BEET SUGAR. ETC.

Daily Southern Cross, Volume XXVIII, Issue 4611, 4 June 1872, Page 3

BEET SUGAR. ETC.

To the Editor : Sir, — How many times can a bone-black filter be used before it requires renewing ? and can a vacuum pan be procured in Auckland ? And ag the liquid has to bo brought up to 238° Fahrenheit in an open boiler, what is the proper heat to bring it up to in a vacuum pan ? Can you or any of your readers inform me what can be douo to cure fowls taken with a disease which appears to be a kind of indigestion, as their crops and gizzards are full of food and it remains there, although they are scoured ? They turn black in the head and die of it in a very short time. — I am, &c, H. H., Riverhead. [Tho number of times that a bone-black filter can be used before requiring to bo renewed would depend altogether upon the quantity of juice put through it each time, and the quantity of colouring matter iv the juice. A filter should be renewed when it ceases to remove all the colouring matters from tho juice. The bone-black can bo renewed by reburning it in a closed vessel. No doubt any of our engineers would bo capable of turning out a vacuum pan were they to receive an order for one. The ( temperature to bring the juice to in a vacuum pan depends very much upon the degree of the vacuum that is produced. The temperature usually ranges from 130° to 150° Pahr. when the granulating point; has been reached. In using the vacuum pan the proof atick is more depended upon than the mere degree of tamperature. The attendant soon becomes such an expert judge by the test with the proof stick, that he requires little instruction from the thermometer when to withdraw the heat and admit the air. The use of the vacuum pan, we believe, would be considered, at least at first, rather too troublesome for working up small quantities of juice. For your fowls try them with a small dose of " pain-killer."— Ed.]