An Introduction to Leathercraft by Paul Hughes
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Practical Implementation of the Stream Function Method for Design of Arbitrary-Geometry Gradient Coils
Practical Implementation of the Stream Function Method for Design of Arbitrary-Geometry Gradient Coils R. A. Lemdiasov1, R. Ludwig2 1Insight Neuroimaging Systems, Worcester, MA, United States, 2ECE Department, Worcester Polytechnic Institute, Worcester, MA, United States Introduction Over the past several years a variety of theoretical design methods for the construction of gradient coils have been developed. For instance, in [1] D. Green et al. minimize a weighted combination of power, inductance, and the square difference between actual and desired field. Representing the current as a Fourier series they find optimal coefficients that minimize the cost function. Our work is a continuation of last year’s research reported in [2]. In this paper we describe an alternative implementation of a stream function method to design gradient coils. Using this method we are able to determine the current distribution to achieve a prescribed magnetic field distribution in the Region of Interest (ROI) that is largely independent of the shape of the current-carrying surface. We will demonstrate the successful implementation of our approach as well as experimental results. Theory As mentioned above, a cost function Φ can be introduced in the form K Φ = 1 ()() ()− ()+ 2 +α ∑W rk Bz rk Bdes,z rk Boff ,z Wmagn (1) 2 k =1 () () where W r is a weight function, BZ is the z-component of the total field, Bdes,z r as well as Boff,z are the z-components of the desired and offset magnetic field, and α Wmagn is magnetic energy with being a weight coefficient. In (1), the first term denotes the square deviation of the magnetic field from the prescribed field, and the second term is the magnetic energy of the coil. -
Types of Tap
Types of Tap HAND TAPS ISO 529 These are straight flute general purpose tools which can be used for both machine or hand tapping. They are generally the most economical tool for use on production runs, but are best on materials that produce chips, or where the swarf breaks readily. Where deep holes are to be tapped, in materials which produce stringy swarf, serial taps may be needed, especially for coarse threads. ISO 529 hand taps can be supplied in sets of three; bottom, second and taper leads, or individually. BOTTOM TAPS have a chamfer (lead) of 1–2 threads, the angle of the lead being around 18 degrees per side. They are used to produce threads close to the bottom of blind holes. SECOND TAPS have a lead of 3-5 threads at 8 degrees per side. They are the most popular and can be used for through holes, or blind holes where the thread does not need to go right to the bottom. TAPER TAPS have a lead of 7-10 threads at 5 degrees per side. The taper lead distributes the cutting force over a large area, and the taper shape helps the thread to start. They can therefore be used to start a thread prior to use of second or bottom leads, or for through holes. IMPORTANT NOTE ON TERMINOLOGY! In the U.K. bottom taps are often referred to as ‘plugs’. In North America second taps are often referred to as ‘plugs’! This can easily lead to confusion. To avoid problems when ordering it is best to use the terms bottom, second and taper. -
Comprehensive Trip Packing List
Comprehensive Trip Packing List Water Supplies: Safety and Survival Kit continued: - jug filled with good water - signaling mirror - water purification tablets - matches in waterproof container - fire starter sticks Stove: - survival rations or protein bars - burner - extra water purification tablets - base - reflective emergency blanket - fuel canister(s) - packet of salt - grate or reflector oven or portable fireplace - cutting wire (instead of axe) - multi-tool Kitchen Supplies: - small bug spray bottle - pot(s) - bowls Camping Supplies: - cups - tent(s) - cutlery - sleeping mats - paring knife (or 2) - sleeping bags - small cutting board - small folding chairs - dish rag - axe - dish towels - small saw - paper towels - matches - biodegradable soap - toilet paper (in waterproof bag) - FOOD (make a separate list/menu) - bag for garbage - flashlights For each kayak/canoe: - bug spray and/or bug hat/jacket - bailer or water pump - tarps and/or groundsheet - rope - spare straps/rope - sponge - spray skirt (kayaks) or spray deck (canoes) Additional Equipment/Supplies: if paddling in whitewater - GPS tracking device - spare paddle (for canoes) - bear spray or bear bangers - spare paddle, in 2 halves (for kayaks) - water-tight bags - plastic pail (for hanging food in tree) For each person: - ammonia spray bottle (to “mark” your - PFD territory) - paddle - spare zip lock bags (large) - paddle leash - repair kit* - whistle (on PFD) - water bottle Clothes: - pocket knife (in PFD pocket) - sun hat - map(s) in zip lock bag - rain hat (or hood on rain -
