KNOVV^LEDGE ♦ 



[Jlly 31, 1885. 



Vol. : 



p_ 241. J si,. , I ' ; ■ •' ' ''I I M Mt tribute the 



telescope and the ojc- shade nut being dark enough. Many of the 

 shades furnished with scxtante are far too hKht-coloured.— Jamfs 

 U. KdBEKTsox. Do you seriously euppose that under the scarcely 

 veiled pretext of describing a manufacturing process I am going gra- 

 tuitously to advertise that you have shares of a company for sale ? 

 — II. F. Tor.N(,. If you wish to form a correspondence class, you 

 must advertise in Mr. L.'a form. It ia absolutely out of the ques- 

 tion that such a class should be formed in connection with Know- 

 ledge itself. You might just as well ask me to lay in a stock of 

 the various articles advertised in these columns, for retailing 

 among its subscribers. — 0. Duncan. Kindly read the paragraghiu 

 capital letters, which concludes those heading the correspondence 

 columns. The conductor has nothing to add to his printed testimonial, 

 which you must consult and draw your own inference from. — Dk. 

 Lewins desires to put on record (for the «th time) that "all Hylo- 

 Idealism requires is the categoric belief that the body is the real 

 man — that this body is piart of, not apart from, the circumambient 

 universe, known to us only by sensation and thought, which are 

 not external entities, but strictly functions, i.e., creations of the 

 same organism itself." lie further wishes to direct the attention 

 of readers to the article ■•Animism" iu the 'Jth edition of the 

 " Encyclopedia Britannica," to the volume on " Cause and Effect " 

 by Dr. Thomas Brown, and to Mr. Eraser's article " On Ghosts " in 

 the Contemporary for July.— Hon. Exam. '85. I have stated over and 

 over again here, that I am not a crammer or coach, and that I 

 must absolutely decline to do sums or solve equations or problems 

 set in any examination whatever. — Alfred Gorston. It could 

 only be accepted as a voluntary contribution. — Capt. F. he Eiche- 

 lieu. Much too long, and not of sufficient popular interest for 

 insertion.— E. W. J. The papers on the " Morality of Happiness " 

 have not as yet been reprinted, ft'hether they will form part of 

 a future volume of the " Knowledge Library Series" has yet to 

 be discussed and decided on.— T. II. GAKirr. Thanks, no. 

 The subject is outside of those to which this journal is 

 devoted. rndonbtcdly, a Platyscopic lens is much more 

 useful as a mi'-ro.-cfpe than a common shilling hand lens. — 

 The Gno.BT of .To,>int"A. Any man who says that the sun at the 

 North Cajie at this (or any other) season remains virtually over 

 the same point of the horizon for twenty-four hours, merely alter- 

 in" its altitude above it, lies— under some astonishing mistake. 

 A.''Bkotiiers. Conductor still in Aff ' 

 image is projected on a distant baekgi 

 strously bigger, as its angular dimensi( 

 could remove a little bush on to the he 

 subtense at the eye, it woidd look lik 



enlargement of the angle under which it is viewed would appear 

 less. — Ec LirsED. The origin of the symbols of the zodiacal signs 

 —as also in fact that of the signs theniselves- is obscure. Some of 

 them are tolerably apparent, c.y., ry the ram's horns; « the boll's 

 head, and so on. The II): concerning which you are exercised, 

 stands for Maria Virgo— the Virgin JInry. Vf is formed by 

 ioinin"- the two letters -p ; the beginning of the Greek word rpjyoc, 

 a goal. ? is the caduceus of Mercury, ? the looking-glass of 

 Venus, S the shield and spear of Mars, n the arm of Jove holding 

 the thunderbolt, h the scythe of Chronos or Siturn, &c.— Joseph 

 KiIiK. However much the ingenuity of your argument would entitle it 



character. Of course you turn professedly literal history into pure 

 allegory— but that is a'detail.— E, A, H. I expect that the Conductor 

 will be in England on or about the 8th prox., when your proposal 

 shall be submitted to him.— A. Korohoff. The Eoman Catholic 

 sect and that of the Greek Church may be all that you aver; but 

 it is utterly out of the question that I should reproduce your appeal 

 to M. Jules Ferry here, or afford space for your claim to be the 

 regenerator of the world.— S. Flo(.d Page. The Directors' Eeports 

 of Commercial Companies can find no place in these columns. — 

 W.M. McKenzie. Needlessly detained through being addressed to 

 the Editnr instead of the publishers. 



spectral 

 lin invariable. K you 

 eforest." rice-rcrs.1, 



#ur Jnbfntorsi* Column. 



1 by Jles 



-, patented by 



t Co., 



the 



plates arc cut obliquely and made t-> 

 pass over one another, in opposite directions, by a parallel 

 motion, the result being that in their transit the bases of the 

 apertures exposing the lower portion of the lens are the first to be 

 uncovered and the last to be closed, thus very greatly increasing 

 the proportionate exposure of that portion of it. 



The movement is communicated to the plates from a coiled etee) 

 spring, by means of .arms with slots, traversing and driving pins in 



A break is attached by which speed can be reduced from an 



exposn 



of t 

 released by the depress 



spring working the plates is 



Btud shown on the bottom of tlie fnrao Tbis is aci_om])iisliea by 

 urging forward a small piston in the cvlindir aditcent to the stud 

 'evicc pitented Iv Cadet i^ employed for tin's 



-H G Nomngton of Bonhay road 

 mple but effectivi fastener for fixing 



"iheeto now generilly coming into use 

 3 It 13 aj plied b ] T chmg a hole on 

 in the sheet inserting tie enl of the 



when it draws itself ii ti the rak until 

 faxes down the si eet 11 e 



•ring 



nade I belt arc many advantages a] ] arent to a 



Mit hiMnT to wait for a thatcher Cur^cl 

 he ridgc^i and ventilation if necessary ci 

 the space bctncen the ha-i and tl e u Ige 



SLIDING SEVT FOP 1 VCI\( BO\^T 



the seat lun 1 is 



to be off her 1 \(_1 k 1 tl « rku tl tie = u i^ i t II ted 

 The diffeience claimed tlcrefoie in the working of theoidinaiv 

 sliding seat and the ' Imiro^ed Sliding Seat is —That the 

 amount of force which is lequired to om rcomc fiiction in the 

 former is with the im[ roved seat made avail ible foi materially 

 increasing the spec 1 of tl t boat W ith this invei ti n therefore, a 

 speed can be attuned wIkI it is impossiUe t> ) i luce by the use 

 of the ordinary sliding scat The Uttei biais dircctlv upon thi 

 slide rods without any medium whilst the Impioved seat hai 

 rjlleis fitted betneen the wooden seat and slilc rods which cause 

 the seat to ran easier than the ordm iry sliding seat 



