Of strange Cjlasses.

Z57

cleared, and the letters not so bright; iothatUvy *\ih be clearly discovered, asthey a.e sent in.

Chap. IT.

Other merry spirts with plain boking glcffeS.

N Ow'&.ll annex feme other operations of a plain Glass, described by our Ance-stors, that I may seem to leave cut nothing: and 1 wil! lo augment them, andbring them to a rule, that they may be easily made. I (hill begin witti tais,

How by plain booking-glaffet, the head may appear to be downwards , and the heels

upwards.

If any man by olain Glasses, desires to lee his head downward, and his feet upw-r^(though it i proper forConcave-Glasses io repreienunat) yet 1 will endeavour t°do it by plain Gbsscs. Place two GUsses long-ways, mat they may (tick together?and can no easily ccme asunder, or move here and there, and that they m kc a rightAngle; when this is so done, according to coherence the long wav, set this againstyour face, that in one, halt the face, in the other the other half may be seen; theninclire the Looking-glafie to the right or left hand , looking right int© it, and yourhead will seem to be turned, for according to .heir latitude, they will cut the faceinto two, and the Image will appear lo, as if the head were under, and the heelsupwards; and i s the GUIs be large, the whole body will seem to be inverted. Burthis happens f rom:he mutustand manifold reflection, for it flies from one to theother, that it seems to be turned. We may

Af-hj * plain Glass that (had represent the Image m mi so Id.

A Glass is made that wi 1 make many representations, that is, that many things maybe seen at orce .frr b. opening and shutting it, you (ball see twenty fingers for one,and mere. Y t sb»,l mike it thus: Raile two brass Looking-glasses, or of Cry'Ul,at right ? »g!e neon the fame basis , and let th<m be in a proportion called fe'q'i-alura, thai is oi>e and half, or semeother proportion, add let them be joynedtogether longways, that they may be shut andopenrd, like to a Bock ; and the An-gles be divers, inch as are made at Vei.icc: For one face being ob j rcted,you shall seemany in them both, and this by so much the siraighter, as you put th»mroge.stnr,»ndthe Angles are less : bm they will be diminished by opening them, and the Angerbeing more obtuse, you shall seethe sewrr: sosh*wing ore figure, there will bemore seen: and farther, the right parts will shew right, and the left to be the left,which is contrary to booking-. lasse- ; and this is done by mutual reflection and pul-sation, wher.ee arise th the variety ef Images interchangably. We may

Asak* a Glass of plain Glasses wherein one Image coming , is seen going back^in another.Take rwoplain Glasses . the length whereof shall be double, or one and half to thelatitude, and that for greater convenience: for the prop r ion is rot material}but let them bgr fthe fame lenpth, and < qua’, and laid on the top of a Pillar, iorli-cirg one to theeih r, and so sevn d toyeth.-r; and let them be set upright upon'some plain pace perpendicularly, so the Glasses faf!ned,may be moved on the move-abse fid'. It is no doubt bm voo shall see the Image to come in one, and go backin the ot her Gitse ; and the mare this comes neer, the farther will the other go; andin one will it be seen coming, and in the other going. Also you may fee

h plain Glasses thof things that a t dt tie as tr off, and in other places.

So ntuv * man secretly sec,and without fuspition what is done afar rff, & in other pla-c-s,which otherwise cannot be done: bm vou muse be careful in setting ycUr Glasses-Lrt there be a place appointed in a house or else where, where you may fee any thing,and set a Glase right overa ainst your window, or hole, that may be toward yourface, and let it be set straight up if need were , or fastned to the trail, Moving it hert