Ksenia Anske PO Box 55871 Seattle, WA 98155 [email protected] TUBE
Ksenia Anske PO Box 55871 Seattle, WA 98155 [email protected] TUBE: Trans-Urban Blitz-Express A novel by Ksenia Anske 153,144 words Anske / TUBE / 1 Chapter 1. Red Shoes The train was watching Olesya undress. She thought it shuddered under the carpet, thick purple carpet, felt the shudder through the soles of her shoes, new flats acquired for the tour in a boutique on Tverskaya, a red lacquer pair that cost half of her principal dancer salary, but it was worth it, dammit, it was worth it to spend— There it is again. A dragging laborious stretch ran through the casing of the machine as though it expanded and contracted, rushing out the air with a hiss. Olesya tore up her feet. Her heart thrummed. It can’t be. I’m just— She glanced out the window. They were standing. According to the large electronic clock it was 11:08 A.M. The train wasn’t due to depart for another five minutes. I wish we’d leave already. I don’t know if I can stand any more of this...whatever it is, are they checking the wheels? I hear Americans are never late, not like Russians. For us the concept of time doesn’t exist. I’m the only weirdo, always showing up before practice. Should’ve taken a shot of vodka like Natasha said. Now I’m hearing things that aren’t there. Anske / TUBE / 2 Olesya shook her head and continued to unpack. Her lucky charm—the TUBE toy train locomotive that she nicknamed Trubochka—the present her father gave her the year he died, the token of his memory she carried with her ever since, was already unwrapped and sitting on the foldout table, scuffed and scraped by a decade of life in pockets but still discernably chic for a mere toy, originally painted peachy cream, now faded to the shade of a healed scar. -
Boots and Shoes
COMPILERS NOTES The following is a faithful digitalization of volume VI of F.Y. Golding’s BOOTS AND SHOES. I have taken the liberty of using this original blank page to comment on the material within. Insofar as I was able, I have endeavoured to preserve the original appearance, formatting, kerning, spacing, etc,. of the original work. Sometime, however, this was simply not possible. The typefaces used in the original text are not precisely duplicated in any of the font sets to which I have access. Then too, the spacing between chapter, paragraph, and graphic elements is often inconsistent within the original text. Sometimes a chapter heading will be set an inch and a quarter below the edge of the page, sometime an inch and a half. Sometimes, using a given set of paragraph styles, a page would format almost to the exact word at the bottom margin...and then the next page would run over or come up substantially short. Nevertheless, I have preserved page numbers and the contents of those pages to fairly close extent. Beyond that, nothing has been added or subtracted from the text as it is contained in the original volumes in my possession. It is my fervent hope that this work will help to preserve the Trade and make this invaluable resource more accessible to those students seeking to learn from the past masters. DWFII BOOTS AND SHOES THEIR MAKING MANUFACTURING AND SELLING VOLUME VI BESPOKE BOOTMAKING J. BALL HANDSEWN BOOTMAKING H. ROLLINSON, A.B.S.I. BOOTS AND SHOES THEIR MAKING MANUFACTURE AND SELLING A WORK IN EIGHT VOLUMES DEALING WITH PATTERN CUTTING AND MAKING. -
Book-Matching Legs 1 Diagonally Opposed Legs
Tips & Tricks Switch location of Rotate remaining Book-matching legs 1 diagonally opposed legs. 2 legs 180°. When making a project with four square legs, such as the jewelry chest on page Use riftsawn stock 36, a nice visual touch is to configure the (with diagonal annular rings). legs to display book-matched grain when viewed from any side of the piece. Here’s how to do it: Begin with a square piece of riftsawn stock the length of the legs. It Triangle reference should be twice the thickness of a finished mark leg, plus about 1/4". Draw a triangle on one end, and then rip the piece into quarters to make four individual leg blanks. Using Book-matched Book-matched the triangle as a reference, reconstitute the faces faces pieces back into their original order, and number the ends as shown. Then switch the position of two diagonally placed legs, Share a Slick Tip. Win Cash or a Prize! and rotate the remaining two legs 180°. Awards Send your ideas to: Top Tip award: $250 Woodcraft Gift Card Tips & Tricks, Woodcraft Magazine, Maintaining this relationship of the legs Published illustrated tip: $125 P.O. Box 7020, Parkersburg, WV 26102-7020 on the project will create book-matched Published non-illustrated tip $75 or visit woodcraftmagazine.com and click “contact”. leg grain on each face of the piece. Important: Please include your phone number, as an editor may need to call you if your trick —Geoffrey Noden, Trenton, New Jersey is considered for publication. Published tips become the property of Woodcraft Magazine. -
