Skip to main content Accessibility help

Menu links

Browse

Subjects

Subjects (A-D)

Subjects (E-K)

Subjects (L-O)

Subjects (P-Z)

Open access

All open access publishing

Journals

Explore

Open access

Collections

Books

Explore

Collections

Cambridge Companions
Cambridge Editions
Cambridge Histories
Cambridge Library Collection
Cambridge Shakespeare
Cambridge Handbooks

Collections (cont.)

Elements

Explore

Subjects (A-E)

Subjects (F-O)

Subjects (P-Z)

Textbooks

Explore

Collections

Book collections

Book collections (cont.)

Journal collections

Series

All series

Partners

Partners

Partners (cont.)

Services

About

About Cambridge Core

Environment and sustainability

Guides

Help

Agents

Services for agents

Authors

Journals

Journals (cont.)

Journals (cont.)

Books

Corporates

Corporates

Editors

Information

Resources

Librarians

Information

Products

Tools

Resources

Peer review

Peer review

Publishing ethics

Journals

Journals (cont.)

Books

Books (cont.)

Publishing partners

Publishing partners

Publishing partners (cont.)

Open research

Open access policies

Open access policies

Journals

Books and Elements

Open access publishing

About open access

Open access resources

Open research initiatives

Research transparency

Journal flips

Flip it Open

Open access funding

Open access funding

Cambridge Open Engage

Cambridge Open Engage

No rock or barley-sugar?

Published online by Cambridge University Press: 22 September 2016

Donald Halfpenny

Show author details

Donald Halfpenny*: Affiliation:
27 Cuckoo Hill, Pinner, Middlesex HA5 2BA

Article contents

Abstract

Rights & Permissions

Abstract

An abstract is not available for this content so a preview has been provided. As you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

Image of the first page of this content. For PDF version, please use the ‘Save PDF’ preceeding this image.'

Information

Type: Correspondence
Information: The Mathematical Gazette , Volume 65 , Issue 434 , December 1981 , pp. 298

DOI: https://doi.org/10.2307/3616610 [Opens in a new window]
Copyright: Copyright © Mathematical Association 1981

To send this article to your Kindle, first ensure no-reply@cambridge.org is added to your Approved Personal Document E-mail List under your Personal Document Settings on the Manage Your Content and Devices page of your Amazon account. Then enter the ‘name’ part of your Kindle email address below. Find out more about sending to your Kindle. Find out more about saving to your Kindle.

Note you can select to save to either the @free.kindle.com or @kindle.com variations. ‘@free.kindle.com’ emails are free but can only be saved to your device when it is connected to wi-fi. ‘@kindle.com’ emails can be delivered even when you are not connected to wi-fi, but note that service fees apply.

Find out more about the Kindle Personal Document Service.

No rock or barley-sugar?

Your Kindle email address

@free.kindle.com @kindle.com (service fees apply)

Available formats PDF

By using this service, you agree that you will only keep content for personal use, and will not openly distribute them via Dropbox, Google Drive or other file sharing services

Reply to: Submit a response

Title * Please enter a title for your response.

Contents * Please enter your response.

Your details

First name * Please enter your first name.

Last name * Please enter your last name.

Please enter a valid email address.

Occupation Please enter your occupation.

Affiliation Please enter any affiliation.

You have entered the maximum number of contributors

Conflicting interests

Do you have any conflicting interests? * Conflicting interests help

Yes No

More information * Please enter details of the conflict of interest or select 'No'.

Please tick the box to confirm you agree to our Terms of use. *

Please accept terms of use.

Please tick the box to confirm you agree that your name, comment and conflicts of interest (if accepted) will be visible on the website and your comment may be printed in the journal at the Editor’s discretion. *

Please confirm you agree that your details will be displayed.