WATER AND WATER NAVIGATION. 
83 
milled with a number of fmall propellers working within 
thefe fpaces—the propellers being capable of adjuffment 
to any required angle—fuch a veffel fhould not only be 
proof againft finking, but fhould alfo be capable of move¬ 
ment in any direSlion at the will of the engineer, and 
would alfo have the guarantee of a number of propellers, 
in cafe of accident, in place of the rifk of only one. 
And if veffels by the application of apparatus worked 
by motive-power can be floated, why not perfons ? Why 
not mechanical contrivances to leflfen the labour of fwim- 
ming, to make “ treading water ” eafy, fo that people 
could walk out from fhore to veffels, and from veffels to 
fhore, making ££ lifeboats ” fomething more than a name, 
££ life-faving ” a certain ££ art,” rendering water tricycles 
ufeful to merchants and others living out of town on river 
fites, befides much elfe ? 
Finally, and as I have already remarked, the duty and 
the work of changing the prefent order of things in 
the intereft of all mankind belongs to no Angle indi¬ 
vidual. If the theory of mechanical flotation herein 
fet forth fhould prove to be correct, a new field for in¬ 
vention will be opened up, demanding far more inventive 
talent than can ever be hoped for by any one man, and 
certainly more than is claimed by 
The Author. 
Note .—This edition, which confifts of a few hundred copies, is printed with 
a view mainly to private diftribution. To the original three hundred 
printed for diftribution, two hundred have been added for fale to thofe 
who may poflibly feel fufficient intereft in the fubjecft to care to purchafe. 