Work Handbook's
“ WO R K” HA N DBO O KS A S eries of Prac cal M nua s ti a l . Edit d b PA UL N HA L i o W e y . S UCK , Ed tor f ORK . u De cor a i n C ri i ‘VH I T ETV A SH IX G H o s e t o p omp s ng , A PER H A N G IN G PA I N T IN G et c Wi h 9 E . 7 n a v in s P , , t gr g and Dia ram s l s ost f ee l 2 d . s . —g . ; p r , . ontent s . Ou l r a nd Pain s P m l C C o ou t . ig ents . Oi s , D ie s V arnis e s et c . Too s u se b Pa in e s H w t r r , h , l d y t r . o o r m ix Oil Pain s . Dis em e or Te e a Pa in in W i e M t t p p r t g . h t wa s in and De co a in a. C ei in . P t a, R h g r t g l g ain ing oom . Pa e in a, R . Em b e is m en of Wa s a nd i in s p r g oom ll h t ll C e l g . kin n M n din Incl di R E Boot Ma g a d e g . -
2016 FALL ANTIQUE TOOL AUCTION September 24, 2016, 9:30 AM Lions Club 4835 Central School Road St
Great Planes Trading Company Presents 2016 FALL ANTIQUE TOOL AUCTION September 24, 2016, 9:30 AM Lions Club 4835 Central School Road St. Charles (St. Louis), MO 63304 (Preview Friday 2-6 PM, Saturday 7 to 9:30 AM) ______ 1 Two Keen Kutter claw hammers, including K621 with original handle and fine etch, fine overall; and a larger one with Keen Kutter logo on side of head, handle may be original but the end to too dinged up make out a model number, very good overall. ______ 2 Set of 14 Keen Kutter auger bits in original wood box with partial paper label inside. ______ 3 Fine KR10 Keen Kutter ratchet brace, complete with nice nickel and handles. ______ 4 Keen Kutter KK4 1/2C wide smooth plane, complete and fine overall. ______ 5 Keen Kutter K5C iron jack plane, fine tote and knob, very good cutter, very good overall. ______ 6 Keen Kutter lathing hatchet & ratchet brace: KGR10 lathing hatchet with original handle, very good; and a KR10 ratchet brace, complete and very good. ______ 7 Keen Kutter K5 iron jack plane, fine rosewood tote and low knob, very good KK blade, very good overall. ______ 8 FINE Keen Kutter KR10 ratchet brace, perfect nickel and beautiful wood. Looks new. ______ 9 Pair of Keen Kutter iron jack planes K5 & K5C; the K5 is complete and fine; the K5C has the top of the frog broken off along with the lateral lever, it is otherwise complete and still usable. ______ 10 Pair of hand saws including a Simonds 26-inch, both have light rust but will clean to good or better usable condition. -
Tool Shed Number 164 June 2011
NUMBER 164 JUNE 2011 • • • A Journal of Tool Collecting published by CRAFTS of New Jersey • • • A TRIP TO COLONIAL WILLIAMSBURG The Largest Living History Museum By Bob Garay his past fall I took a short a lavish palace where the vacation with my wife to Governor would entertain TWilliamsburg. I had been important guests. It is outfitted there once before back in 1975, with many actual antique fur- but that was in my pre-tool col- nishings of the time and had lecting days. Even so I remem- beautiful gardens to stroll bered it as something special around. As you enter the palace with little shops and bustling the first sight is the arms crowds gathering around activi- arrangement in the front hall. ties going on during the day. The Palace hosted the colony’s This time was going to be quite fashionable society and finest different. Fellow tool collector entertainments. The capital of Hank Allen had given me the Virginia was moved to name and number of CRAFTS Richmond but not before the member and former EAIA first two American governors President Jay Gaynor, who is The only way to tour Williamsburg is a carriage ride. resided in this palace: Patrick director of Historic Trades at Williamsburg. I called Jay and Henry and Thomas Jefferson. he agreed to meet me one day to show me around. We After leaving the palace we strolled down the center entered Williamsburg along the picturesque Colonial of town thru the Palace Green. Off this green I saw the Parkway that was a kaleidoscope of color. -
Fire Before Matches
