The book of lantern ; being a practical guide to the working of the optical (1888)

Record Details:

Title:
The book of lantern ; being a practical guide to the working of the optical
Date:
1888
Publisher:
London : Wyman & Sons
Volume:
The book of lantern ; being a practical guide to the working of the optical (or magic) lantern ; with full and precise directions for making and colouring lantern pictures
Leaf #:
00085
Language:
English
Collection:
Books
Format:
Books
Contributor:
University of California Libraries
Sponsor:
MSN
Coordinator:
Media History Digital Library
Date Added:
July 19, 2022
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72 THE BOOK OF THE LANTERX. the cylindrical form, and rubbsd down with a file ; or a piece of good hard chalk will serve, if there is nothing better at hand. The following mixture has been recom- mended as one from which a hard substance can be moulded which will take the place of the usual lime cylinder :— Precipitated Chalk 4 parts. Heavy Magnesia, Carbonate 1 part. Mix to paste with gum-water, and mould to form. Of late years some new limes have been introduced, with the trade-mark "Excelsior." These will do admirably for the blow-through jet, but will not (at any rate in my hands) withstand the attack of a powerful mixed jet. I have always regretted that I cannot use them, for they are uniform in size, are accurately turned and bored, and are packed in a. very convenient manner. A good hard material which will last for several hours, and which is not affected by damp, is a thing that is much wanted for lime- light working. The following extract from Lieut. Drum- mond's paper in the Philosophical Transactions, 1826, is interesting, as showing that the discoverer of the lime-light, made trials of various substances, but found lime to be the best :— " The results of several trials made at the commencement, gave for— Lime 37 times Zirconia 31 times Magnesia 16 times the intensity of an Argand burner. The oxide of zinc was