18 
REPORT— 1847. 
On Phosphoric Meteors. By the Rev. T. RAyKiu. 
Over a pond at Huggate, in the Wolds of Yorkshire, richly charged with fht- 
phoric matter from putrescent sources, Mr. Rankin saw, a few years dacf.iii 
evening, a large globular meteor. It was about twn feet in diameter, rosehualk 
leeward side of the pood like a balloon to a height of twenty feet, and then 
decre^ased in she till it disappeared. 
On a singular appearance of the shaded part of the Moon on the Etaafil 
March 18, 1847* Bg the Rev. T. Raskin. 
The appearance was of large luminous spots on the shaded partofthelnaifi*: 
indeed the whole shaded part appeared a mixture of light and shade, hot 4*^ 
part was like the luminous broad top of a mountain. The author imsginritk* 
appearances were due to reflection of tlic light of Sirius, Procyon and otbersaR 
these having suitable positions. 
Mi^corological Observations at Huggate. By the Rev. T. Ransis- 
The author presented tlio results of twelve months'observation with theuBoalusM- 
ments, and mentioned the occurrence of Aurora Borealis on Sept. 13 and 12 , 
Prufesaor Cbevallicr observed the same appearance of the moon, ttaup* 
telescope, on the evening of March Ipth. 
® Triple Biffei'cntial \Vhecl. By J. Lothian. Comniun 
Professor Piaz/.i Smyth of Edinburgh. 
This instrument (which was invented by Mr. James Milne of Edinborgh) 
^ree wheels, placed side by Hide on on axle which passes through their 
The wheels ^ not joined, they have independent movoment. An 
cotnmun to them all. gives them (simultaneous motion in the same direction, liyp 
® of each w-hcel at each turn of the screw. ITie three 
of hke diameter, but h.ive different numbers uf teeth, vi*. 100. 101.105 
graduatious on the rims of the wheels 
a first slipped on tho axTc, and put in gear with the screw, the 
or intervals of the teeth, which in the model are res|«ctively marked 
• j' ****^®^^ B^ftred in the same thread of thcacrew. Thefinj , 
ID jeated on by a stationaiy pointer, marked A on the model. The secoid vJJ 
indicated on by a pointer (B on the model) attached to the first wheel, 
«» indicatwl on fay the pointer C ® u 
travelline with its lOlst or concluding tliriaon. H®** ^ 
‘•"‘t the pointer C is joined to the second wheel by a sherttt^ 
Zdi revolves, and through the bow of which 
wbirli v»i *1 object of thIsarrsngemait beingtoahow^ ^ 
woild be seen at on ths 
'Sh « a' of the wheels transparent. , 
numbered 10. 90. 30, See. “» 
'‘'‘® «*nilarly nurabered, but both of them m a 
iiuodrcd revolutions of the screw, tbc 
fruiu till. fiwt wheel advances one tooth or 
what?, second wheel, that». 100 revolutions of 
Tn^fJ same thing, ouc entire revolution of the first wheel) will 
another 100 revolutions will placcitat2i **^35 
thci^ th number dinoting 100 rcvuIata'nB.-^ 
iomni « the entire mnge which 
ried bv t^ t'^'7 m wheels, and to tlus extent the rf 
JuWwhli. fcounter, which was the inventiun, U « 
of |>u7le^Ji Md if * contrivances, R* 
introduction n/tK^ »|^eulftr parallel motion noticed and rewanledhv^*r*^ tb' 
rex:urS co^K^^• i'^^ance of the Juhan ^ 
urimg combinations of three cycles, and thereby gives great extensioD 
