Book IX. Mechanicl Pomeyx. 195leſſer digreſſions, its reciprocations nevertheleſs throughout areequal in time one to another.

Fig. 134. In the figure of the former Clock the plane isAB, the circle of the Ballance, or compaſs about the tongueof che ballance C D, its axis or lance EF; the wing or ſpringturn'd into a ſpire G H M is faſtned to the ſpear of che bal-lance in M, and to the thin plate of mettal on the upper planeof the Clock in G , ſo truly, chat all the ſpires of the ſpringcleave to theſe tO props hanged up in the air, touching no-thing beneath: N OP Qis a certam covering, or propping,in which che other point of the ballance is turned: RS is oneof the toothed Wheels of the Clock , having a certain motionof the poiſer impreſt on it from meeting with the next wheel,and tbis wheel R is folded into the Tympane T, made faſtto the axis or ſpear of the poiſer, whoſe motion is by this meansas much ruaintain'd as there is occaſion.

This Invention of Hugenius may be uſed not only in Watches, and portable Clocks , but alſo in others which are put intomotion by hang weights; and to which he adds, That a clockmade by the foreſaid Artifice may be ſerviceable in findingthe Longitude at Land and Sea, which J am not eaſily indu-ced to believe, for neither is the inequallity of motion of Clocks more corrected by this Invention chan by Pendulums , as youmay eaſily underſtand by what is ſaid, nevertheleſs tis veryuſeful, becauſe it may be fitted to portable Clocks, or Watches,which cannot ſuffer a Pendulum . a

Fig. 135. I obſerve that the ſpear of che ballance EF mayagitate, and unleſs I am miſtaken, more benefcially by à Zoneor double Wheel with ſmooth teeth, or little keys after thatmanner, whereby a pendulum agitates in the fifth problem, towit, if the little keys C, D, G, H, Cc. by turns, or one afteranother, hit againſt the two little wings A and B, here andthere fixt to the ſame ſpear or lance; for ſince this ſpear oughtto be much thicker and ſtronger than commonly they are wontin common Clocks, and more reſiſts the impulſes of the wheel8 k, by reaſon of the ſpire G H endeavouring againſt it, thepoiſing wheel commonly call'd Serpentine is not ſo uſeful,Which is wont to agitate the common ſpear of the Ballance.

Cc 2 problem