Fire before matches by David Mead 2020 Sulang Language Data and Working Papers: Topics in Lexicography, no. 34 Sulawesi Language Alliance http://sulang.org/ SulangLexTopics034-v2 LANGUAGES Language of materials : English ABSTRACT In this paper I describe seven methods for making fire employed in Indonesia prior to the introduction of friction matches and lighters. Additional sections address materials used for tinder, the hearth and its construction, some types of torches and lamps that predate the introduction of electricity, and myths about fire making. TABLE OF CONTENTS 1 Introduction; 2 Traditional fire-making methods; 2.1 Flint and steel strike- a-light; 2.2 Bamboo strike-a-light; 2.3 Fire drill; 2.4 Fire saw; 2.5 Fire thong; 2.6 Fire plow; 2.7 Fire piston; 2.8 Transporting fire; 3 Tinder; 4 The hearth; 5 Torches and lamps; 5.1 Palm frond torch; 5.2 Resin torch; 5.3 Candlenut torch; 5.4 Bamboo torch; 5.5 Open-saucer oil lamp; 5.6 Footed bronze oil lamp; 5.7 Multi-spout bronze oil lamp; 5.8 Hurricane lantern; 5.9 Pressurized kerosene lamp; 5.10 Simple kerosene lamp; 5.11 Candle; 5.12 Miscellaneous devices; 6 Legends about fire making; 7 Additional areas for investigation; Appendix: Fire making in Central Sulawesi; References. VERSION HISTORY Version 2 [13 June 2020] Minor edits; ‘candle’ elevated to separate subsection. Version 1 [12 May 2019] © 2019–2020 by David Mead All Rights Reserved Fire before matches by David Mead Down to the time of our grandfathers, and in some country homes of our fathers, lights were started with these crude elements—flint, steel, tinder—and transferred by the sulphur splint; for fifty years ago matches were neither cheap nor common. -
Tools and Their Uses NAVEDTRA 14256
NONRESIDENT TRAINING COURSE June 1992 Tools and Their Uses NAVEDTRA 14256 DISTRIBUTION STATEMENT A : Approved for public release; distribution is unlimited. Although the words “he,” “him,” and “his” are used sparingly in this course to enhance communication, they are not intended to be gender driven or to affront or discriminate against anyone. DISTRIBUTION STATEMENT A : Approved for public release; distribution is unlimited. NAVAL EDUCATION AND TRAINING PROGRAM MANAGEMENT SUPPORT ACTIVITY PENSACOLA, FLORIDA 32559-5000 ERRATA NO. 1 May 1993 Specific Instructions and Errata for Nonresident Training Course TOOLS AND THEIR USES 1. TO OBTAIN CREDIT FOR DELETED QUESTIONS, SHOW THIS ERRATA TO YOUR LOCAL-COURSE ADMINISTRATOR (ESO/SCORER). THE LOCAL COURSE ADMINISTRATOR (ESO/SCORER) IS DIRECTED TO CORRECT THE ANSWER KEY FOR THIS COURSE BY INDICATING THE QUESTIONS DELETED. 2. No attempt has been made to issue corrections for errors in typing, punctuation, etc., which will not affect your ability to answer the question. 3. Assignment Booklet Delete the following questions and write "Deleted" across all four of the boxes for that question: Question Question 2-7 5-43 2-54 5-46 PREFACE By enrolling in this self-study course, you have demonstrated a desire to improve yourself and the Navy. Remember, however, this self-study course is only one part of the total Navy training program. Practical experience, schools, selected reading, and your desire to succeed are also necessary to successfully round out a fully meaningful training program. THE COURSE: This self-study course is organized into subject matter areas, each containing learning objectives to help you determine what you should learn along with text and illustrations to help you understand the information. -
Pew Body Specifications
Page 1 SPECIFICATIONS FOR: 54-US3 SEATS: Upholstered foam seat. Construction to consist of ¾” cabinet grade plywood seat foundation reinforced with wood members running horizontally and continuously along front and back edge of seat for maximum strength and stability. 3” thick, 1.85 lb. density foam glued to seat foundation. Upholstered with choice of fabric. Fabric is tightly stretched using even pneumatic pressure, with edges tucked, folded, and stapled to underseat. BACKS: Contoured 9-ply laminated back. Constructed of ½” center core of cabinet grade plywood, 1/8” cross banding of 68 lb. density hardboard both sides, shaped under heated hydraulic pressure with front and back face to be bookmatched selected specie veneer. Finished with 5/4 solid wood cap rail with a tongue and grove joint securely fastened to back, and a solid wood undercap molding. * Also available with spring seating system (optional). * W Option – 2” wider back available 313 Prospect Street • P. O. Box 217 • New Holland, PA 17557-0217 • 800-648-9663 • FAX (717) 354-2181 email: [email protected] • website: http://www.newhollandwood.com Page 2 SPECIFICATIONS FOR: 54-LS SEATS: Contoured 7-ply laminated seat. Constructed of a 5/8” center core of cabinet grade plywood, 1/8” cross banding of 68 lb. density hardboard both sides, shaped under heated hydraulic pressure with top face to be bookmatched selected specie veneer, underside to be continuous Yorkite material. Finished with a 5/8 solid wood cap rail with a tongue and groove joint securely fastened to back. BACKS: Contoured 9-ply laminated back. Constructed of ½” center core of cabinet grade plywood, 1/8” cross banding of 68 lb.