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Tesseract, v. 2, issue 1, January 1937
13
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TELESCOPE TOPICS, 13 This column will be devoted to the more concrete and practical subject of amateur telescopes. The subject matter whenever possible will be composed of descriptions of telescopes built by members of the SFAA. When no such descriptions are available, the space will be taken up by articles on various topics associated with telescopes and astronomy. In order that this plan may be a success we ask that all members please send to ARTHUR R. MINK, in care of TESSERACT, Accounts, drawings and pictures of their work. These will form the subject of future columns. Endeavors of our members in other fields closely allied to Astronomy will be used if possible. For those who have never done anything in this field, we recommend that you read any of the following references and get into this fascinating hobby. 1 - "Amateur Telescope Making" by A.G. Ingalls - may be found in any library, almost. If it is not available the next best thing will be found in the "Scientific American Magazine" Vol: 134, Page 86. There are interesting descriptions of amateur telescopes in every issue of the "Scientific American". THIS MONTH'S TELESCOPE In this initial column we are using a design by the column editor as we have no other accounts on hand. The telescope mounting is of the Springfield or stationary eyepiece type which does away with the inconvenience of cramped positions while observing. This particular 'scope is equped with a 5" plate-glass mirror and is capable of magnification up to 300 diameters. It has a light-gathering power 2400 times that of the human eye. The instrument is pictured in the center of the page (illustration by ARM). The base, "B" is of concrete and about 3 feet high; 16" at the base and 10" at the top. Securely bolted to the base is a right triangle whose legs are 8" by 7 3/4", the angle at "D" being exactly equal to the latitude of Poise, where the instrument will be used. On top of this is the cylinder carrying the eyepiece, "E". This cylinder turns about on a shaft perpendicular to block "D". It also carries the axle about which the tube "T", pivots. "A" in the picture is a super-structure built upon the tube to strengthen the joining of the tube and the eyepiece-carrying block. The shaded portions about the block and at "D" are cold rolled steel which is used to face the wooden blocks. This type of construction is considerably cheaper than the use of castings. The weight "C", is the counter-balance and is adjusted to just balance the weight of the 'scope so it will stay at any position it may be set in. The optical parts are removable for safe keeping. It is our hope that this column will instill in its readers a deeper interest in science to the end that the SFAA will become a power in science as well as science fiction. Remember, we are counting on you to make our experiment a success. ARTHUR R. MINK, Column Editor (Editor's note. Tell us what you think of this column and whether or not you wish the author to detail some practical pointers and theories of telescope construction.) --------- Correction: In A. R. MInk's December Column, paragraph 5 interchange 'brightline' and 'dark-line' in sentences 4 and 5. (Science Editor).
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TELESCOPE TOPICS, 13 This column will be devoted to the more concrete and practical subject of amateur telescopes. The subject matter whenever possible will be composed of descriptions of telescopes built by members of the SFAA. When no such descriptions are available, the space will be taken up by articles on various topics associated with telescopes and astronomy. In order that this plan may be a success we ask that all members please send to ARTHUR R. MINK, in care of TESSERACT, Accounts, drawings and pictures of their work. These will form the subject of future columns. Endeavors of our members in other fields closely allied to Astronomy will be used if possible. For those who have never done anything in this field, we recommend that you read any of the following references and get into this fascinating hobby. 1 - "Amateur Telescope Making" by A.G. Ingalls - may be found in any library, almost. If it is not available the next best thing will be found in the "Scientific American Magazine" Vol: 134, Page 86. There are interesting descriptions of amateur telescopes in every issue of the "Scientific American". THIS MONTH'S TELESCOPE In this initial column we are using a design by the column editor as we have no other accounts on hand. The telescope mounting is of the Springfield or stationary eyepiece type which does away with the inconvenience of cramped positions while observing. This particular 'scope is equped with a 5" plate-glass mirror and is capable of magnification up to 300 diameters. It has a light-gathering power 2400 times that of the human eye. The instrument is pictured in the center of the page (illustration by ARM). The base, "B" is of concrete and about 3 feet high; 16" at the base and 10" at the top. Securely bolted to the base is a right triangle whose legs are 8" by 7 3/4", the angle at "D" being exactly equal to the latitude of Poise, where the instrument will be used. On top of this is the cylinder carrying the eyepiece, "E". This cylinder turns about on a shaft perpendicular to block "D". It also carries the axle about which the tube "T", pivots. "A" in the picture is a super-structure built upon the tube to strengthen the joining of the tube and the eyepiece-carrying block. The shaded portions about the block and at "D" are cold rolled steel which is used to face the wooden blocks. This type of construction is considerably cheaper than the use of castings. The weight "C", is the counter-balance and is adjusted to just balance the weight of the 'scope so it will stay at any position it may be set in. The optical parts are removable for safe keeping. It is our hope that this column will instill in its readers a deeper interest in science to the end that the SFAA will become a power in science as well as science fiction. Remember, we are counting on you to make our experiment a success. ARTHUR R. MINK, Column Editor (Editor's note. Tell us what you think of this column and whether or not you wish the author to detail some practical pointers and theories of telescope construction.) --------- Correction: In A. R. MInk's December Column, paragraph 5 interchange 'brightline' and 'dark-line' in sentences 4 and 5. (Science Editor).
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