On Floating Bodies , &ci 31- 



U also made with it, which, when apphed upon copper or 

 •ilvcp, furnishes a colour precisely similar to that uf fine 

 gold, and imitates this bright metal extremely well when 

 applied in thin leaves to other metals: a colour which, I 

 think, cannot be obtained in the same degree of perfection 

 with any other metal. 



I shall not dwell upon the difTerent varieties of chromates 

 of lead used in painting: they arc already well known to- 

 artists, and arc in great request on account of their beau- 

 tiful colours, the facility with which they may be applied, 

 and their great inalterability. 



It is very probable that several other metallic chromateg 

 would also furnish beautiful colours if they were properly 

 examined by painters. 



IV. Ohscrvations on loaded and unloaded Barges, Boats^ 

 Beams, or floating Bodies descending with Streams or 

 Currents, and wtiy the heavier End will go foremost^ 

 By George Orb, Esq, 



In addition to what I have already said on this subject, I. 

 now submit what follows to the consideration of scientific 

 men : and as my object is an endeavour to attain the truth 

 on so interesting a subject, I am ever ready to admit mv 

 errors where 1 am wrong, but hope that reason and good 

 temper, free from peevishness and personality, will evciv 

 regulate the discussion of philosophical subjects. 



Wiien bodies of the dcscrintion alluded to, or in fact any 

 bodies that are specifically lijibter than water*, float in it, 

 there are two powers always opposed to each other, that is, 

 the specific g'-avities oF the fluid and of tb.e floating body; 

 and in proportion as these differ more or less, in the same 

 proportion will the two bodies oppose each other : for the less 

 specifically heavy any float in^' i)ody is, the less power will it 

 possess to contend against the fluid in its endeavours to sink or 

 descend ; and of course it will follow that it will float nearer 

 the surface. When water is perfectly at rest, it has found its 

 level, and its surface presents ahf^rizontal plane; or in other 

 words, all its particles press or gravitate toward;r the centre 

 of the earth in pcrpemliculir and right lines; but on any 

 change from this slate of rest taking place, the particles of 

 water are, by the force of gravitation, put in nioiion, and 

 will endeavour to find their levari again, or continue to move 

 on an inclined plane; and all bodies suspended in the fluid, 

 •r fi^oating on the . surface more or less deep, beiiig subject. 

 * * to 



