Aug. 1, 1884.] 



♦ KNOWLEDGE 



89 



invariably run in front of the machine, instead of out of 

 its way. 



One of the most pleasurable features of tricycling to my 

 mind is descending hills at considei-able speed, and on this 

 machine the rider may do so at all times safely without 

 being robbed of his pleasure by a constant dread of the 

 brake snapping or not acting in some way in case of 

 emergency. 



The machine is also supplied with comfortable, rubber- 

 clothed foot-rests, which, besides being a great luxury in 

 riding down-hill, enable the rider on a good level road 

 to take an additional rest by pedalling with alternate 

 feet. 



But the best feature of the machine is its patent auto- 

 matic balance-gearing, an illustration of which is here 

 given (through the kindness of Messrs. Starley Bros., of 

 Coventry). 



A. — Bevel tootli-wheel, fixed to the hub of one driving-wheel. 

 B. — Crown-wheel. C. — Bevel-wheel fixed to shaft. D. — Main 

 axle. E. — Chain-wheel. 



The axle connecting the two large driving-wheels is tele- 

 scopic, the central shaft from the right wheel working in a 

 hollow tube from the left. 



The chain-wheel works between two bevelled cog-wheels, 

 one of which is attached to the hub of the right-hand 

 driving-wheel, while the other is attached to the end of the 

 hollow shaft that proceeds from the left hand. 



Between the two cog-wheels works loosely the collar 

 that forms the centre of the toothed chain-wheel, while on 

 a rod which passes from the centre to the circumference of 

 the chain-wheel works a small, loose cog-wheel, whose 

 teeth are so bevelled as to work against the teeth of the 

 other two cog-wheels. 



While the machine is being driven in a straight course, 

 the teeth of the little cog-wheel press evenly against the 

 teeth of the other two cogs, and equal power is by this 

 .means imparted to both driving-wheels. But should one 

 wheel be rotated more slowly than the other, as in turning 

 corners or steering the machine completely round, the little 

 cog or pinion-wheel glides freely over the face of the 

 Vievelled cogs that move the inner or slowly - rotating 

 ■wheel, while it presses with more force against the cogs of 

 the outer wheel, thus causing it to rotate with greater 

 speed. 



The great advantage of this simple mechanism is at once 

 apparent in the facility it gives of turning sharp curves 

 without the risk of the machine tilting over. It also can 

 be worked backwards or forwards with equal eflfect. While 

 at all times the machine, by the use of this gearing, is 

 kept thoroughly under control. With reference to its 



luggage-carrying capability, there are few machines to 

 surpass it, the amount of articles one can fasten to 

 the detachable luggage-carrier behind being something 

 prodigiou?. 



It is in consequence a capital machine for an amateur 

 photographer who wishes to take sufficient paraphernalia to 

 photo any lovely bit of scenery he may meet with on his 

 tour. 



I advise those persons, however, who are above the 

 average weight, or who live in a district where roads are 

 bad, to ride an ordinary " Salvo," on account of its greater 

 strength ; whereas, on the other hand, for ladies, or those 

 whose weight does not exceed 10 St., and who are fortunate 

 enough to live in a neighbourhood of good level roads, 

 with smooth surface, I strongly recommend their " Special 

 Light Salvo." 



With regard to height of wheels, I should recommend a 

 46-in., geared level, for those whose height does not exceed 

 5 ft. 9 in., and a 48-in., geared level, for those above this 

 height. 



Undoubtedly the " Royal Salvo " No. II. is one of the 

 very best machines made. F. 



EMBALMERS. 



11H0UGH in America embalming be on the increase 

 and even bids fair to be one day popular, there can 

 be no doubt that with us the practice does not gain 

 ground. 



We are a sensible rather than a sensitive people, and, 

 unable to grasp any very definite reason for encouraging the 

 art, we scarcely notice it. We have, in fact, no desire to 

 have our dead, like our poor, always with us. But, never- 

 theless, there are in each year a certain number of cases of 

 tolerably regular occurrence, and, to meet that demand, 

 a small supply of practitioners, authorities on the subject, 

 employed by the undertaker, who, as a rule, is the person 

 first consulted. 



Compared with the ancient, the modern method is 

 rapid and simple ; with the Egyptians, the process was 

 a question of months, with us it is one almost of 

 minutes. 



Here it is, as practised by Dr. B. W, Richardson, the 

 eminent authority on health, who has probably had a wider 

 and longer experience than any other man in the country. 

 " A large artery is exposed and opened, and into the vessel 

 a hollow needle is inserted. The needle is firmly tied in 

 its place. Through the needle a solution of chloride of zinc 

 is injected slowly until it has found its way over every 

 part. The principal art that is required in this process is 

 to be very careful not to use too much force in driving 

 the fluid into the tissues, and in not using too much fluid. 

 The fluid which answers best is made as follows : — To two 

 pints of water, at 50° Fahr., add chloride of zinc slowly, 

 until the water just refuses to take up any more of the 

 salt. Then add one pint of water more, and two pints of 

 methylated spirit. The five pints so produced are a 

 suflioient quantity for embalming an adult body. The 

 solution can be injected quite cold, and it will find its way 

 readily over the vessels. If expense be not considered, 

 pure alcohol may be used instead of the methylated 

 spirit. 



The efiect of the solution is shown by its making the svr- 

 faoe of the skin white, firm, and, for a short time, slightly 

 mottled." We have this eminent authority's permission to 

 add that the latest improvement (a discovery of his own, 



