Queries atid Ansivers. 



769 



129 



garden in that village, this plant and the crimson grass vetch 

 (Zathyrus Nissoh'« L.), found wild in that neighbourhood, 

 have been cultivated for many years without any difficulty, and 

 there is always an abundance of self-sown plants. — Aliqiiis, 

 Manchester, March 21. 1832. 



Instruments for facilitating E. H. G.'s Meteorological Studies. 

 (p. 688.) — He will want a night and day thermometer, with 

 a register or index. Each of these may be had separate (for 

 about 75. or 7^. 6d. each), or both may be procured on one 

 frame, with, I believe, in that case, steel indices ; but the best 

 instrument is Six's night and day register thermometer, price, 

 at Gary's (181. Strand), IL 16s, This requires a magnet, to 

 adjust, daily, each index, which will cost 2s. 6d. It is requisite, 

 also, to have a* pluviometer or rain gauge, which any tinman 

 could make him, of tin, or copper tinned : the form is not 

 material, provided the receiver be of precisely the same size, 

 throughout its whole depth, as the receiving surface. My 

 own consists of a funnel [Jig. 129. a). Sin. square, fixed 

 upon the reservoir (b\ by soldering. 

 Through the neck of this is inserted a 

 graduated stem (c), terminating in the 

 cork ball (d\ which floats upon the 

 surface of the water, the stem mark- 

 ing in fractions of inches the depth 

 of rain fallen ; and, lastly, a stopcock 

 [e\ to let off the water once a month, 

 or oftener, as required. A single 

 night register thermometer is useful 

 as a check upon the double (or Six's). 

 It would be desirable to add a hy- 

 grometric column to the calendar; 

 and, for this purpose, Mr. Daniell's would be the most 

 delicate, and probably most accurate, hygrometer: the price 

 I do not know ; but the instrument is described in Mr. 

 Ty?iX\iQ\Vs Meteorological Essays and Observations, price, I think, 

 \l. Is. The velocities of the wind, as well as its direction, 

 might also be added; but I do not know an anemometer 

 sufficiently simple to give an accurate idea by a hasty glance 

 merely. — Sigma. Saffron Walden, Sept. 25. 1832. 



Two formularies for an anemometer are described in the 

 Gardener^ s Magazine, vol. vii. p. 231. 618. — J. JD. 



The Transit of Mercury observed in London. — Mr. Dovas- 

 ton asks (p. 504.) where the transit of Mercury was observed. 

 I reside in the vicinity of the Tower of London, and have not 

 the means of " hoisting an old Galileo, or of using a long 

 Sidrophel ;" but, with a Gregorian reflector of 4 ft., I observed 

 Vol. V. — No. 30. 3 d 



