⁄2 in. power" means a lens having a focus of 11⁄2 inches; "1⁄2 in. power" means a lens or combination of lenses having a focus of 1⁄2 inch; and so on. All the different powers mentioned in the directions may be obtained in the small-sized 3-lens, bellows form magnifier, either by using the lenses singly or combined in different ways. The magnifying power of any single lens or simple combination is easily found by dividing 10, by the focus in inches. Thus the magnifying power of a 1⁄2 in. lens is found in this way: 10÷1⁄2 = 10×2⁄1 20. The lens magnifies therefore 20 diameters i. e. makes an object appear twenty times as long and twenty times as broad as it is.
TRANSCRIBER'S NOTES:
Inconsistencies in hyphenation have been retained from the original.
Obvious typographical errors have been corrected as follows:
Page 8: hundreth changed to hundredth
Page 11: iustrument changed to instrument
Page 15: diferent changed to different
Page 17: he changed to the
Page 20: wil changed to will
Page 44: or changed to of
Page 72: staightened changed to straightened
Page 86: DIFFRENT changed to DIFFERENT
Page 125: fouths changed to fourths