6:8 



NA TURE 



[OCTOUER 25, 1894 



Fig. I. — Long-period meteorograph for the Mont Blanc Observatory, a, clock to run eight months; B, barometric recording system : c. mercurT" 

 barometer; u, registering anemometer and anemoscope: k. pen of thermometer; P, pen of hyuronieter ; e', reservoir of thermometer ; F^ 

 hairs of hygrometer ; G, c, g, counterpo.ses for ensuring the regular movement of the paper spindles ; 11, pendulum of clock ; i, transmitter of 

 the clock-movement to the different recording systems. 



■2. — \" r-..; r-i— -.y .1- in shi^* n at 1 ■ in l-i;;. 1. No. I. K', K, Connections of the vane and ancmnmcirr wiit. 



the r- . f velocity ot wind (anemomelcr) ; l', cogwheel fi^r direction of wind (anemoscope) ; ^t, group of recordmt; 



pen* . 1 >r paper upon which rccirds have been traced ; »•. system actuated by the ct>unterpoise '•• and serving t" 



roll up tti-. 11 .« i p.prr Nn. ,. OTicral view of the writing system, q. o', buttons for lifting the pcni ; k. _k', rollers actuated by the cog-wheels t 

 and L ; T, detail of the pen-tube of the anemoscope ; u, detail of the (ten-tube of the anemometer ; V, series of pen-tubes. 



NO. I. •504. VOL. 50] 



