Patent specification 148,582 . . . improvements in ionic relays
Published by H. M. Stationery Office, Redhill, 1920
- First Edition
- Used
Seller: Jeremy Norman's historyofscience, Novato, CA, U.S.A.Jeremy Norman's historyofscience
AbeBooks seller since January 9, 1999
Condition: Used
£ 3,450.39
Quantity: 1 available
Add to basketItem description from seller
Patent for the Flip-Flop Circuit, the Basis for Electronic Memory Eccles, William Henry (1875-1966) and Frank Wilfred Jordan (1882- ). Patent specification 148,582 . . . improvements in ionic relays. [Redhill: Printed for His Majesty's Stationery Office by Love & Malcomson, Ltd., 1920.] 5pp. Folding plate. Errata slip tipped to first leaf. 267 x 195 mm. Unbound. Light wear along gutter margin and fore-edge, but very good. Stamps of the Belgian Bureau voor den Industrieelen Eigendom Bibliotheek. First Edition. On June 21, 1918 British physicists William Henry Eccles and Frank Wilfred Jordan, professors of engineering at London's City and Guilds Technical College, filed a patent for "Improvements in Ionic Relays"-the first flip-flop circuit. The device, originally called the Eccles-Jordan trigger circuit, consisted of two active elements (vacuum tubes). The schematic drawing illustrating Eccles and Jordan's patent shows two flip-flops, "one drawn as a cascade of amplifiers with a positive feedback path, and the other as a symmetric cross-coupled pair" (Wikipedia). The patent specification, no. 148,582, was first published in 1920. Early flip-flops were known variously as trigger circuits or multivibrators. A flip-flop circuit has two stable states and, as Claude Shannon pointed out in his Mathematical Theory of Communication (1948), can be used to store one bit of information. Flip-flop circuits operate using Boolean algebra (AND, OR, NOT). Prior to the invention of electronic computing Eccles and Jordan viewed their invention as a "method of relaying or magnifying in electrical circuits for use in telegraphy and telephony." However, with the invention of electronic computing that used vacuum tubes as switches, flip-flops became the basic storage element in sequential logic used in digital circuitry, and the basis for electronic memory. In September 1919 Eccles and Jordan described the flip-flop in a brief one-page paper, "A trigger relay utilizing three-electrode thermionic vacuum tubes" (The Electrician, 83, [September 19, 1919], p. 298). However, the patent, filed the previous year and consisting of 5 pages plus illustration, remains the first description of this invention. Very rare. .…
Seller Inventory # 42964
Bibliographic details
- Title
- Patent specification 148,582 . . . improvements in ionic relays
- Author
- Eccles, William Henry and Frank Wilfred Jordan
- Publisher
- H. M. Stationery Office, Redhill
- Publication year
- 1920
- Edition
- 1st Edition
Jeremy Norman's historyofscience
Novato, CA, U.S.A.
Shipping rates within U.S.A.
| Item | 5 to 14 business days | 3 to 6 business days |
|---|---|---|
| First item | £ 7.44 | £ 18.61 |
Payment methods
- Bank Draft
- Bank Wire Transfer
- Money Order
- Paypal
Specialty
Medicine, Science, Technology, Natural History, Autographs, Manuscripts, AppraisalsAssociation member
Seller's business information
Jeremy Norman's historyofscience
P. O. Box 867
Novato, CA U.S.A. 94948
Terms of sale
Shipping charges will be applied to all orders. All items are guaranteed as described and all purchases may
be returned for any reason within two weeks of receipt. Please notify us in advance if you are making a
return.
Legal entity: Jeremy Norman & Co., Inc.
Business address: 936-B Seventh St., PMB 238, Novato, CA 94945-3000
Email address: orders@jnorman.com
Phone: 415-892-3181
Federal Tax ID Number:94-2261335
Authorized representative: Jeremy M. Norman
Right of withdrawal
If you are a consumer you can withdraw from the contract in accordance with the following. Consumer means any natural person who is acting for purposes which are outside his trade, business, craft or profession.
Information regarding the right of withdrawal
Statutory right to withdraw
You have the right to withdraw from this contract within 14 days without giving any reason.
The withdrawal period will expire after 14 days from the day on which you acquire, or a third party other than the carrier and indicated by you acquires, physical possession of the last good or the last lot or piece.
To exercise the right of withdrawal, electronically fill in and submit a clear statement on our website, under "My Purchases" in "My Account". We will communicate to you an acknowledgement of receipt of such a withdrawal on a durable medium (e.g. by e-mail) without delay.
To meet the withdrawal deadline, it is sufficient for you to send your communication concerning your exercise of the right of withdrawal before the withdrawal period has expired.
Effects of withdrawal
If you withdraw from this contract, we will reimburse to you all payments received from you, including the costs of delivery (except for the supplementary costs arising if you chose a type of delivery other than the least expensive type of standard delivery offered by us).
We may make a deduction from the reimbursement for loss in value of any goods supplied, if the loss is the result of unnecessary handling by you.
We will make the reimbursement without undue delay, and not later than 14 days after the day on which we are informed about your decision to withdraw from this contract.
We will make the reimbursement using the same means of payment as you used for the initial transaction, unless you have expressly agreed otherwise; in any event, you will not incur any fees as a result of such reimbursement.
We may withhold reimbursement until we have received the goods back, or you have supplied evidence of having sent back the goods, whichever is the earliest.
You shall send back the goods or hand them over to Jeremy Norman's historyofscience, Novato, California, U.S.A., without undue delay and in any event not later than 14 days from the day on which you communicate your withdrawal from this contract to us. The deadline is met if you send back the goods before the period of 14 days has expired. You will have to bear the direct cost of returning the goods. You are only liable for any diminished value of the goods resulting from the handling other than what is necessary to establish the nature, characteristics and functioning of the goods.
Exceptions to the right of withdrawal
The right of withdrawal does not apply to:
- The delivery of newspapers, journals or magazines with the exception of subscription contracts; and
- The supply of digital content which is not supplied on a tangible medium (e.g. on a CD or DVD) if you accepted when you placed your order that we could start to deliver it, and that you could not withdraw once delivery had started.
Shipping terms
Orders usually ship within 2 business days. Shipping costs are based on books weighing 2.2 LB, or 1 KG. If your book order is heavy or oversized, we may contact you to let you know extra shipping cost is required.