The first job a-la-Hindle is by Paul Linde of Crossville, Tennessee, who went under the wire April 22 with the telescope shown above. He has little to say about it. "I finally finished the 10-inch Cassegrainian," he writes, "and it came out to be just about right-not quite as good as it could be, but much better than I expected. With a half-inch eyepiece it brings out the details of the moon's surface very clearly and sharply. I expect to make another and larger one next winter."

Running in and out of North Platte Nebraska, with his freight engine is our old friend H. O. Bergstrom, engineman, who has been a telescope making addict for several years, his first job being shown in "Amateur Telescope Making," page 71. Mr. Bergstrom writes us that he is about to abandon the throttle and take up farming, but is still interested in telescope making. His Cassegrainian, shown on this page, was made before the Hindle instructions became available. Incidentally, he says he stumbled on to the Hindle test independently. His telescope employs a diagonal near the primary, in addition to the secondary convex mirror, throwing the light out-to the side. This is a well-established practice employed on some of the large telescopes.

In the May number we showed a photograph of a 15-inch Cassegrainian telescope made by Dr. H. Page Bailey of Riverside, California, and this, too, employed a diagonal in addition to the regular secondary. Dr. Bailey has also made a 24-inch Cassegrainian mounting of similar type, shown at the bottom of the page. This mounting temporarily carries a 16-inch primary mirror and was made by him (presented, it is said) for the Richardson Observatory at the San Bernardino Valley Union Junior College. Incidentally, Dr. Bailey reflects some of the pessimism regarding the quality of the Cassegrainian contained in Russell W. Porter's chapter on that type (A.T.M., page 64) when he says, "I much prefer my 12-inch Newtonian for personal use. It has a large field and lots of light."

It is about time we created a new "Birthday List of Honors," as the King of England does (we hope you gather the modest inference), since several new workers have now qualified for membership in the Cassegrainian Club. Mr. Linde is hereby dubbed a Nabob or, properly speaking, in India a Nawab; Mr. Bergstrom, now that he has shifted to farming, is to be called a Field Marshal; Dr. Bailey a Maharajah; Harold Lower, whose 12-inch Cassegrainian was shown in the May number, a Shiek, as he lives not far from a desert. All you have to do to win fame and a title is to finish a Cassegrainian.

But, avast this nonsense.

In the June number we published a list of amateur telescope maker's clubs. To this list should now be added "The Amateur Telescope Makers and Astronomers of Grays Harbor," Washington, with 11 members in April and growing. Seven telescopes are sported by this young organization. Its members are studying astronomy, a chapter of Russell, Dugan and Stewart's "Astronomy" having been assigned to each for report at meetings. C. H. Rose of Aberdeen, Washington, is the secretary, and correspondence with other amateurs is invited by this organization.

A great deal of correspondence is constantly going on among amateurs throughout the country and in fact throughout the whole world. That is one purpose we originally had when we began publishing the full addresses of amateurs whose telescopes have been described. It has drawn very many of the fraternity together and made many friends.

We learn that a society of amateurs, teachers, college professors and others has been organized in Providence, Rhode Island, under the name of "The Skyscrapers' Amateur Astronomical Society of Rhode Island." If you are interested in astronomy you are invited to apply for membership The president is the Rev. J. G. Crawford of Saunderstown, Rhode Island, who has a church at Wakefield, same state, and is known locally as "The Vicar of Wakefield." The Rev. Mr. Crawford has made a fine 10-inch telescope and observatory, of which we have a photograph but as yet no description.

"The Astroscope" is the name of a budding periodical issued by the "Amateur Telescope Makers of Chicago," at 10728 Artesian Avenue, Chicago. W. S. Buttles, editor. The Chicago amateurs are invading astrophysics. Papers read before a recent meeting were entitled: "The Structure of the Atom and the Interpretation of the Spectrum"; "The Possibilities of Large Telescopes"; and so on. It sounds professional. Someone, evidently possessed of standardizing inclinations, appears to have had his way in this club, for we learn that the telescopes are to be standardized on two focal lengths: three feet and six feet; designs are to be "standardized;" drawings, patterns and castings will be made available; polar axes are to be of steel, cells and tubes aluminum-that is, "standardized." Are we not already too standardized in this country?

In Pittsburgh the "Astronomical Section of the Academy of Science and Art" has been studying too. Here is the program of a recent meeting: "Stellar Magnitude of the Sun," by Arnold; "Sizes of the Solar, Lunar, and Planetary Disks in the Telescope-How Determined," by Seiple; "Dingle's Introduction to Modern Astrophysics by Souther. Leo J. Scanlon is the secretary. They met on Friday, the 13th, too-probably all dead by now.

It is a long time since we have published descriptions of any plain, simple Newtonian telescopes made by amateurs, as we used to, though we have exactly 40 such descriptions on hand at present. Such telescopes as this have been made by hundreds of previously inexperienced amateurs, using the practical instructions in the SCIENTIFIC AMERICAN book "Amateur Telescope Making." "I have worked many kinds of materials but this experience with glass has been extremely interesting," J. A. Heard, 4306 Belvieu Avenue, Baltimore, Maryland, writes, concerning his telescope. "The mounting is of the Springfield type with some slight changes in detail. I have used a 0.3.inch eyepiece and find wonderful definition right out to the edge." Such a telescope will magnify 50 to 100 diameters and enable its owner to perform serious astronomical work. The cost is low-about 25 or 50 dollars, plus some hard work. All this is stated for the information of new readers who have not previously followed this department and become inoculated with the telescope making bug. Jump in.

There has been some question as to who originated the slit test described last month. Evidently no one person was wholly responsible. the idea was a growth. Porter's notebook dated 1918 contains a detailed sketch of it, he only recently developed it. Anderson, Carpenter, Jacobson, others, contributed. Two amateurs independently hit on it and used it: James Critchett of Julian, California, and Daniel E. McGuire of Shadyside, Ohio. Porter put it on the map and had the most to do with it, but it's nobody's test.

Finally, don't forget the annual get-together of amateur telescope makers, to be held at Stellafane, Springfield, Vermont, Saturday August 27. Come by train, motor, 'plane, or shank's mares. For information, write 'The Telescope Makers of Springfield," Springfield, Vermont.

The Society for Amateur Scientists (SAS) is a nonprofit research and educational organization dedicated to helping people enrich their lives by following their passion to take part in scientific adventures of all kinds.