206 Memo, on the subject of Bain Gauges, [no. 2, new series. 



comparison of their respective indications made. This could most 

 conveniently be done at the Honorable Company's Observatory, 

 there being no such thing as a standard Rain Gauge in the Mint. 



[Agreeably to Colonel Smith's recommendation, 6 Ruin Gauges answering to 

 Mr, Bayley's description were ordered to be made up and tested at the Honora- 

 ble Company's Observatory. 'I he following is an extract of a letter from Major 

 "Worster, the Honorable Company's Astronomer with reference thereto.] 



Several of these Gauges, &c. have already been tried with the 

 standard Gauge of this Observatory, and as there can be no doubt 

 whatever of the accuracy of the result if the rim is truly formed to 

 the given diameter, it would appear to be an unnecessary loss of 

 time in detaining the Gauges here when they could be more usefully 

 employed in the interior. 



Tin plate however can scarcely be formed on a mould to a truly 

 cylindrical shape, and it would be far better to form the rims of 

 brass and turned to the given dimensions, the tin funnels being 

 subsequently soldered on to complete the Gauges. The expense 

 of these rings would be but trifling. 



M no U . i iam 4-696 The six tin Gau g es ( witn their measures) have 

 thV i 4-683 been Prepared, the diameters of which are noted in 

 J&S till the margin. 



No. 6 4691 



[In order to judge of the advisability of substituting the improved Gauge for 

 the less convenient pattern in use, letters on the subject were addressed to the differ- 

 ent Collectors inviting their opinions thereupon. Colonel Faber, the Chief Engi- 

 neer, upon the receipt of their replies, submitted to Government a concise narra- 

 tive of the whole project, of which the following is an extract.] 



The Collector of Malabar states that the j?rs used for receiving 

 the rain water are glazed so that they are not open to the objection 

 of being porous but that he wishes to have one of the new pattern 

 for trial. 



The Collector of Canara states that the new pattern will not 

 answer on the Western Coast as 9 inches of rain have fallen in 24 

 hours at Mangalore. 



The Collector of Nellore has written two letters on the subject ; 

 in the first dated 29th April 1856 he states that the Talook Officers 

 are quite familiar with the pattern now in use, that the method of 

 taking and registering the measurements causes no confusion of 



