442 Of the Bogs in Ireland. 



t€ 30. The engineers are to act under these instructions, 

 in respect to all such bogs within their districts as contain 

 by estimation or repute more than 500 Irish acres ; of hogs 

 of inferior extent, they need only report the existence arid 

 situation. 



" 31. The commissioners intend to provide the best 

 levelling instruments, which they will supply at the original 

 price to such of the surveyors employed as are not already 

 furnished with instruments of sufficient accuracy. They 

 intend also to procure some rain-gauges, to enable them to 

 determine the dimensions of the principal drains. They 

 request that any gentleman disposed to assist bv keeping an 

 account of the rain in the vicinity of the bogs, will be so 

 good as to signify his intentions to their secretary. 

 By order of the Board. 



Dublin Society House, £. M c CarTH^, 



sept. 28, 1809. Secy tQ the Commissioners. 



ADDITIONAL INSTRUCTIONS. 



" 32. The commissioners have determined to alter the 

 longitudinal scales of the sections referred to in the twelfth 

 article of the instructions, from eighty perches to an inch 

 (as therein directed) to forty perches to an inch, the scale 

 which on further consideration they have preferred to adopt. 



M The perpendicular scale of the sections (namely ■^ s - 

 inch to a foot) is to continue unaltered. 



" 33. As it will probably be found inexpedient to incur 

 the expense of engraving the drawings of the sections, re- 

 ferred to in the eleventh article, of the inductions, the en- 

 gineers are to specify the lines of sections, and the amount 

 of fall in each in their reports ; and further to specify them 

 upon their maps, so far as they may find it not inconve- 

 nient to do so. 



"34. The commissioners have determined that, it will 

 not be necessary (at least for (he present) to execute the 

 index maps referred to in the 13th article of the instruc- 

 tions. 



" 35. The engineers are to prepare, for the purpose of 

 being presented to parliament, maps on the scale of two 

 inches to an Irish mile, reduced from their large maps, spe- 

 cifying every thing contained in the large maps. These re- 

 duced maps are to be sent in along with the reports of the 

 engineers to the commissioners. The largest sized copper 

 plate that can be allowed for these maps is twenty-six inches 

 Jong by twenty broad. Where the district is so large that a 

 map of the whole of it cannot be contained within these 



dimensions, 



