CALCULATING MACHINE— COOKING BY GAS 
P is, say 20 pounds, and the angle C B D, 
3®, we find 226-18 20 = .4523-6 pounds. 
There are, as has been already stated, 
certain deductions to be made from the 
results in the second column, on account of 
friction and the imperfect rigidity of materi- 
als ; and these deductions increase as we 
diminish the angle C B D. Since, however, 
they may be indefinitely reduced by careful 
construction, it is unnecessary to calculate 
them, if indeed that were possible. 
1 have said that the performance of his 
press answers may expectations ; I send 
you some specimens, that you may judge for 
yourself. 
I am, Sir, 
Your obedient servant, 
Q- 
Aberdeen, July 10, 1835. 
[The “ specimen”s which our ingenious 
correspondent has been so good as to send 
us of his pre.ss, do it great credit- We have 
seldom the good fortune to see swch proofs. 
There is one — a portrait in wood of Eras- 
mus while reading — which is particularly 
good. — E d. M. M.] 
CALCULATING MACHINE -ANO- 
THER RIVAL TO MR. BABBAGE. 
Sir, — Having seen some notices in the pub- 
lic f)apers of calculating machines invented at 
home aad abroad, I think it right to state that 
I have myself invented one, which is exceed- 
ingly simple, and might be made at the same 
expense as a common clock or time-piece. I 
can find the IQ power of ti»e 9 digits in about 
twenty minutes ; in fact, Addition, Subtrac- 
tion, Multiplication, Division, the Rule of 
Three, Involution, Evolution, and a few other 
rule.s, may be worked with despatch and 
facility. The parts of ray machine do not re- 
quire such a critical adaptation, nor are they 
so liable to get out of order, as those of Mr. 
Babbage’s machine ; they may be made by any 
ingenious mechanic, and worked by any way- 
faring man, though a fool. 
1 remain Sir, your humble servant, 
J. S. Hoi L.A.ND. 
Three, Colt-Street, Limehouse. 
The Bude Light is a name given by Mr. 
Gurney (of steam-carriage abortion celebrity) 
toa new light which he. has discovered, and 
so named, after his new place of residence in 
Cornwall. It is obtained by directing a stream 
of oxy hydrogen gas on a quantity of pounded 
egg-shells. The light is represented to be 140 
times greater than any of those now employed 
in lighthouses — so intense, indeed, that Mr. 
G. lately stated to the House of Commons 
Committee on Lighthouses, “ his belief that 
it would he possible to make his light, by 
certain management, point out the precise si- 
tuation of a coast beacon to a ship three or 
four miles at sea, under circumstances of a 
fog so dense that no other light — not even that 
of the sun — could penetrate it to any distance I 
COOKING BY GAS. 
— If any of your long list of readers 
are smitten with the desire of diffusing use- 
ful knowledge, and are in possession of the 
I ^^ak, they will thank me for 
affording them, an opportunity of indulging 
that laudable and fashionable propensity. A 
gas-work has been lately erected in the town, 
pd we are trying to make the heat given out 
in its combustion available for culinary pur- 
posses, or, in humbler phrase, to make it 
boil pots and kettles. We have tried the 
effect of an apparatus recommended in the 
fifteenth volume of your Magazine, page 344, 
and find it answer tolerably well. It consists 
of nothing more than a cylinder of thin sheet 
iron, twelve inches high, six inches wide at 
the bottom, and three at the top ; the bot- 
tom is open, and the top is covered with a 
piece of fine wire gauze (forty-six threads in 
the inch), bound tightly over it by a brass ring. 
The gas pipe being carried two inches up 
the cylinder, the gas gets mixed with common 
air in it, and they ascend together through the 
gauze, and are set fire to at the top. The 
result of many experiments made with this 
machine, and with a larger one of a similar 
nature (but five inches in diameter at the top) 
seems to be, that two quarts of water, in a 
common copper tea-kettle, will be boiled, by 
the application of three feet of gas, whether 
burnt at the rate of ten or of twenty feet in 
the hour. Now, as our price is 12s. 6d- a 
thousand feet, the expense is only a half 
penny, and therefore we may be said to be 
already in possession of the valuable secret 
of making the pot boil. But, if any of your 
readers, as I said before, can put us up to a 
better plan, we shall be much obliged to 
them. I am, &c. 
M, P. 
Hitcliin, May, 7, 1835. 
P- S. — I may add, that our gas is of re- 
markable purity and brilliance, and pleases all 
eyes, without offending any nose. The works 
were built by Mr. West, of Durham, under 
the superintendence of Mr. Lowe. — lUech. 
Mag. 
HOWARD’S VAPOUR ENGINE. 
The Nautilus has arrived at Falmouth with 
latters from Lisbon of the 11th. The Comet, 
which had left Lisbon on the 8th, was obliged 
to put back w ith her machinery out of order. 
The plates immediately in contact with the 
heated quicksilver had burst, and rendered her 
manageable. The mew invention has there- 
fore, so far failed ; 'but it is to have another 
trial. — T'imcs. 
ENGLISH SILVER ORE. 
There was sold last week, at the Bank of 
England, the largest mass of English silver 
ever received into that establishment. I's 
weight was 5741 oz., and its value upwards 
of 1,5000/. It was the produce af a mine in 
the eastern part of Cornw'all, at wdneh ores 
containing from 500 to 10i)0 oz. per ton of 
ore not unfrequently raised. 
