I I V K | 



Jr. 



iisvtio microscope ia infinitely superior, and a 

 regular Boalo of in*trnmontn, nu<:li as thote marked 



A B c D, and supplied with the umial np- 

 pli.-uu'oa, foroepH, oto. , may bo purohaaed at a cost 

 -:il:-iil;itod to aait tho Blonder puning of young people. 

 'I'll" prices of the inntrmimnts, im-lu'linif tho maho- 

 gany boxes into wlii-'h they aro fitted, are about 

 A, 10s. Gd. ; B, 2lB. ; 0, 38a. ; aud D, 45s. 



11 uilmiralilo work tho author met with in 



l.un, pulili*h'd in that city in the year 1770, 



and written by Martin KrohiuH Ledermuller, Consul 



i.f .lii-t !.-,. Su|,,-riiit. !!.!. -at of the Cabinet of 



tory of the Margrave of 



;<1 a most beautiful series of large ini<T<>- 



drawingn, with full letter-preH description, 

 and at in '. i- It at a losa to discover how tho 



image wcmld be pro jrt*d cm to a MTMB or hit Mill 

 wall in a darkened room. 



'ITii* oontriraiKW Utng understood. It ia uy io 

 oe bow, by twing variotuly contrived boss*, tiw 

 picture oooid be thrown on to a ihaet of i*p^r , and 

 accoratoly drawn by a clem tad quick artUt, who 

 inunt. of ooorM, be dependent on th ligfat of UM 

 nn' rayi. 



ittctanot, In Fig. 8 there U the MOM appa, 

 ratoB, rix., th mirror A, by which the rayi of tl* 

 mw would be ooUeotod MM! thrown fatto U* cro- 

 B,fn>m whence they are proJMtad oath* board 

 D of the box CO. In thu arrangemrat UM alid* O>JD. 

 taining the object to b drawn IB apparent .th 

 the limple screw apparatw for getting the fora* 

 of the image thrown from the mkromope. Tb 



<lruwings were taken until he 

 came to the following optical 

 arrangements, in which what is 

 called the solar microscope was 

 evidently used. Tho artist en- 

 gaged on this work has carefully 

 copied the Hollander's drawings, 

 tho first of which is shown 

 at Fig. 7. The looking-glass 

 a b is attached to a movable 

 circle at e, so that the mirror 

 can be turned round to catch the sun- 

 beams, by a strong milled head inside, work- 

 ing a wheel with small cogs pressing against 

 similar cogs in the larger circle. The angle of 

 the reflector is regulated by the rod d, which 

 is jointed at c, and is attached to it at a. 

 The body of lie microscope and tlio tubo 

 containing tho lenses is shown at A A, and 

 the arrangement for obtaining the proper 

 focus is very simple. The slide or cell 

 containing tho live or dead object is shown 

 at 8 8, and when strongly illuminated by 

 tho sun's rays, a very sharp and well-defined 



image cart by the Bun'traji would 

 be BO brilliant and aharp that the 

 draughtsman might easily ait at 

 an open window and copy the 

 pictures in broad daytight, or, ia 

 other words, a darkened roosa 

 would not be neoasaary. 



In Fig. 9 the comfort of the 

 draughtsman U still further 

 studied, because the picture of 

 tho leg of an insect reosiTed, 

 as already described, from the microscope 

 A, is reflected from a mirror, c, arranged at 

 a convenient angle in the box o, and is 

 projected on to the glass plate r r f r, owr 

 which a sheet of India paper may be laid, 

 and upon this the image is brought to a faros 

 and drawn by the artist, who can easily alUr 

 the angle of the box containing the mirror by 

 the screws B, B. The publication of micro- 

 scopic photographs of parts of insects m*j be 

 considered new, but the actnal eontriranc* 

 for making microscopic drawing* direct fross 

 the microscope is not so. 



